Detailed working notes on the Advanced Air Mobility (AAM) ecosystem covering eVTOL aircraft, vertiports, airspace integration, regulatory frameworks, and the community/environment dimension. This folder expands the summary in topics/aam.md into per-aspect files so each can be read on its own.

Files in this folder#

• overview.md — what AAM is, where it sits in the ICAO/EASA/FAA regulatory landscape, and the relationship to ATM modernization.
• components.md — the five building blocks: vehicle, vertiport, airspace/UTM, certification/regulatory, community/environment.
• blocks.md — maturity phases (Piloted Initial through Autonomous Scale) and market segments (intracity UAM vs. regional AAM).
• threads.md — functional axes: airworthiness/type cert, air operations, vertiport infrastructure, airspace integration, noise/ environment, public acceptance.
• modules.md — anatomy of one strand: eVTOL type certification under EASA SC-VTOL-01, worked from design brief to type certificate.
• enablers.md — CNS infrastructure, procedures, training, regulation, certification, and institutional arrangements that gate AAM deployment.
• performance_objectives.md — KPA matrix, KPIs, and performance frameworks for assessing AAM benefit.
• timeline.md — historical evolution: SC-VTOL-01 (2019), vertiport PTS (2022), FAA ConOps, Innovate28, first type certs.
• references.md — consolidated ICAO and authoritative external references for everything in this folder.

Reading order#

Start with overview.md, then components.md to understand the building blocks, then blocks.md for the phasing logic. Use threads.md for the functional axis view and modules.md for a worked certification example. enablers.md maps what must be in place before AAM can scale. timeline.md gives date context and references.md gives the citation base.

Source basis#

Content is grounded in:

• ICAO Doc 10177 (Manual on Operational Opportunities to Reduce Aircraft Noise), §8.11.
• ICAO Circular 365 (Interim Noise Measurement Guidelines for Smaller ETA, 2026).
• ICAO Doc 10209 (AN-Conf/14 Report, 2022), AAM discussion §2.25-2.27.
• ICAO Assembly Resolution A41-9 (New Entrants policy).
• EASA Special Condition SC-VTOL-01 and MOC SC-VTOL.
• EASA Prototype Technical Specifications for Vertiports (PTS-VPT-DSN, 2022).
• EASA NPA 2024-01 on Innovative Air Mobility.
• FAA Urban Air Mobility ConOps v2.0 (June 2023).
• FAA Innovate28 Implementation Plan.
• ICAO Annex 8 (Airworthiness) and Annex 14 Vol II (Heliports).
• ICAO Annex 16 Vol I (Aircraft Noise), Chapter 13 (tilt-rotor reference).

What AAM is#

Advanced Air Mobility (AAM) is an emerging air transportation system that uses a new generation of aircraft to move people and cargo in markets previously unserved or underserved by conventional aviation. The term covers a spectrum from intracity air taxi services (Urban Air Mobility, or UAM) to regional routes of 50-300 km that connect suburban communities to aviation hubs.

The defining vehicle type is the electric VTOL (eVTOL) aircraft: a multi-rotor or tilt-rotor airframe powered by distributed electric propulsion. Electric motors are individually lighter, more reliable, and software-controllable in ways that turbine engines are not. This enables aircraft configurations that are mechanically new to aviation — vehicles with 6 to 12 independent lift motors, no tail rotor, and no conventional runway requirement.

ICAO Doc 10177 §8.11.1 provides the first formal international-level definition of AAM: a transportation concept that moves people and cargo "between places previously not served or underserved by aviation — local, regional, intraregional, urban, suburban — using revolutionary new aircraft that are only just now becoming possible."

Where AAM sits in the regulatory landscape#

AAM does not yet have a dedicated ICAO SARP framework. The 41st Assembly (A41-9, 2022) directed ICAO to review SARPs for New Entrants including UTM and HAO, and AN-Conf/14 (Doc 10209, 2022) placed AAM on the ICAO work programme, calling for ecosystem assessment before any SARPs development.

The ICAO AAM Study Group, confirmed by the Council in 2024 (Doc 10219), is conducting that ecosystem assessment. Its output will feed the ICAO Standardization Roadmap. Until ICAO-specific provisions exist, AAM operators and regulators rely on interim frameworks:

• ICAO Annex 8 (Airworthiness) for type certification.
• ICAO Annex 14 Vol II (Heliports) for VTOL infrastructure.
• EASA Special Condition SC-VTOL-01 — the most complete eVTOL type certification basis in force anywhere.
• FAA powered-lift rules and UAM ConOps — the US pathway.

How AAM relates to ATM modernization#

AAM does not sit inside the existing ASBU framework — it is not a module in any existing ASBU thread. However, AAM's scaling trajectory makes it progressively more dependent on the same capabilities that ASBU is building:

• UTM/U-space for low-altitude AAM operations is the UAS management layer, but as AAM aircraft grow in altitude and scale, they need ATM integration including ATFM, flight plan filing, and trajectory management.
• SWIM services will underpin the information exchange between UTM providers and ATC for AAM traffic management at scale.
• FF-ICE trajectory exchange will apply once AAM aircraft file IFR and participate in cross-border ATFM.
• ADS-B/ADS-C surveillance will be required for AAM operations in controlled airspace.

The ICAO Assembly (A41-9) explicitly recognised the need for ICAO to provide a global harmonized framework for New Entrants — the framework that ensures UTM-to-ATC interface standards are consistent across states so AAM can operate internationally.

Why AAM is a distinct topic#

AAM is not simply a new aircraft type fitting within existing aviation structures. It introduces simultaneous novelty across every layer of the aviation system:

• Vehicles: novel propulsion, novel failure modes, novel automation.
• Infrastructure: vertiports at urban locations, rooftop pads, rapid-turnaround charging in 5-10 minutes.
• Airspace: high-density low-altitude operations below conventional radar coverage in Class G airspace, managed by UTM automation.
• Certification: no applicable certification standard in force at ICAO level; leading jurisdictions adapting from helicopter and fixed-wing frameworks.
• Community: noise, privacy, visual intrusion, and equity issues in dense urban settings — a political as much as a technical challenge.

The combination of these layers makes AAM a systemic transition, not an incremental operational improvement. That is why the correct regulatory response (as confirmed by AN-Conf/14) is ecosystem assessment and holistic gap analysis before piecemeal SARPs.

References#

• Doc 10177 (Manual on Operational Opportunities to Reduce Aircraft Noise), Chapter 8, §8.11.1 and §8.11.2 — ICAO formal definition of AAM and noise evaluation requirements.
• Doc 10209 (AN-Conf/14 Report, 2022), §2.25–2.27 — Conference endorsement of ecosystem assessment approach; guidance on eVTOL safety risk management (authoritative source — not in local library).
• Doc 10184 (ICAO Assembly, 41st Session), Resolution A41-9 — New Entrants SARPs review directive (authoritative source — not in local library).
• Annex 8 (Airworthiness of Aircraft), Part II, Chapter 1 — type certification framework applicable to eVTOL aircraft in the interim.
• Annex 14 Vol II (Heliports) — VTOL infrastructure certification baseline for vertiports in the interim.
• EASA Special Condition SC-VTOL-01 — leading eVTOL type certification standard (authoritative source — not in local library; see https://www.easa.europa.eu/).
• FAA Urban Air Mobility ConOps v2.0 (June 2023) — FAA AAM operational concept (authoritative source — not in local library; see https://www.faa.gov/air-taxis/).

The five-pillar architecture#

AAM is a system-of-systems. Successful deployment requires five interdependent building blocks to mature in parallel. A gap in any single pillar limits the whole system: a certified aircraft with no vertiport to land on cannot operate; a vertiport with no airspace integration framework creates unacceptable safety risk at scale.

The five pillars are:

• Vehicle / Aircraft
• Vertiport / Ground Infrastructure
• Airspace Integration / UTM
• Certification / Regulatory
• Community / Environment

1. Vehicle / Aircraft#

The dominant vehicle concept is the electric VTOL (eVTOL) aircraft: a multi-rotor or tilt-rotor airframe powered by distributed electric propulsion (DEP). DEP uses multiple independent motor-propeller (or rotor) units, so that no single motor failure degrades safety beyond an acceptable level — a fundamentally different safety architecture from the twin-engine or single-engine designs that ICAO Annex 8 certification was built around.

Sub-categories of eVTOL:

• Multirotor — lift and control entirely from variable-speed rotors, analogous to a large drone. No fixed wing; efficient only at low speeds. Examples: Archer, Joby initial concepts.
• Lift-and-cruise — separate lift rotors for vertical flight, fixed wing for cruise. Higher range efficiency in cruise phase.
• Vectored-thrust / tilt-rotor — rotors or motors rotate to provide both vertical lift and horizontal thrust. Higher cruise efficiency but more complex mechanical design.

Key technical characteristics driving novel certification approaches:

• Battery energy storage: lithium-ion or lithium-polymer cells with thermal management criticality; fire risk and energy density constraints limit range and payload compared to turbine aircraft.
• Full-authority digital flight control: fly-by-wire required; the control laws manage the complex multi-rotor balance. Software assurance is a primary certification challenge.
• Autonomy progression: design intent is to move from single-pilot through single-pilot + automation assistance to fully autonomous operations. Each autonomy level requires a distinct safety case and operational approval.

For regional AAM, hybrid-electric and hydrogen-electric architectures are being developed to extend range beyond the 50-100 km ceiling of pure battery designs, reaching 200-300 km for intercity operations.

2. Vertiport / Ground Infrastructure#

A vertiport is the VTOL-specific ground facility providing landing and take-off areas, parking, charging or fuelling infrastructure, and passenger handling for AAM operations. Vertiports may be:

• Ground-level (analogous to a helipad or small airport);
• Elevated/rooftop (on buildings, parking structures, or elevated platforms in urban areas);
• Off-airport (in city centres, transport hubs, hospital rooftops);
• Airport-integrated (at existing airports or heliports as the AAM long-range terminus).

Design baseline#

ICAO Annex 14 Vol II (Heliports) provides the current regulatory baseline. It defines:

• FATO (Final Approach and Take-Off Area): the defined area over which the final approach manoeuvre is completed and from which take-off commences. Dimensions related to the "design helicopter" (adapted to "design aircraft" for eVTOL).
• TLOF (Touchdown and Lift-Off Area): the load-bearing area within or near the FATO where the aircraft actually lands.
• Obstacle limitation surfaces protecting the approach and departure paths.
• Lighting, marking, and rescue/firefighting requirements.

EASA PTS-VPT-DSN (Issue 1, 2022) supplements Annex 14 Vol II with eVTOL-specific requirements including approach/departure geometry for multirotor aircraft, simultaneous operation scheduling, charging infrastructure, and noise management at community-proximate sites.

FAA Engineering Brief EB-105 provides US engineering guidance for vertiport design pending formal FAA rules.

Key design challenges#

• Simultaneous operations: vertiports must handle multiple concurrent landings and departures safely, requiring precise scheduling and separation of approach/departure paths.
• Rapid turnaround (5-10 minutes target): charging infrastructure at parking positions; battery swap capability in some concepts; passenger boarding/deboarding without full shutdown.
• Fire suppression: eVTOL battery fires require specialised suppression agents and protocols distinct from aviation fuel fires.
• Elevated structures: rooftop vertiports must meet building structural loads; wind environment on rooftops creates turbulence challenges for eVTOL operations.

3. Airspace Integration / UTM#

AAM operations span two fundamentally different airspace management regimes, and the interface between them is the central ATM challenge:

Below controlled airspace: UTM / U-space#

Urban AAM operations are typically planned for altitudes of 100-600 m AGL in Class G (uncontrolled) airspace. At this altitude, traditional ATC radar and voice management cannot scale to hundreds of simultaneous eVTOL flights. UTM (UAS Traffic Management) / U-space (EASA's European implementation) provides the automated, service-based management layer:

• Common Information Service (CIS): shared real-time picture of all flight activities, weather, obstacles, and restrictions.
• Electronic identification and registration: all aircraft broadcast identity and position continuously.
• Geo-awareness: digital geofences enforcing restricted areas, controlled airspace boundaries, and temporary restrictions.
• Flight authorisation: pre-flight route and altitude authorisation through automated services without ATC controller involvement for routine operations.
• Traffic information service (TIS-U): awareness of other vehicles in the vicinity.

Above UTM / in controlled airspace#

As AAM operations grow in scale or altitude (regional AAM, IFR operations), they enter ATC-managed controlled airspace. The UTM-to-ATC interface (U2/U3 service layer in EASA's framework) defines the protocols and data exchange for:

• Transfer of responsibility from UTM to ATC at the airspace boundary.
• Sharing of AAM flight plan information between UTM providers and ATC units via SWIM services.
• ATFM integration for high-density AAM operations at vertiports analogous to airport ATFM.
• ADS-B surveillance for AAM in controlled airspace (Annex 10 standards apply; ADS-B out equipage required).
• FF-ICE trajectory exchange for AAM flights that cross FIR boundaries or require full trajectory management.

4. Certification / Regulatory#

The regulatory building blocks required before AAM can operate commercially:

• Aircraft type certificate: the State of Design issues a Type Certificate confirming compliance with the applicable airworthiness requirements (Annex 8 §1.4.1). For eVTOL this means EASA SC-VTOL-01 (Europe) or FAA powered-lift/special class rules (US). Bilateral validation agreements (BASA/TCCA) determine market access.
• Air operator certificate (AOC) equivalent: operational approval for the AAM operator. EASA NPA 2024-01 proposes adapted rules for IAM/AAM operators including novel pilot training, dispatch, and maintenance requirements for initially piloted eVTOL operations.
• Vertiport certificate: Annex 14 Vol II heliport certification framework; supplemented by EASA PTS-VPT-DSN for vertiport-specific requirements. States must establish competent authorities for vertiport certification.
• Crew licensing: new licence category or rating for novel VTOL aircraft (EASA is developing an eVTOL type rating). Remote pilot station certification for autonomous operations.
• Continuing airworthiness / software updates: eVTOL aircraft rely on frequent software updates to their flight control systems. Regulatory frameworks must address how fleet-wide software changes are approved without full re-certification cycles.

5. Community / Environment#

The non-technical building block without which AAM cannot be deployed at scale in urban areas:

• Noise certification: ICAO Circular 365 (2026) describes CAEP/13 work on noise measurement guidelines for smaller ETA. CAEP/14 is tasked with developing noise certification Standards for larger ETA (AAM). Until those standards exist, operators must demonstrate noise performance against interim methods. ICAO Annex 16 Vol I Chapter 13 (tilt-rotor aircraft) may apply in part to some configurations.
• ICAO balanced approach: Doc 10177 §8.11.2 confirms that AAM noise nuisance should be evaluated using the ICAO balanced approach (noise certification, land-use planning, operational procedures, operating restrictions). Operational measures should be considered early in AAM deployment.
• Local emissions: electric propulsion produces near-zero local emissions at the point of operation. Lifecycle emissions depend on the electricity grid mix. AAM is broadly favourable on local air quality compared to helicopter operations.
• Social licence: community engagement, noise disclosure, equity of benefit distribution (AAM must not serve only affluent users while creating noise impacts on urban communities). Privacy concerns from low-altitude persistent aerial activity.
• Regulatory sandbox programs: AN-Conf/14 (Doc 10209) endorsed States using regulatory sandboxes for real-world data collection to support robust regulatory frameworks.

Component interdependencies (nested hierarchy)#

• Vehicle
  • eVTOL aircraft
    • Multirotor
    • Lift-and-cruise
    • Tilt-rotor / vectored-thrust
  • Hybrid-electric (regional AAM)
  • Hydrogen-electric (future regional AAM)
• Vertiport / ground infrastructure
  • Ground-level
  • Elevated / rooftop
  • Airport-integrated
    • Charging infrastructure
    • RFFS (battery fire protocols)
• Airspace integration / UTM
  • UTM / U-space (below controlled airspace)
    • Common Information Service
    • Flight authorisation
    • Electronic identification
  • UTM-to-ATC interface
  • Controlled airspace (ATC, ATFM, ADS-B)
• Certification / regulatory
  • Aircraft type certificate
  • Air operator certificate
  • Vertiport certificate
  • Crew licensing
  • Software / continuing airworthiness
• Community / environment
  • Noise certification (CAEP/14)
  • ICAO balanced approach
  • Social licence
  • Regulatory sandboxes

References#

• Doc 10177 (Manual on Operational Opportunities to Reduce Aircraft Noise), §8.11.1–8.11.2 — ICAO definition of AAM; noise evaluation using balanced approach.
• ICAO Circular 365 (2026), Background section — classification of AAM as larger Emerging Technology Aircraft; CAEP/14 noise certification work programme (authoritative source — not in local library).
• Doc 10209 (AN-Conf/14 Report, 2022), §2.25–2.27 — AAM ecosystem assessment, eVTOL safety risk guidance, and regulatory sandbox endorsement (authoritative source — not in local library).
• Annex 8 (Airworthiness of Aircraft), Chapter 1, §1.4.1 — Type Certificate issuance framework applicable to eVTOL.
• Annex 14 Vol II (Heliports), Definitions and Chapter 3 — FATO, TLOF, obstacle limitation surfaces, heliport certification requirements.
• EASA SC-VTOL-01 — eVTOL type certification standard covering distributed electric propulsion, battery systems, and autonomy (authoritative source — not in local library; see https://www.easa.europa.eu/).
• EASA PTS-VPT-DSN (Issue 1, 2022) — vertiport design specifications including simultaneous operations, charging infrastructure, noise management (authoritative source — not in local library).
• EASA NPA 2024-01 — proposed air operations rules for initially piloted AAM/IAM services (authoritative source — not in local library).
• FAA Engineering Brief EB-105 — US vertiport design guidance (authoritative source — not in local library; see https://www.faa.gov/airports/).

What an AAM "Block" represents#

Unlike the ASBU framework's time-phased blocks tied to global SARPs maturity dates, AAM maturity blocks represent the progression of operational capability from initial restricted piloted operations to fully autonomous scaled services. They are not globally synchronized by a single ICAO availability date; rather, each jurisdiction moves through the blocks at its own pace, constrained by regulatory approvals, fleet availability, and public acceptance.

The four maturity blocks below are derived from the FAA UAM ConOps v2.0, the EASA NPA 2024-01 phasing, and the broader industry roadmap. Each block has distinct characteristics in terms of automation level, operational scope, regulatory requirements, and expected fleet size.

The four maturity blocks#

Block 1 — Piloted Trials (2019-2026)#

Theme. Prove the vehicle, obtain the first type certificates, stand up the first commercial services on limited routes. Automation assists the pilot but the pilot is fully responsible for all flight phases. Operations are restricted in scope (approved corridors, visual meteorological conditions (VMC), daylight only initially).

Regulatory status. EASA issued SC-VTOL-01 in 2019. First type certificate applications were filed 2020-2022 by Joby Aviation, Archer, Lilium, Wisk, and others. FAA issued powered-lift category rules (2023) to enable US type certification. EASA granted some Design Organisation Approvals to eVTOL manufacturers.

Operations. Air taxi demonstrations began in multiple cities. Volocopter operated commercial demonstration flights in Dubai, Singapore, and other cities. Lilium conducted flight trials (company later filed for insolvency; aircraft programme subsequently restructured). Joby and Archer advanced toward FAA type certificate.

Infrastructure. First purpose-designed vertiports constructed (Dallas, Miami, Los Angeles, Dubai). Airport authorities including Heathrow and Singapore Changi began vertiport planning.

Key constraints. Battery energy density; eVTOL range (typically 50-100 km); noise at urban sites; absence of full regulatory framework for operations; insurance market underdeveloped.

Block 2 — Piloted Scale (2026-2030)#

Theme. Commercial launch with first type-certificated aircraft. Vertiport networks established in early-adopter cities. Piloted operations but with VTOL-specific training and type ratings. Regulatory frameworks for operations (equivalent of AOC) in place in lead jurisdictions. UTM/U-space operational in Europe and the US.

Regulatory status. EASA NPA 2024-01 on IAM operations expected to produce final rules in this block. FAA Innovate28 initiative targets scaled AAM operations by the 2028 Los Angeles Olympics. ICAO AAM ecosystem assessment and gap analysis expected to produce SARP development roadmap.

Operations. Commercial scheduled air taxi services on high-demand urban corridors. Point-to-point vertiport-to-airport routes. Fleet sizes of 10-100 aircraft per operator in mature markets.

ATM integration. UTM/U-space handles low-altitude operations. Higher-altitude AAM routes (IFR flights connecting vertiports to airports) interact with ATC. SWIM-based information exchange between UTM providers and ATC operational.

Block 3 — Highly Automated (2030-2035)#

Theme. Automation handles routine flight phases; single-pilot required but workload reduced. Optional remote pilot station support for certain operations. IFR operations in controlled airspace normalized. Fleet sizes of hundreds per operator in leading markets.

Regulatory requirements. Remote pilot station type certification. Single-pilot rules for eVTOL (adapted from single-pilot commercial operations rules). ATFM integration for high-density vertiport operations. ADS-B Out mandatory for all IFR AAM aircraft.

ATM integration. FF-ICE trajectory exchange for cross-border AAM routes. ATFM managing vertiport congestion analogously to airport ATFM. Surveillance via ADS-B and cooperative MLAT in UTM layer.

Block 4 — Autonomous Scale (2035+)#

Theme. Fully autonomous operations without onboard pilot. Remote flight supervision from a ground-based operations centre monitoring multiple aircraft simultaneously. Operations scaled across metropolitan regions and inter-city routes.

Regulatory requirements. Full autonomous operation SARPs from ICAO (outcome of AAM Study Group and Standardization Roadmap). Remote pilot station certification. System safety analysis of fleet- level autonomy including software assurance at DAL A (Design Assurance Level A). Liability and insurance frameworks for autonomous aircraft accidents.

ATM integration. Seamless UTM-to-ATC interface at every altitude. Automated conflict resolution replacing controller interventions for routine events. ICAO has yet to develop provisions for automated air-ground trajectory synchronisation for autonomous AAM — this is an open SARP development item.

Market segments#

AAM is not a single market. Two broad segments have distinct operational and regulatory characteristics:

Intracity / UAM#

• Range: 15-80 km
• Mission: urban air taxi, hospital-to-hospital, airport-to-city- centre, event transport
• Vehicle type: multirotor or compact lift-and-cruise eVTOL
• Vertiport density: high (many vertiports in a metropolitan area)
• Altitude: 100-600 m AGL (below controlled airspace in most cases)
• ATM layer: primarily UTM/U-space; ATC only at airport vertiports
• Key constraint: noise at urban sites; community acceptance; cost vs. ground taxi per km

Regional AAM#

• Range: 80-300 km
• Mission: suburban-to-hub, intercity, cargo, medical supply chain
• Vehicle type: larger lift-and-cruise, tilt-rotor, or hybrid-electric
• Vertiport density: lower (hub-and-spoke model)
• Altitude: typically IFR altitudes (1,000-10,000 ft) using controlled airspace
• ATM layer: full ATC and ATFM integration; FF-ICE for cross-border
• Key constraint: battery range (hybrid/hydrogen needed); IFR operations approval; pilot training for IFR VTOL operations

References#

• FAA Urban Air Mobility ConOps v2.0 (June 2023) — phasing of UAM operations from piloted through autonomous (authoritative source — not in local library; see https://www.faa.gov/air-taxis/).
• EASA NPA 2024-01 (Innovative Air Mobility Operations) — proposed operational phases and approval criteria for initially piloted AAM services (authoritative source — not in local library).
• EASA SC-VTOL-01 — type certification basis controlling entry into Block 1 and Block 2 (authoritative source — not in local library; see https://www.easa.europa.eu/).
• FAA Innovate28 Implementation Plan — Block 2 milestone framework for the 2028 target date (authoritative source — not in local library; see https://www.faa.gov/air-taxis/innovate28).
• Doc 10209 (AN-Conf/14 Report, 2022), §2.26 — ICAO holistic approach to AAM; ecosystem assessment before SARPs (authoritative source — not in local library).

What a thread represents in AAM#

In the ASBU framework, a thread is a functional axis grouping related operational improvements. For AAM — which has no ASBU thread of its own — the equivalent concept is a set of functional work streams, each of which must advance in parallel to enable the overall AAM ecosystem. The six threads below map to the primary functional axes identified by ICAO, EASA, and FAA in their respective AAM work programmes.

Thread 1 — Airworthiness / Type Certification#

Function. Establish that an eVTOL aircraft design meets the applicable airworthiness requirements and issue a Type Certificate (TC) permitting manufacture and registration of production aircraft.

ICAO basis. Annex 8 (Airworthiness of Aircraft) Part II, Chapter 1: type certification framework. §1.4.1 requires the State of Design to issue a TC upon satisfactory evidence of compliance. §1.4.2 requires other contracting states issuing their own TC to base it on compliance evidence. Applicable "appropriate airworthiness requirements" for eVTOL are adapted from CS-25/CS-27 (EASA) or FAR Part 25/27 (FAA) via special conditions.

EASA. SC-VTOL-01 is the current basis. Key certification areas within SC-VTOL-01: (a) structural integrity and loads; (b) propulsion system — electric motor reliability, battery energy management, thermal runaway containment; (c) flight control system — full- authority fly-by-wire assurance at DAL A; (d) emergency landing capability — minimum glide or controlled descent on full power failure; (e) occupant safety — crashworthiness, emergency egress.

FAA. The FAA published powered-lift certification basis rules (2023) enabling Part 21 Special Class type certification for eVTOL. Joby Aviation, Archer, and Wisk are in active FAA certification.

Open items. Battery certification standards (thermal runaway propagation containment); autonomous flight control system certification (no pilot-in-the-loop safety barrier); bilateral validation of EASA TCs by FAA and vice versa (BASA validation process); ICAO recognition of national TCs under Annex 8 bilateral validation arrangements.

Thread 2 — Air Operations / Operational Approval#

Function. Establish the operational requirements for commercial AAM services: operating rules, pilot licensing, training, dispatch, maintenance, and safety management.

ICAO basis. Annex 6 (Operation of Aircraft) applies broadly; however, no eVTOL-specific operations provisions exist at ICAO level. Annex 1 (Personnel Licensing) does not yet include an eVTOL type rating. The ICAO AAM Study Group is scoping the gaps.

EASA. NPA 2024-01 (Innovative Air Mobility Operations) proposes an AAM/IAM operations regulation covering: (a) operator certificate (IAM-equivalent of AOC); (b) initial single-pilot type rating for eVTOL; (c) minimum rest and duty requirements adapted for short- cycle urban operations; (d) remote pilot station operations for future autonomous flights; (e) performance-based navigation requirements for eVTOL instrument approaches to vertiports.

FAA. Existing FAR Part 135 (on-demand air carrier) is the initial regulatory vehicle for US eVTOL commercial operations, supplemented by policy guidance for novel aspects. FAA Innovate28 is driving acceleration of the operational approval framework.

Open items. Crew licensing mutual recognition across borders; rules for autonomous operations (no pilot onboard); maintenance programme approval for software-intensive eVTOL; ICAO provisions for eVTOL pilot licensing under Annex 1.

Thread 3 — Vertiport Infrastructure#

Function. Design, certify, and operate the ground infrastructure for VTOL aircraft operations in urban and regional settings.

ICAO basis. Annex 14 Vol II (Heliports) is the current ICAO baseline. It establishes: FATO and TLOF dimensions; obstacle limitation surfaces and sectors; lighting, marking, and visual aid requirements; heliport certification (§1.4); safety management system requirements under Annex 19. The Heliport Manual (Doc 9261) provides supplementary guidance on design helicopter selection, certification process, and structural loading — all of which need adaptation for eVTOL.

EASA. PTS-VPT-DSN (Prototype Technical Specifications for Vertiports, Issue 1, 2022): the first dedicated vertiport design specification. Covers approach/departure geometry for VTOL aircraft (non-runway-type FATO); obstacle-free sectors; simultaneous operations procedures; charging infrastructure integration; firefighting for battery fires; noise management.

FAA. Engineering Brief EB-105 provides interim vertiport design guidance for US projects. FAA Advisory Circular update anticipated to replace EB-105 as operations scale.

Open items. ICAO vertiport standards (a formal amendment to Annex 14 Vol II or a new annex volume is under discussion); structural loading standards for rooftop vertiports on existing buildings; emergency response standards for eVTOL battery fires at public facilities; integration of vertiport slots/schedules with ATC flow management.

Thread 4 — Airspace Integration / UTM#

Function. Manage AAM traffic safely and efficiently across both low-altitude uncontrolled airspace (using UTM/U-space) and conventional ATC-managed airspace, and define the interface between the two.

ICAO basis. ICAO Annex 2 (Rules of the Air) and Annex 11 (Air Traffic Services) apply to all aircraft including AAM in controlled airspace. Assembly Resolution A41-9 directs ICAO to review SARPs for UTM integration. AN-Conf/14 (Doc 10209, §2.21) noted ongoing work on UTM and called for content of AAM working papers to be referred to appropriate expert groups.

EASA (U-space). EU Regulation 2021/664 on the U-space regulatory framework establishes U-space as a set of services enabling safe operations of UAS and eVTOL in U-space airspace. Four service levels (U1-U4) with increasing capability. The UTM-to-ATC interface is addressed in Commission Implementing Regulation 2021/665.

FAA (UTM). FAA UTM ConOps and the Low Altitude Authorization and Notification Capability (LAANC) system provide the US baseline. The FAA UAM ConOps v2.0 (2023) describes the architecture for AAM- specific UTM services (corridors, vertiport operations, conflict management).

Open items. ICAO global UTM framework (harmonized interface standards for cross-border UTM); ADS-B requirements for low-altitude AAM in Class G airspace; performance-based navigation specifications for eVTOL instrument approaches; ATFM integration for vertiport congestion management; SWIM services for UTM-ATC information exchange at scale.

Thread 5 — Noise / Environment#

Function. Develop noise certification standards and operational noise management frameworks for AAM aircraft operating in urban environments.

ICAO basis. Annex 16 Vol I (Aircraft Noise): Chapter 13 covers tilt-rotor aircraft and provides the nearest current reference for some eVTOL configurations. ICAO Circular 365 (2026) addresses smaller ETA (UAS) noise measurement; its background section confirms that noise certification Standards for larger ETA (AAM) are a CAEP/14 work item. Doc 10177 §8.11.2 confirms the ICAO balanced approach applies to AAM noise and notes that noise impacts "may be dispersed to a wider area away from airports towards more urban areas than for traditional aircraft."

EASA. Noise guidelines for eVTOL published as interim measures pending Annex 16 standards. Focus on noise footprint at vertiport sites and on populated overflight paths.

FAA. Noise tests conducted under existing Part 36 framework adapted for eVTOL test campaigns. Innovate28 includes community noise engagement requirements.

Open items. Annex 16 Vol I new chapter for larger ETA (CAEP/14 deliverable); noise limits (currently "Reserved" in Circular 365 for smaller ETA and similarly unresolved for larger ETA); noise certification test procedures for multirotor configurations; noise abatement procedure design for vertiport approach/departure profiles.

Thread 6 — Public Acceptance#

Function. Achieve and sustain the social licence that enables AAM operations in populated urban environments.

ICAO basis. AN-Conf/14 (Doc 10209) endorsed the importance of public awareness and engagement programmes related to AAM to address social acceptance considerations. It also supported regulatory sandboxes for real-world data collection. Doc 10183 (41st Assembly Technical Commission) recorded that the Committee agreed ICAO is well positioned to facilitate the engagement of relevant stakeholders on urban air mobility.

Key issues.

• Noise at community-proximate sites and over populated overflight routes.
• Privacy: low-altitude aerial vehicles equipped with cameras and sensors flying over residential areas.
• Equitable access: demonstrating that AAM benefits communities beyond high-income users; first/last-mile integration with public transport.
• Visual intrusion: persistent low-altitude flight activity changes the urban skyline in ways some communities may oppose.

Industry response. Most AAM operators have established community engagement programmes. ICCAIA and ACI submitted working papers to the 41st Assembly requesting ICAO to convene stakeholder engagement processes on urban air mobility governance at all levels.

References#

• Annex 8 (Airworthiness of Aircraft), Part II, Chapter 1, §1.4.1 and §1.4.2 — type certificate issuance and validation between States.
• Annex 14 Vol II (Heliports), Chapter 1, §1.4 — heliport certification; FATO and TLOF definitions applicable to vertiports.
• Doc 10177 (Environment Manual), Chapter 8, §8.11.2 — ICAO balanced approach and noise dispersion for AAM.
• ICAO Circular 365 (2026), Summary and Background sections — classification of AAM as larger ETA; CAEP/14 noise certification task (authoritative source — not in local library).
• Doc 10209 (AN-Conf/14 Report), §2.21, §2.25–2.27 — UTM/AAM ecosystem assessment; social acceptance; regulatory sandboxes (authoritative source — not in local library).
• Doc 10183 (41st Assembly Technical Commission Report), §23.8 — ICAO stakeholder engagement on UAM (authoritative source — not in local library).
• EASA SC-VTOL-01 — airworthiness thread basis (authoritative source — not in local library; see https://www.easa.europa.eu/).
• EASA PTS-VPT-DSN (2022) — vertiport infrastructure thread basis (authoritative source — not in local library).
• EASA NPA 2024-01 — air operations thread basis (authoritative source — not in local library).
• FAA UAM ConOps v2.0 (2023) — airspace integration / UTM thread basis (authoritative source — not in local library; see https://www.faa.gov/air-taxis/).

What a module represents in AAM#

For ASBU, a module is the intersection of a Block and a Thread — the smallest deliverable planning unit. For AAM, the equivalent is a "certification strand": a specific regulatory approval milestone at the intersection of a maturity block and a functional thread.

This file works through one complete certification strand in detail: the type certification of an eVTOL aircraft under EASA SC-VTOL-01, from the manufacturer's design brief to the issuance of a Type Certificate and its validation by a second authority.

Anatomy of an AAM certification strand#

Every AAM certification strand has the following structured elements:

1. Operational objective#

What the certification strand enables operationally. For the eVTOL type certification strand: "A commercially manufactured eVTOL aircraft can be placed on the register of Contracting States that have accepted the Type Certificate, operated by licensed crew under an approved AOC equivalent, and carry paying passengers."

2. Regulatory basis#

Which instruments define the requirements. For eVTOL type cert:

• ICAO Annex 8 (Airworthiness), Chapter 1: type certification framework and bilateral validation obligations.
• EASA Special Condition SC-VTOL-01: the detailed airworthiness requirements for VTOL-capable passenger-carrying aircraft.
• EASA Means of Compliance (MOC SC-VTOL): accepted means of showing compliance with SC-VTOL-01 requirements.

3. Process element#

The structured regulatory process from application to TC issuance.

4. Technical element#

The specific engineering safety case and testing required.

5. Human performance element#

Training, licensing, and human-machine interface requirements.

6. Dependencies#

What must be in place before the strand can be completed or before its output can be used operationally.

Worked Example — EASA eVTOL Type Certification under SC-VTOL-01#

Scenario#

A new eVTOL manufacturer has developed a five-seat lift-and-cruise aircraft with eight lift rotors and two cruise propellers, powered by a 200 kWh battery pack. The company wishes to obtain EASA type certification (with subsequent FAA validation under the BASA) to enable commercial air taxi operations in Europe and the US.

1. Operational objective#

Obtain an EASA Type Certificate (TC) for the aircraft under SC-VTOL-01 Enhanced Category, enabling production and registration of conforming aircraft for commercial operations by approved IAM/AAM operators.

2. Regulatory basis#

• EASA SC-VTOL-01, Enhanced Category: applicable to VTOL-capable aircraft intended to transport passengers in commercial operations. Enhanced Category has higher airworthiness standards than Basic Category (which applies to non-commercial or recreational use).
• MOC SC-VTOL: acceptable means of compliance accepted by EASA, addressing specific SC-VTOL-01 provisions.
• ICAO Annex 8, Chapter 1, §1.4.1: EASA as the competent authority acting on behalf of EU Member States issues the TC as the State of Design's designated authority.

3. Process (from application to TC)#

Step 1: Pre-application engagement. The manufacturer opens a Type Certification Project with EASA, identifying the certification basis (SC-VTOL-01 Enhanced; applicable Certification Specifications; relevant Special Conditions for novel features). EASA assigns a Certification Manager.

Step 2: Certification programme. The manufacturer submits a Certification Programme document describing all compliance showings against every SC-VTOL-01 requirement. EASA reviews and approves the programme as the agreed basis for the certification project.

Step 3: Design Organisation Approval (DOA). The manufacturer obtains or holds an EASA Part-21 Subpart J DOA, allowing it to self-certify compliance findings subject to EASA oversight. DOA privileges reduce EASA's direct involvement in routine compliance findings.

Step 4: Compliance showing (parallel workstreams).

• Structural integrity: loads analysis, finite element modelling, fatigue testing of primary structure, crash landing simulation. Tests at full-scale test articles as required by SC-VTOL-01.
• Propulsion and energy: battery cell and pack characterisation; thermal runaway propagation test (SC-VTOL-01 requires containment so that battery thermal runaway does not endanger occupants); electric motor reliability analysis; power management architecture functional hazard assessment.
• Flight control system (FCS): the fly-by-wire FCS is certified at Design Assurance Level A (DAL A — most critical, equivalent to no failure permitted at catastrophic level). Software assurance follows RTCA/EUROCAE DO-178C. Hardware assurance follows DO-254. Fault injection testing confirms fail-safe transitions.
• Performance: flight test campaign demonstrating compliance with all SC-VTOL-01 performance requirements — vertical take-off, transition, cruise, and landing performance margins; emergency descent capability on full power failure; autorotation or controlled glide (where applicable to design).
• Noise: flight test measurement of approach, departure, and hover noise. Compliance claimed against nearest applicable Annex 16 standard (Chapter 13 tilt-rotor, adapted) or under interim EASA noise method pending CAEP/14 standard.
• Emergency systems: ditching provisions; passenger egress; fire suppression in battery compartment; emergency locator transmitter (ELT) per Annex 10.

Step 5: EASA compliance review and TC issuance. EASA performs Stage of Involvement reviews at key milestones. Upon receipt of all compliance documents and closure of all open findings, EASA issues the Type Certificate. The TC includes the Type Design definition, the Type Certificate Data Sheet (TCDS), and any operating limitations.

Step 6: FAA validation under BASA. Under the US-EU Bilateral Aviation Safety Agreement (BASA), the FAA conducts a validation of the EASA TC. The FAA reviews the certification basis and EASA's compliance findings. For novel aspects without a clear FAA equivalent to SC-VTOL-01, the FAA issues its own Issue Paper / Special Conditions. Validation culminates in a FAA supplemental TC or type certificate acceptance, enabling production for the US market.

4. Technical element (key novel aspects)#

Battery thermal runaway containment. SC-VTOL-01 requires that a thermal runaway event in one battery cell does not propagate to adjacent cells in a manner that endangers occupants. This is shown through abuse testing (nail penetration, overcharge, external heat) at cell, module, and pack level, combined with thermal propagation analysis.

Distributed propulsion failure modes. The safety architecture relies on no single motor failure causing a catastrophic outcome. The manufacturer must show by functional hazard assessment and fault tree analysis that the probability of loss of control due to any single motor failure is below 10^-9 per flight hour (catastrophic failure condition). Common-cause failure modes (wiring harness, power bus, battery management system) require specific analysis.

Fly-by-wire flight control at DAL A. A multirotor eVTOL has no aerodynamic self-stability — the FCS is always active. DAL A software requires formal methods verification, unit testing, integration testing, and hardware-in-the-loop simulation. The manufacturer must demonstrate that no single software failure causes loss of control.

5. Human performance element#

Pilot type rating. Once the TC is issued, EASA develops an eVTOL Type Rating Training Program (TRTP) in coordination with the manufacturer and approved training organisations. The TRTP must address novel aspects: no throttle management; fly-by-wire tactile feedback; battery state monitoring; emergency procedures for motor failure; transition from vertical to horizontal flight.

Flight crew interface. The cockpit and pilot-vehicle interface (PVI) must support situation awareness for: battery state of charge (remaining energy in minutes vs. percentages); motor health status; automated mode engagement/disengagement cues; degraded mode performance (reduced lift margin after motor failure).

6. Dependencies#

Before the TC can be operationally used:

• Air operator certificate equivalent issued by national CAA.
• Vertiport certification at operating bases (Annex 14 Vol II / EASA PTS-VPT-DSN).
• Airspace authorisation and UTM/U-space service activated for operating corridors.
• Pilot type rating programme approved and initial cadre trained.
• Maintenance organisation approval (MOA) for the production aircraft held by approved MRO.
• Insurance market coverage for novel risk profile.

How this strand connects to the maturity blocks#

• The TC process sits in Block 1 (Piloted Trials) and is the gate to enter Block 2 (Piloted Scale). Without a TC, no production aircraft can be sold and no commercial service can begin.
• The BASA validation process connects to the global regulatory network; its completion is a prerequisite for market access beyond the certifying jurisdiction.
• Future autonomous operations (Block 3/4) will require a separate certification strand for the Remote Pilot Station and automated flight control without onboard crew, building on but distinct from the initial piloted TC.

References#

• Annex 8 (Airworthiness of Aircraft), Part II, Chapter 1, §1.4.1 — TC issuance framework; §1.3.5 — design modifications and repair approval basis.
• EASA SC-VTOL-01 — specific airworthiness requirements for VTOL-capable passenger aircraft; battery, propulsion, FCS, performance, emergency systems (authoritative source — not in local library; see https://www.easa.europa.eu/).
• EASA MOC SC-VTOL — acceptable means of compliance with SC-VTOL-01 requirements (authoritative source — not in local library).
• EASA NPA 2024-01 — proposed operational approval rules building on the SC-VTOL-01 type certificate (authoritative source — not in local library).
• FAA Innovate28 Implementation Plan — US timeline for FAA validation of EASA eVTOL TCs (authoritative source — not in local library; see https://www.faa.gov/air-taxis/innovate28).
• Doc 10209 (AN-Conf/14 Report), §2.25-2.26 — Conference support for eVTOL certification development; note on hazard identification and safety risk management guidance (authoritative source — not in local library).

The enabler chain#

An AAM operation cannot happen without all five enabling domains being active simultaneously. Unlike a gradual ASBU block upgrade where a state deploys capability incrementally, AAM requires a minimum viable ecosystem: a certified aircraft, a certified vertiport, an airspace authorization, a licensed pilot, and an operational rule set must all be in place before the first revenue flight. This simultaneity requirement is the primary reason AAM deployment is complex to coordinate.

The enabler domains below map to the five functional threads. Each domain has a minimum viable floor (what must be present for initial operations) and a scaled floor (what must be present for commercial network scale).

1. CNS Infrastructure Enablers#

Communications#

• Voice (ATC): standard VHF radio required for AAM aircraft operating in controlled airspace. Existing provision.
• Digital datalink: as AAM moves toward autonomous operations, Command and Control (C2) links replace cockpit radio. C2 links must satisfy reliability, availability, and latency requirements defined by the type certification. Spectrum allocation for AAM C2 links is a regulatory coordination item (ICAO ICNSS Task Force, referenced in AN-Conf/14 agenda).
• Network (UTM): 4G/5G LTE cellular is the expected primary communication medium for UTM services in urban areas. Redundancy with satellite link required where cellular coverage is unavailable.

Navigation#

• GNSS: GNSS (GPS/Galileo/GLONASS/BeiDou) provides the primary position source for eVTOL. Integrity monitoring (SBAS/GBAS or RAIM) required for precision approach to vertiports, particularly elevated rooftop locations with obstructed satellite geometry.
• Urban canyon effects: GNSS multipath and signal blocking in dense urban environments is a specific challenge not present at conventional airports. Backup navigation (inertial, visual, LIDAR) may be required for final approach phases in urban settings.
• Vertiport approach procedures: PBN approach procedures or point-in-space (PinS) approaches (as used for helicopters under Annex 14 Vol II) adapted for vertiports. EASA PTS-VPT-DSN defines approach geometry; procedure design awaits regulatory guidance analogous to PANS-OPS for heliports.

Surveillance#

• ADS-B Out: required for AAM aircraft in ATC-managed airspace. Annex 10 and Annex 11 provisions apply. For low-altitude UTM operations in Class G, ADS-B out may be mandated by national regulation (FAA B4UFLY / LAANC framework; EU U-space Reg 2021/664).
• Remote Identification (Remote ID): mandated for UAS and expected for AAM: continuous broadcast of identity, position, and operator information. EASA Delegated Regulation 2019/945 establishes Remote ID for UAS; adaptation for eVTOL expected.
• UTM surveillance: the Common Information Service (CIS) in U-space aggregates position reports from all AAM aircraft and UAS in the volume, providing the surveillance picture for the UTM services provider.
• ATC radar: for AAM operations in controlled airspace, conventional SSR Mode S or ADS-B secondary radar provides the controller's surveillance picture.

2. Vertiport / Infrastructure Enablers#

• FATO/TLOF design: per Annex 14 Vol II and EASA PTS-VPT-DSN; dimensions determined by the design aircraft's rotor diameter and performance characteristics.
• Obstacle limitation surfaces (OLS): clearance of obstacles in the approach and departure paths. More complex than conventional heliport OLS because urban environments have many tall structures. EASA PTS-VPT-DSN adapts the Annex 14 Vol II OLS surfaces for vertiports.
• Charging infrastructure: direct current (DC) fast charging at each landing position. Target: 80% charge in under 10 minutes for commercial turnaround. Grid connection capacity at the vertiport site is a significant infrastructure investment.
• Rescue and firefighting (RFFS): eVTOL battery fires require specialised suppression (large volumes of water or chemical agents for lithium-ion fires). RFFS category and response times must be defined by national competent authorities analogous to Annex 14 Vol I RFFS categories for aerodromes.
• Passenger handling: security screening, boarding, deboarding in 2-5 minute windows. Integration with urban transport networks (ride-share apps, public transit connections at vertiport sites).

3. Procedural Enablers#

• Approach and departure procedures: instrument approach procedures to vertiports (for IFR operations). Procedure design follows PANS-OPS (Doc 8168) methodology adapted for VTOL aircraft. PinS (Point-in-Space) approach procedures used for helicopter heliports provide the closest existing model.
• Separation standards: AAM aircraft in controlled airspace must be separated from other aircraft under ATC. Existing separation minima (horizontal and vertical) from PANS-ATM (Doc 4444) apply. New separation standards for UTM-managed airspace are needed where AAM and conventional IFR aircraft share low-altitude Class D airspace.
• UTM operational procedures: flight authorisation processes, conflict management protocols, contingency procedures (e.g., on loss of C2 link), emergency communications, rerouting within UTM.
• Emergency procedures: loss of battery charge inflight; single motor failure; FCS degraded mode; forced landing at non-vertiport locations. Emergency landing sites (flat-roof buildings, parks, highways) must be identified and procedures defined.

4. Training and Human Performance Enablers#

• Pilot type rating: EASA and FAA are developing eVTOL type rating requirements. Novel training areas: fly-by-wire system management; battery state monitoring; motor failure recognition and handling; VTOL-specific emergency procedures; transition between vertical and horizontal flight; vertiport operations including simultaneous approach/departure.
• Air traffic controller training: controllers handling AAM aircraft in controlled airspace require training in eVTOL performance characteristics (different climb/descent rates than fixed-wing or helicopter), battery energy management awareness, and UTM-to-ATC handover procedures.
• UTM operator training: UTM service providers managing automated AAM traffic need training in the operational limits of U-space automation, conflict escalation procedures, and coordination with ATC.
• Ground crew and maintenance training: novel maintenance requirements for high-voltage electrical systems, battery inspection and handling, and fly-by-wire system maintenance. ICAO Annex 1 and PANS-TRG (Doc 9868) provide the framework for maintenance training — extensions for eVTOL maintenance are needed.

5. Regulatory and Institutional Enablers#

• National CAA capability: CAAs must build capability to type-certify or validate eVTOL aircraft, certify vertiports, and issue operational approvals. Most CAAs outside EASA and FAA jurisdictions will use bilateral validation processes to rely on EASA or FAA TCs.
• Bilateral aviation safety agreements (BASAs): for global AAM market access, bilateral TC validation between EASA, FAA, TCCA, CAAS, CAAC, and other aviation authorities is required. ICAO Annex 8 §1.4.2 provides the framework.
• UTM regulatory framework: national legislation authorising UTM/U-space as a recognised air navigation service or traffic management service. EU Regulation 2021/664 provides the European model; other regions need equivalent frameworks.
• Privacy and data governance: UTM requires persistent position tracking and broadcasting of all AAM aircraft. National data privacy frameworks must address the regulatory scope of this surveillance.
• ICAO standards development: the ICAO AAM Study Group outcome (expected to feed the Standardization Roadmap) will determine the priority and timeline for new SARPs in Annex 8, Annex 14, Annex 1, and potentially a new Annex or Doc addressing AAM operations and UTM.

Enabler dependency summary#

References#

• Annex 8 (Airworthiness of Aircraft), Chapter 1 — type certification enablers and bilateral validation framework.
• Annex 14 Vol II (Heliports), Chapters 1, 3, 5 — vertiport infrastructure enablers (FATO/TLOF design, OLS, certification).
• Annex 14 Vol II (Heliports), §1.4.3 — heliport certification process and heliport manual requirement.
• ICAO PANS-TRG (Doc 9868) — maintenance training framework applicable to eVTOL maintenance personnel.
• EASA PTS-VPT-DSN (Issue 1, 2022) — vertiport infrastructure and RFFS enablers (authoritative source — not in local library).
• EASA SC-VTOL-01 — CNS and avionics requirements within the type certification (authoritative source — not in local library).
• EASA NPA 2024-01 — training and operational approval enablers (authoritative source — not in local library).
• FAA UAM ConOps v2.0 (2023) — CNS and procedural enablers for US AAM operations (authoritative source — not in local library; see https://www.faa.gov/air-taxis/).
• Doc 10209 (AN-Conf/14 Report), §2.25-2.27 — ICAO institutional enabler framework (authoritative source — not in local library).

The performance case for AAM#

AAM is justified to regulators and communities not simply as a new technology but as a transportation system that must demonstrate measurable improvements in safety, access, efficiency, and environmental impact to earn its regulatory and social licence.

The ICAO framework for performance measurement — eleven Key Performance Areas (KPAs) from Doc 9854 and Doc 9883 — provides the lens through which AAM must eventually be assessed, even though no ICAO-specific AAM KPI targets have been set. EASA's vertiport PTS-VPT-DSN and the FAA's UAM ConOps both reference performance objectives implicitly in their design and operational requirements.

This file maps AAM against the KPA framework at each maturity block, and defines the KPIs by which performance can be measured.

KPA contribution by AAM maturity block#

The matrix below scores each KPA by its principal benefit horizon across the four AAM maturity blocks (1 = some benefit, 2 = clear benefit, 3 = primary driver). It is editorial, but conveys where each block's centre of gravity lies.

Performance objectives by KPA#

Safety#

Performance objective. Demonstrate that AAM operations have accident and serious incident rates no worse than the best-performing comparable aviation segment (helicopter commercial operations), and ultimately match or improve on fixed-wing commercial air transport rates as autonomy matures.

Rationale. AN-Conf/14 (Doc 10209 §2.27) requires ICAO to develop guidance on identifying hazards and managing safety risks for eVTOL. The ICAO balanced approach to safety risk requires that novel operations demonstrate safety case equivalence before scaling.

KPIs.

Access and Equity#

Performance objective. Provide time-competitive air transport options between points that are currently served only by congested road or inadequate public transport, with fares progressively accessible to a broader income range.

Rationale. This is the core AAM value proposition — the "A" in AAM is "Advanced" precisely because it serves underserved markets. Doc 10177 §8.11.1 defines AAM as serving "places previously not served or underserved by aviation."

KPIs.

Environment#

Performance objective. Deliver lower noise exposure at community- level and lower CO2 lifecycle emissions compared to equivalent helicopter or private car journeys, while meeting the ICAO balanced approach requirements at vertiport sites.

Rationale. Doc 10177 §8.11.2 notes that AAM noise "may be dispersed to a wider area away from airports towards more urban areas than for traditional aircraft." CAEP/14 is developing noise certification standards for larger ETA. Electrification provides near-zero local emissions but lifecycle CO2 depends on grid mix.

KPIs.

Capacity#

Performance objective. Manage AAM traffic at vertiports and in UTM airspace at densities that do not degrade safety or delay performance beyond acceptable limits, and do not impose restrictions on existing aviation operations.

Rationale. At scale, a single vertiport must handle hundreds of movements per day. UTM must manage thousands of simultaneous aircraft in a metropolitan airspace volume. ATFM-equivalent mechanisms are needed before congestion becomes unmanageable.

KPIs.

Predictability#

Performance objective. Deliver schedule reliability that matches or exceeds existing premium ground transport options, enabling passengers and cargo to rely on AAM for time-critical journeys.

KPIs.

Interoperability#

Performance objective. Enable AAM aircraft and UTM systems from different manufacturers and service providers to operate together in shared airspace across national boundaries without pre-arranged bilateral agreements for every pair of operators.

Rationale. ICAO Assembly A41-9 called for a global harmonized framework for New Entrants. Without interoperability, AAM remains fragmented by jurisdiction.

KPIs.

How AAM performance is reported#

AAM performance reporting is nascent. No ICAO or EASA standard reporting framework exists yet. As of 2026:

• EASA: will collect safety occurrence data through the European Centralised Repository (ECR) once commercial operations begin. NPA 2024-01 proposes mandatory occurrence reporting for AAM operators.
• FAA: Aviation Safety Information Analysis and Sharing (ASIAS) will incorporate AAM data. FAA safety orders for eVTOL include reporting requirements.
• Industry: Global Urban Air Mobility Advisory Committee (UAMAC, affiliated with IATA and ACI) and the UTM industry consortium (GUTMA) are developing performance metrics frameworks.
• ICAO GANP: if ICAO introduces AAM as an ASBU sub-thread or new thread in a future GANP edition, the GANP Portal KPA/KPI framework would provide the global reporting structure.
• CAEP: will report on noise certification progress for larger ETA (AAM) as part of its triennial Environmental Report.

References#

• Doc 10177 (Manual on Operational Opportunities to Reduce Aircraft Noise), Chapter 8, §8.11.1–8.11.2 — AAM definition, noise evaluation, and balanced approach.
• Doc 10209 (AN-Conf/14 Report), §2.27(g) — ICAO directive to develop guidance for AAM hazard identification and safety risk management (authoritative source — not in local library).
• ICAO Circular 365 (2026), Background — CAEP/14 noise certification KPI development for larger ETA (authoritative source — not in local library).
• EASA PTS-VPT-DSN (Issue 1, 2022) — vertiport capacity and noise KPIs implicit in design requirements (authoritative source — not in local library).
• FAA Urban Air Mobility ConOps v2.0 (June 2023) — performance objectives for UAM phases including safety, access, and efficiency metrics (authoritative source — not in local library; see https://www.faa.gov/air-taxis/).
• Doc 9883 (Manual on Global Performance of the Air Navigation System) — KPA definitions used as the performance framework basis for AAM mapping.

Two timelines to keep distinct#

When discussing AAM "dates", separate two things:

1. Regulatory framework timeline — when certification standards, operating rules, and infrastructure standards were published by EASA, FAA, or ICAO.
2. Industry / operations timeline — when specific aircraft reached first flight, type certificate, or first commercial service.

A state's own AAM deployment plan is a third timeline: it is constrained by the regulatory milestones and by the availability of certificated aircraft and certified vertiports.

Regulatory framework timeline#

Industry / operations timeline#

Where ICAO SARPs development sits on this timeline#

The ICAO AAM regulatory framework lags the leading-edge industry timeline by several years — this is normal for ICAO SARPs development:

• First eVTOL flights: 2017.
• First ICAO Assembly resolution addressing New Entrants: 2022.
• AN-Conf/14 mandating ecosystem assessment: 2022.
• ICAO AAM Study Group report to Council: 2024.
• Expected SARP development initiation (if gap analysis warrants): 2025-2027.
• Expected first ICAO SARPs for AAM aircraft/vertiports/operations: 2028-2032 (dependent on Study Group output and ICAO Council decision on prioritization).

This timeline means that the first commercial eVTOL operations globally will be regulated by national or regional frameworks (EASA, FAA) rather than ICAO SARPs. ICAO's role in the first commercial phase is limited to:

• Providing the interim Annex 8 and Annex 14 Vol II frameworks.
• Hosting the AAM Study Group and the Standardization Roadmap.
• Facilitating bilateral TC validation through Annex 8 §1.4.2.
• Guiding states through Assembly Resolutions (A41-9).

How to read a date in an AAM document#

When an AAM document uses a date, check which kind it is:

• "SC-VTOL-01 (2019)" — EASA regulatory publication date.
• "First type certificate expected 2025/2026" — industry projection dependent on certification completion.
• "Block 2 (2026-2030)" — maturity block window, not a deadline.
• "Innovate28" — FAA milestone tied to a specific event (Olympics).
• "CAEP/14 deliverable" — ICAO committee work item timeline, not an operational date.

Mixing regulatory publication dates, industry projection dates, and maturity block windows is the most common source of confusion in AAM timeline discussions.

References#

• EASA SC-VTOL-01 (first published July 2019) — regulatory framework start date (authoritative source — not in local library; see https://www.easa.europa.eu/).
• EASA PTS-VPT-DSN (Issue 1, 2022) — vertiport standard publication date (authoritative source — not in local library).
• FAA Urban Air Mobility ConOps v2.0 (June 2023) — publication and operational phasing dates (authoritative source — not in local library).
• FAA Innovate28 Implementation Plan — 2028 milestone framework (authoritative source — not in local library; see https://www.faa.gov/air-taxis/innovate28).
• Doc 10209 (AN-Conf/14 Report, 2022) — ICAO AAM regulatory work programme initiation (authoritative source — not in local library).
• ICAO Circular 365 (2026) — CAEP/13 completion date and CAEP/14 work programme (authoritative source — not in local library).
• Doc 10219 (ICAO Council, 2024), §54-55 — AAM Study Group progress and 2024 Symposium (authoritative source — not in local library).

ICAO Documents (in local library)#

• Doc 10177 (Manual on Operational Opportunities to Reduce Aircraft Noise), Chapter 8, §8.11.1 — formal ICAO definition of Advanced Air Mobility (AAM); moves people and cargo between previously underserved places using revolutionary new aircraft with possible vertical lift and electric propulsion.
• Doc 10177, Chapter 8, §8.11.2 — AAM noise evaluation using the ICAO balanced approach; note that noise impacts may be dispersed to wider urban areas than traditional aircraft.
• ICAO Circular 365 (Interim Noise Measurement Guidelines for Smaller Emerging Technology Aircraft, 2026), Summary — CAEP classification of AAM as "larger Emerging Technology Aircraft"; CAEP/13 completed smaller ETA guidelines; CAEP/14 tasked with larger ETA (AAM) noise certification Standards.
• ICAO Circular 365, Background section — distinction between smaller ETA (UAS) and larger ETA (AAM); boundaries under deliberation; vertiport noise impacts in urban areas noted.
• Doc 10209 (AN-Conf/14 Report, 2022), §2.25 — Conference review of eVTOL certification and broader AAM considerations.
• Doc 10209, §2.26 — ICAO holistic and global approach to AAM; importance of monitoring eVTOL activities and sharing best practices.
• Doc 10209, §2.27 — Agreement on need for guidance on identifying hazards and managing safety risks for eVTOL; directive for ICAO to develop this guidance.
• Doc 10209, Recommendation §2.27(g) — ICAO directed to develop guidance supporting States in identifying hazards and managing safety risks for eVTOL and other AAM-related activities.
• Doc 10209, §2.21 — Conference discussion of UTM/AAM ecosystem assessment and gap analysis; strong ICAO leadership called for while cautioning against premature provisions.
• Doc 10183 (ICAO Assembly, 41st Session Technical Commission Report), §23.8 — Committee recognition of ICAO's critical role in global harmonization for AAM; recommendation for AAM expert group establishment.
• Doc 10183, §23.8 Resolution element — Request for ICAO to engage government entities on UAM and to prioritize the Industry Roadmap for Future Skies.
• Doc 10219 (ICAO Council, 2024), §54-55 — 2024 ICAO AAM Symposium lessons learned; AAM Study Group progress and way forward for the Standardization Roadmap.
• Doc 10219, §30 — Council assurance that AAM Study Group is working on a way forward and that this will be considered in context of the Standardization Roadmap.
• Doc 10184 (ICAO Assembly, 41st Session Resolutions), Resolution A41-9 — New Entrants policy framework; UTM and HAO defined as New Entrants; ICAO directed to review SARPs for New Entrant integration while not compromising safety.
• Doc 10184, A41-9, §5 — Directive to review SARPs in rules of air, ATS, certification, licensing, liability, and environment for amendment to facilitate New Entrant operations.
• Annex 8 (Airworthiness of Aircraft), Part II, Chapter 1, §1.4.1 — State of Design issues Type Certificate upon evidence of compliance with applicable airworthiness requirements; framework applicable to eVTOL in interim.
• Annex 8, Chapter 1, §1.4.2 — Other Contracting States issuing a TC must base it on compliance evidence; bilateral validation framework.
• Annex 14 Vol II (Heliports), Definitions — FATO (Final Approach and Take-Off Area) defined as the area over which the final phase of approach is completed and take-off commences; applicable to vertiport design.
• Annex 14 Vol II, §1.4 — Heliport certification requirements including heliport manual approval; competent authority certification process applicable to vertiports.
• Annex 14 Vol II, Chapter 3 — Physical characteristics including FATO dimensions, obstacle limitation surfaces, and TLOF requirements applicable to vertiport ground infrastructure design.
• Annex 16 Vol I (Aircraft Noise), Chapter 13 — Noise certification standard for tilt-rotor aircraft; nearest applicable Annex 16 standard for some eVTOL configurations pending new ETA standards.

ICAO Documents (not in local library — authoritative sources)#

• ICAO Assembly Resolution A41-9 (New Entrants, 2022) — New Entrants policy framework including UTM, HAO, and AAM; directs SARPs review and global harmonization (see https://www.icao.int/Meetings/a41/Documents/).
• ICAO AAM Symposium (2024) outputs — AAM Study Group progress; ecosystem assessment methodology; Standardization Roadmap inputs (see https://www.icao.int/Meetings/AAM/).
• Doc 9261 (Heliport Manual) — guidance on heliport design helicopter selection, certification process, and structural loading; reference baseline for vertiport certification until dedicated AAM document exists (authoritative source — not in local library).
• Doc 9883 (Manual on Global Performance of the Air Navigation System) — KPA definitions applied in the AAM performance objectives framework (authoritative source — not in local library).
• Doc 9854 (Global ATM Operational Concept) — ATM concept components applicable to AAM airspace integration (authoritative source — not in local library).

EASA Regulatory Instruments (authoritative sources — not in local library)#

• EASA Special Condition SC-VTOL-01 (first published July 2019, with amendments) — airworthiness requirements for VTOL-capable aircraft intended to transport passengers; covers structural integrity, propulsion (battery/motor), fly-by-wire flight control, performance, emergency systems, noise. See https://www.easa.europa.eu/en/document-library/product-certification-consultations/special-condition-vtol.
• EASA Means of Compliance (MOC SC-VTOL) — accepted means of showing compliance with SC-VTOL-01 requirements. See https://www.easa.europa.eu/en/document-library/product-certification-consultations/means-compliance-sc-vtol-01.
• EASA Prototype Technical Specifications for Vertiports (PTS-VPT-DSN, Issue 1, 2022) — vertiport design requirements: FATO geometry for VTOL aircraft, obstacle-free sectors, simultaneous operations, charging infrastructure, noise management, RFFS. See https://www.easa.europa.eu/en/document-library/easy-access-rules/prototype-technical-specifications-vertiports-pts-vpt-dsn-issue-1.
• EASA Notice of Proposed Amendment NPA 2024-01 (Innovative Air Mobility Operations) — proposed operational approval rules for initially piloted AAM/IAM services; AOC equivalent, pilot type rating, remote pilot station framework. See https://www.easa.europa.eu/en/document-library/notices-of-proposed-amendment/npa-2024-01.
• EU Regulation 2021/664 — U-space regulatory framework; defines U-space airspace, common information service, and UTM service categories. Official Journal of the EU.
• EU Regulation 2021/665 — UTM-to-ATC interface provisions supplementing Regulation 2021/664.

FAA Instruments (authoritative sources — not in local library)#

• FAA Urban Air Mobility ConOps v2.0 (June 2023) — definitive FAA operational concept for AAM: phases of UAM deployment, airspace integration architecture, UTM service layers. See https://www.faa.gov/sites/faa.gov/files/2023-06/uam_conops_v2.0.pdf.
• FAA Innovate28 (I28) Implementation Plan — FAA milestones for scaled AAM operations by 2028 Los Angeles Olympics: aircraft certification, vertiport approval, airspace integration. See https://www.faa.gov/air-taxis/innovate28.
• FAA Engineering Brief EB-105 (Vertiport Design) — US interim engineering guidance for vertiport infrastructure design pending formal FAA Advisory Circular. See https://www.faa.gov/airports/engineering/engineering_briefs/engineering_brief_105.
• FAA Powered-Lift Aircraft Certification Rules (2023) — Part 21 regulatory framework enabling Special Class type certification for eVTOL aircraft in the US.

NASA#

• NASA Advanced Air Mobility Mission — research and development supporting AAM vehicle, airspace, and community integration. See https://www.nasa.gov/aeronautics/advanced-air-mobility/.