Detailed reference on ICAO Search and Rescue (SAR) — the organizational, procedural, and technical framework for aeronautical and joint aeronautical-maritime SAR under Annex 12 and the IAMSAR Manual (Doc 9731). This folder expands the summary in topics/sar.md into per-aspect files so each can be read independently.

Files in this folder#

• overview.md — what SAR is, where it sits in the ICAO framework, and how it relates to adjacent topics (GADSS, Annex 11 alerting service).
• components.md — the structural building blocks: SRR, RCC/RSC, SAR units, alerting posts, COSPAS-SARSAT, ELTs, and communications.
• blocks.md — the emergency phases (INCERFA/ALERFA/DETRESFA) as the operational escalation tiers; SAR operation stages; mermaid phase escalation diagram.
• threads.md — the six functional axes of SAR: organization/SRR, RCC operations, alerting and detection, cooperation and agreements, procedures and IAMSAR, and training.
• modules.md — anatomy of one SAR response: an overdue aircraft escalating from INCERFA through ALERFA to DETRESFA with RCC actions at each step.
• enablers.md — CNS infrastructure, COSPAS-SARSAT satellite segment, ELT standards, procedures, training, legal framework, and inter-agency coordination requirements.
• performance_objectives.md — KPA-keyed performance table and KPIs for SAR service provision.
• timeline.md — historical evolution: Annex 12 editions and amendments, IAMSAR Manual origins, COSPAS-SARSAT milestones, GADSS/LADR integration.
• references.md — consolidated ICAO and authoritative external references for all content in this folder.

Reading order#

Start with overview.md to understand the SAR framework and its place in ICAO. components.md maps the structural elements. blocks.md and threads.md explain the escalation model and functional axes. modules.md provides a concrete end-to-end worked example. enablers.md covers infrastructure dependencies. Use performance_objectives.md for KPA/KPI context and timeline.md for date anchoring. references.md is the consolidated citation list.

Source basis#

Content is grounded in:

• ICAO Annex 12 (Search and Rescue), 9th Edition (Amendment 19, 2024).
• ICAO Annex 11 (Air Traffic Services), Chapter 5 — Alerting Service.
• ICAO Doc 4444 (PANS-ATM), Chapter 9 — Alerting Service procedures.
• ICAO Annex 6, Parts I, II, III — ELT carriage requirements.
• ICAO Annex 10, Volume III — ELT technical specifications.
• ICAO Doc 9731 (IAMSAR Manual), Vols I–III — joint ICAO/IMO SAR guidance (not in local ICAO-Apr-26 library; referenced by Annex 12 normative Note at §283 of local md rendering).
• ICAO Doc 10165 (GADSS Manual) — LADR and OPS Control Directory guidance (not in local library).
• COSPAS-SARSAT system documentation (authoritative source — not in local library): https://www.cospas-sarsat.int/

What SAR is#

Search and Rescue (SAR) is the organized service for monitoring aircraft in distress, coordinating and communicating with those aircraft, locating their crash or ditching sites, and rescuing survivors. In the ICAO framework, SAR is mandated by Annex 12 to the Chicago Convention and is supplemented by joint ICAO/IMO guidance in the IAMSAR Manual (Doc 9731).

SAR is simultaneously an organizational framework (the network of SRRs and RCCs), a procedural framework (the three emergency phases and the SAR operation stages), and a technical framework (COSPAS-SARSAT satellite alerting, ELT specifications, communications requirements). These three dimensions must all be in place for effective SAR service.

SAR is deliberately non-discriminatory: Annex 12 §2.1.2 requires that States provide SAR assistance regardless of the nationality or status of persons in distress or the circumstances in which they are found.

Where SAR sits in the ICAO framework#

SAR is one of the Air Navigation Services established under the Chicago Convention. It is normatively separate from Air Traffic Services (ATS) defined in Annex 11, but deeply interlinked:

1. Alerting service (Annex 11 / Doc 4444) is the procedural bridge between ATC and SAR. ATS units monitor all flights they provide service to for the three emergency phase conditions and notify the RCC using the standard INCERFA/ALERFA/DETRESFA format. Without the alerting service, most SAR responses would not begin.

2. GADSS (Annex 6 / Doc 10165) provides RCCs with real-time aircraft position through the Location of an Aircraft in Distress Repository (LADR). Amendment 19 of Annex 12 makes LADR subscription mandatory for each RCC (§2.3.7). GADSS is the modern complement to COSPAS-SARSAT for large aircraft.

3. Annex 6 (Aircraft Operations) mandates ELT carriage on commercial aircraft (Parts I and II) and specifies that ELTs must meet Annex 10, Volume III specifications. The 406 MHz digital ELT is the primary SAR alerting device for general aviation and smaller aircraft.

4. Annex 10, Volume III contains the technical specifications for ELTs, including the COSPAS-SARSAT frequency bands (121.5 MHz for homing; 406 MHz for digital distress alerting with encoded identity and GPS position).

5. Doc 7030 (Regional Supplementary Procedures) provides regionally specific SAR procedures supplementing the global SARPs of Annex 12.

The SAR-ATS interface#

The alerting service is the most operationally critical interface. Annex 11 §5.1.2 assigns FICs and ACCs as the central collection point for emergency information within their FIR, forwarding to the RCC. The timing thresholds are normative: uncertainty phase if 30 minutes without contact; alert phase if subsequent inquiries yield no news; distress phase when there is probability that the aircraft is in distress. These thresholds from Annex 11 §5.2.1 are mirrored in Doc 4444 §9.2 as the PANS-ATM operating procedures.

The ATS unit does not conduct SAR — it triggers and supports. Once DETRESFA is declared, the RCC assumes operational coordination. The ATS unit continues to pass information and relay RCC actions to the flight if it remains communicable.

SAR and GADSS#

The GADSS autonomous distress tracking (ADT) requirement for large aeroplanes (Annex 6 Part I, Appendix 9) means that from 1 January 2021 new large aeroplanes must transmit aircraft position automatically during a distress condition, without crew action. These transmissions populate the LADR. Under Annex 12 Amendment 19, RCCs must subscribe to the LADR so that GADSS position data is available to inform search area calculation from the first moment of DETRESFA. This reduces the search area size and response time — the primary performance benefit of GADSS for SAR.

SAR as a global public good#

ICAO Annex 12 expresses SAR as a global cooperative obligation. No State can confine SAR strictly to its sovereign airspace: the high seas must be covered under regional air navigation agreements, and States must permit entry of foreign SAR units and accept assistance. The IAMSAR Manual operationalizes this cooperation by providing common procedures, search patterns, coordination signals, and planning tools that work regardless of whether the first responder is military, civil, or commercial, and whether the emergency is aeronautical or maritime.

References#

• Annex 12 (Search and Rescue), 9th Edition, Chapter 1 — Definitions of SAR terms.
• Annex 12, Chapter 2, §2.1.1 — Mandatory 24-hour SAR service obligation.
• Annex 12, Chapter 2, §2.3.7 — LADR subscription requirement for RCCs; GADSS Manual Doc 10165.
• Annex 11 (Air Traffic Services), Chapter 5, §5.1.2 — FIC/ACC as central emergency information collection point.
• Annex 11, Chapter 5, §5.2.1 — Triggers for each emergency phase.
• Doc 4444 (PANS-ATM), Chapter 9, §9.2 — Alerting service operating procedures.
• Doc 9731 (IAMSAR Manual), Vols I–III — Joint ICAO/IMO SAR guidance (authoritative source — not in local library).
• Doc 10165 (GADSS Manual) — LADR and OPS Control Directory guidance (authoritative source — not in local library).

Building blocks of the SAR system#

The SAR system under Annex 12 is composed of six classes of constituent elements. Each is normatively defined in Annex 12 Chapter 1 and governed by SARPs in Chapters 2 through 5.

1. Search and Rescue Regions (SRRs)#

A Search and Rescue Region (SRR) is an area of defined dimensions, associated with a Rescue Coordination Centre, within which SAR services are provided (Annex 12 §1). The key properties:

• SRRs must not overlap each other.
• Neighbouring SRRs must be contiguous — no gaps.
• SRRs should, as far as practicable, coincide with corresponding FIRs to align the ATC alerting boundary with the SAR boundary.
• On the high seas, SRR boundaries are determined by regional air navigation agreement, not national sovereignty.
• States may cooperate to establish a single SAR region encompassing more than one State's territory (Annex 12 §2.2.1, Note 1).

The global SRR structure is published in the relevant Air Navigation Plans and in the ICAO SAR Regional Plans for each ICAO region.

2. Rescue Coordination Centres (RCCs) and Rescue Subcentres (RSCs)#

The RCC is the operational hub of each SRR. Annex 12 mandates:

• One RCC per SRR (§2.3.1).
• 24-hour staffing by trained personnel (§2.3.3).
• Proficiency in the language used for radiotelephony communications in the region (§2.3.3); English proficiency recommended (§2.3.4).
• Subscription to the LADR (§2.3.7).
• Up-to-date contact details in the OPS Control Directory (§2.3.6).

A Rescue Subcentre (RSC) is subordinate to the RCC and is established where it would improve SAR efficiency — typically where a large SRR spans a State whose territory falls within another State's RCC jurisdiction (§2.3.2). The RSC mirrors the RCC communications requirements at its own scale.

A Joint Rescue Coordination Centre (JRCC) combines aeronautical and maritime SAR under a single authority — the preferred model where practical (§2.1.6).

3. Alerting Posts#

An alerting post is a facility intended to serve as an intermediary between a person reporting an emergency and the RCC (Annex 12 §1). They are established in areas where public telecommunications would not allow direct notification of the RCC (§2.3.5). Public or private services may be designated as alerting posts. The alerting post receives initial emergency information and relays it to the RCC.

4. SAR Units#

A SAR unit is a mobile resource composed of trained personnel with equipment suitable for expeditious SAR operations (Annex 12 §1). SAR units are designated from public or private services by the State (§2.5.1) and must:

• Know all parts of the SAR plan of operations relevant to their duties.
• Keep the RCC informed of their preparedness.
• Have rapid two-way communication capability during operations.

Elements that do not qualify as SAR units but can participate in SAR operations are designated separately under the plan of operations (§2.5.2). SAR aircraft are a subclass of SAR unit; they must be equipped to communicate on aeronautical distress frequencies, to home on distress frequencies, and — over maritime areas — to communicate with vessels (§2.6.3–2.6.5).

5. COSPAS-SARSAT System#

COSPAS-SARSAT is the international satellite-based distress alert and location system. It is a four-nation intergovernmental programme (Canada, France, Russia, USA) with a global network of ground stations and Mission Control Centres.

The system receives 406 MHz Emergency Locator Transmitter (ELT) signals via three satellite segments:

• LEOSAR (Low Earth Orbit) — Doppler-based location; global coverage with orbital delay.
• GEOSAR (Geostationary) — near-instant alert relay; no Doppler location in polar regions.
• MEOSAR (Medium Earth Orbit) — near-real-time alert relay with GPS-encoded position; provides near-instantaneous worldwide coverage with position accuracy to within 100 m when the beacon has an internal GNSS receiver.

The MEOSAR segment represents the current-generation capability, providing rapid (under 5 minutes) distress alerting with position data to the responsible Mission Control Centre, which forwards to the national SAR point of contact for relay to the RCC.

Annex 12 §3.2.5 (applicable as of 26 November 2026) requires each State to designate a 24-hour SAR point of contact for receipt and acknowledgement of COSPAS-SARSAT distress alert data, ensuring timely RCC notification.

6. Emergency Locator Transmitters (ELTs)#

ELTs are the aircraft-side component of the COSPAS-SARSAT alerting chain. Annex 12 cross-references to Annex 6 for carriage requirements and Annex 10 Vol III for technical specifications. Types defined in Annex 6 Part II:

• ELT(AF) — automatic fixed: permanently attached, auto-activated by impact.
• ELT(AP) — automatic portable: rigidly attached, auto-activated, removable.
• ELT(AD) — automatic deployable: auto-deployed and activated by impact or hydrostatic sensor; also manually deployable.
• ELT(S) — survival: removable from aircraft, manually activated by survivors.

The digital 406 MHz signal encodes the aircraft's 24-bit identifier (from ICAO registration) and, for GPS-equipped beacons, the position. The 121.5 MHz signal provides the homing frequency for on-scene SAR aircraft.

ELT frequency note: Until 25 November 2026, the ELT frequencies specified in Annex 10, Vol III are 121.5 MHz and 406 MHz. As of 26 November 2026, the specification is 121.5 MHz and 406.0 to 406.1 MHz, with the COSPAS-SARSAT 406 MHz channel assignment plan contained in Cospas-Sarsat Document C/S T.012.

7. SAR Communications Network#

Each RCC must maintain rapid, reliable two-way communications with (Annex 12 §2.4.1):

• Associated ATS units.
• Associated RSCs.
• Direction-finding and position-fixing stations.
• Coastal radio stations capable of alerting and communicating with surface vessels.
• SAR unit headquarters.
• All maritime RCCs in the region and adjacent aeronautical/maritime/ joint RCCs.
• A designated meteorological office or watch office.
• SAR units.
• Alerting posts.
• The COSPAS-SARSAT Mission Control Centre serving the SRR.

This ten-element communication fabric ensures the RCC can receive distress information from any source and coordinate response across all relevant services.

References#

• Annex 12, Chapter 1 — Definitions: SRR, RCC, RSC, SAR unit, alerting post.
• Annex 12, Chapter 2, §2.1.1.2 — Basic elements of SAR services.
• Annex 12, Chapter 2, §2.3.1 to §2.3.7 — RCC establishment, staffing, LADR.
• Annex 12, Chapter 2, §2.4.1 — RCC communications network requirements.
• Annex 12, Chapter 2, §2.5 — SAR unit designation.
• Annex 12, Chapter 2, §2.6 — SAR equipment; ELT references to Annex 6 and Annex 10 Vol III.
• Annex 12, Chapter 3, §3.2.5 (as of 26 November 2026) — 24-hour SAR point of contact for COSPAS-SARSAT.
• Annex 6, Part II, §2.4.12 — ELT carriage requirements for general aviation aeroplanes.
• Annex 10, Volume III — ELT technical specifications (authoritative source — not further expanded in this library).
• Doc 9731 (IAMSAR Manual), Vol II — Mission coordination procedures (authoritative source — not in local library).
• https://www.cospas-sarsat.int/ - COSPAS-SARSAT programme: MEOSAR status, MCC directory, C/S T.012 channel plan.

The escalation model#

SAR in the Annex 12 framework does not use the ASBU Block (B0/B1/B2/B3) vocabulary. The analogous structuring axes for SAR are:

• Emergency phases — the three normative states that govern the escalating level of RCC response, triggered by ATS units.
• SAR operation stages — the five internal workflow stages the RCC and SAR units progress through from first notification to conclusion, as described in the IAMSAR Manual.

These two axes are orthogonal: the emergency phase governs the threshold for action, while the operation stage governs what the RCC is doing at any moment during the response.

Emergency phases#

INCERFA — Uncertainty Phase#

Definition. A situation wherein uncertainty exists as to the safety of an aircraft and its occupants (Annex 12 Chapter 1).

Trigger (Annex 11 §5.2.1(a)).

• No communication received within 30 minutes of the time communication should have been received, or from the first unsuccessful attempt to establish contact — whichever is earlier; or
• Aircraft fails to arrive within 30 minutes of ETA last notified to or estimated by ATS.

RCC action. Upon INCERFA the RCC cooperates closely with ATS units and other relevant agencies to speedily evaluate incoming reports (Annex 12 §5.2.1). The RCC does not yet mobilize SAR units but gathers all available flight plan and position information.

Codeword. INCERFA. Formally defined in Doc 4444 as the codeword to designate an uncertainty phase.

ALERFA — Alert Phase#

Definition. A situation wherein apprehension exists as to the safety of an aircraft and its occupants (Annex 12 Chapter 1).

Trigger (Annex 11 §5.2.1(b)).

• Following INCERFA, subsequent contact attempts and inquiries have failed to reveal any news of the aircraft; or
• Aircraft cleared to land fails to land within 5 minutes of ETA and contact has not been re-established; or
• Information received indicates operating efficiency of the aircraft is impaired, but not to the extent that forced landing is likely; or
• Aircraft known or believed to be subject to unlawful interference.

RCC action. Immediately alert SAR units and initiate any necessary action (Annex 12 §5.2.2). The RCC begins active preparation.

Codeword. ALERFA. Formally defined in Doc 4444 as the codeword to designate an alert phase.

DETRESFA — Distress Phase#

Definition. A situation wherein there is a reasonable certainty that an aircraft and its occupants are threatened by grave and imminent danger and require immediate assistance (Annex 12 Chapter 1).

Trigger (Annex 11 §5.2.1(c)).

• Following ALERFA, further unsuccessful inquiries point to probability that the aircraft is in distress; or
• Fuel on board exhausted or insufficient to reach safety; or
• Operating efficiency impaired to the extent that forced landing is likely; or
• Aircraft is about to make or has made a forced landing.

RCC action (Annex 12 §5.2.3 — ten required steps). a) Immediately initiate SAR units under the plan of operations. b) Determine aircraft position, uncertainty radius, and search area. c) Notify and keep informed the operator. d) Notify other RCCs whose help may be needed. e) Notify the associated ATS unit if info came from another source. f) Request all available aircraft/vessels to monitor distress frequencies (121.5 MHz and 406 MHz ELT homing). g) Draw up a detailed plan of action; communicate to directing authorities. h) Amend the plan as circumstances evolve. i) Notify the appropriate accident investigation authorities. j) Notify the State of Registry of the aircraft.

Codeword. DETRESFA. Formally defined in Doc 4444 as the codeword to designate a distress phase.

SAR operation stages (IAMSAR model)#

The IAMSAR Manual (Doc 9731, Vol I and II) describes SAR operations as progressing through five stages. These stages drive internal RCC workflow regardless of which emergency phase has been declared.

Phase-stage interaction#

Emergency phases and operation stages run concurrently. During INCERFA the RCC is in Awareness/Initial Action stages. ALERFA transitions into active Planning. DETRESFA activates the Operations stage. Conclusion is independent of phase — it is reached when the operation ends regardless of the phase at which operations were fully mobilized.

Multi-region coordination#

When the aircraft's position is unknown and may fall within two or more SRRs, Annex 12 §5.2.4 prescribes the rule for designating a coordinating RCC:

• Default: the RCC responsible for the region of the aircraft's last reported position.
• If last position was on the boundary: the RCC for the region towards which the aircraft was proceeding.
• If aircraft had no radio: the RCC for the destination region.
• If COSPAS-SARSAT identifies the distress site: the RCC for that region.

All involved RCCs share information; the coordinating RCC has overall responsibility and notifies all others of developments.

References#

• Annex 12, Chapter 1 — Definitions: alert phase, distress phase, emergency phase, uncertainty phase.
• Annex 12, Chapter 5, §5.2.1 to §5.2.4 — RCC procedures for each phase; multi-region coordination.
• Annex 11, Chapter 5, §5.2.1 — ATS phase triggers and timing thresholds.
• Doc 4444 (PANS-ATM), Chapter 1 — Definitions: INCERFA, ALERFA, DETRESFA.
• Doc 4444, Chapter 9, §9.2 — Alerting service operating procedures including 30-minute rule.
• Doc 9731 (IAMSAR Manual), Vol I and II — SAR operation stages and mission coordination (authoritative source — not in local library).

The six functional axes of SAR#

SAR does not use the ASBU thread vocabulary, but it can be understood through six functional axes that together constitute the service. Each axis is a distinct domain of policy, technology, and procedure that must be addressed for the SAR system to operate effectively.

The six axes are:

1. Organization and SRR delineation
2. RCC operations
3. Alerting and detection — COSPAS-SARSAT and ATS interface
4. Cooperation and bilateral/multilateral agreements
5. Procedures — IAMSAR coordination methods
6. Training and exercises

Axis 1 — Organization and SRR Delineation#

What it covers. The legal framework establishing the SAR service; the delineation of SRR boundaries; assignment of States' responsibilities for the high seas; and the decision on whether to establish a JRCC or separate aeronautical/maritime RCCs.

Key normative requirements.

• States must individually or cooperatively arrange 24-hour SAR services (Annex 12 §2.1.1).
• Basic elements of SAR: legal framework, responsible authority, organized resources, communications, skilled workforce (§2.1.1.2).
• SRR non-overlap and contiguity rules (§2.2.1).
• High-seas SRRs determined by regional air navigation agreement (§2.1.1.1).
• Joint RCCs encouraged where aeronautical and maritime SAR share the same area (§2.1.6).

Challenges. Aligning SRR boundaries with FIRs — especially over the high seas — requires coordination across States and within ICAO regional planning groups. States with limited resources may cooperate under a common SRR and shared RCC.

Axis 2 — RCC Operations#

What it covers. The internal functioning of the RCC: preparatory information maintenance, plans of operation, staffing, LADR access, OPS Control Directory entries, and operational decision-making during emergency responses.

Key normative requirements.

• Each RCC to maintain up-to-date preparatory information covering SAR units, ATS units, communications means, operator details, and public resources (§4.1.1).
• Detailed plans of operation prepared for the SRR, covering all contingencies from basic alerting through cross-border operations (§4.2.4).
• RCC subscription to the LADR to access GADSS-derived aircraft position data (§2.3.7).
• 24-hour staffing and language proficiency (§2.3.3, §2.3.4).

The GADSS link. Under Annex 12 Amendment 19, LADR access is now a mandatory requirement for each RCC. This operationalizes the GADSS network for SAR: when a large aeroplane triggers autonomous distress tracking, the position is deposited in the LADR and immediately accessible to the responsible RCC, reducing the need to wait for COSPAS-SARSAT processing or ATS reports.

Axis 3 — Alerting and Detection#

What it covers. The two complementary alerting pathways into the RCC: the ATS alerting service (Annex 11 / Doc 4444) and the COSPAS-SARSAT satellite alerting system (Annex 12 §3.2.5 / Annex 10 Vol III / Annex 6).

ATS alerting service pathway. ATS units monitor all flights under their service for loss of contact or failure to arrive, applying the 30-minute INCERFA threshold. The ATS unit notifies the RCC using the standard format (INCERFA/ALERFA/ DETRESFA prefix; aircraft details; last contact; last position). Doc 4444 §9.2 provides the complete procedural framework.

COSPAS-SARSAT pathway. A 406 MHz ELT on the aircraft transmits on activation. The signal is processed by the COSPAS-SARSAT network (LEOSAR, GEOSAR, MEOSAR) and forwarded to the Mission Control Centre serving the SRR. The MCC relays to the national SAR point of contact, which notifies the RCC. The MEOSAR segment provides near-instantaneous alerting with GPS-derived position, making it the primary detection means for modern aircraft equipped with GNSS-capable 406 MHz ELTs.

Convergence at DETRESFA. In the event of a catastrophic accident, both pathways may activate simultaneously: ATS loses radar contact and declares DETRESFA while COSPAS-SARSAT receives the ELT signal. The LADR may also provide the last autonomous distress track position. The RCC cross-checks all three sources to minimize the search area.

Axis 4 — Cooperation and Agreements#

What it covers. The bilateral and multilateral arrangements between States for mutual SAR assistance: entry permissions, resource sharing, joint planning, and liaison.

Key normative requirements.

• States shall coordinate SAR organizations with neighbours (§3.1.1).
• States shall permit immediate entry of foreign SAR units for accident-site search and survivor rescue — even before a formal request arrives (§3.1.3).
• The formal request procedure and acknowledgement requirements (§3.1.4).
• Recommended: bilateral agreements covering entry conditions, expedited customs/immigration, and sharing of resources (§3.1.5).
• RCCs authorized to request and grant assistance (§3.1.6, §3.1.7).

The cooperation imperative. Over the high seas and remote areas, no single State has sufficient SAR resources for all contingencies. The global SAR coverage commitment is only realizable through the cooperative framework — States near the accident site will be mobilized even if the aircraft is registered elsewhere and was flying through a third State's SRR.

Axis 5 — Procedures and IAMSAR Guidance#

What it covers. The detailed operational procedures for SAR response, grounded in the IAMSAR Manual (Doc 9731). These include: search planning methods (datum, uncertainty area, search patterns), on-scene coordination, procedures for assisting ditching aircraft, use of survival signals (Annex 12 Appendix), and SAR communications protocols.

IAMSAR Manual structure.

• Vol I: Organization and Management — SAR system design, RCC establishment, cooperative arrangements, training frameworks.
• Vol II: Mission Co-ordination — operational procedures for the RCC: search planning, SAR operation stages, coordination with other services.
• Vol III: Mobile Facilities — on-scene procedures for SAR units and other vessels/aircraft: visual signals, SAR patterns, survivor assistance.

On-scene coordinator. When multiple SAR facilities are deployed, Annex 12 §5.6.1 requires the RCC to designate an on-scene coordinator. The first non-SAR aircraft to arrive takes on-scene responsibility until the first dedicated SAR aircraft arrives (§5.6.2.1).

Visual signals. Air-to-surface and surface-to-air visual signals, published in the Annex 12 Appendix and in IAMSAR Vol III, allow coordination when radio communication is unavailable. These include aircraft manoeuvres directing surface craft and survivor ground signals.

Axis 6 — Training and Exercises#

What it covers. The regulatory obligation to maintain competency through training and exercises, with periodic performance appraisals.

Key normative requirements.

• States shall provide regular training for SAR personnel and arrange SAR exercises (Annex 12 §4.4).
• As of 26 November 2026 (Amendment 19): exercises must include both land and maritime environments as appropriate, with both search and rescue elements remote from an aerodrome (§4.4, revised provision).
• Joint exercises with SAR units of other States recommended (§3.1.8, revised as of 26 Nov 2026 to include RCCs and RSCs).
• Periodic liaison visits by RCC personnel to neighbouring centres recommended (§3.1.9).
• RCCs should maintain operational efficiency records and prepare appraisals of actual operations, sharing noteworthy items with ICAO (§5.9.1, §5.9.2).

References#

• Annex 12, Chapter 2, §2.1.1.2 — Basic elements of SAR.
• Annex 12, Chapter 2, §2.3 — RCC/RSC establishment, staffing, LADR.
• Annex 12, Chapter 2, §2.4 — RCC communications.
• Annex 12, Chapter 3, §3.1 — Cooperation between States.
• Annex 12, Chapter 3, §3.2 — Cooperation with other services; COSPAS-SARSAT.
• Annex 12, Chapter 4, §4.4 — Training and exercises (including Amendment 19 provisions).
• Annex 12, Chapter 5, §5.6.1 — On-scene coordinator designation.
• Annex 11, Chapter 5, §5.2 — Alerting service: phase triggers and notification.
• Doc 4444 (PANS-ATM), Chapter 9, §9.2 — Alerting service procedures.
• Doc 9731 (IAMSAR Manual), Vols I–III — IAMSAR procedures (authoritative source — not in local library).

The worked scenario#

This module traces a single SAR event from normal flight through the three emergency phases to rescue, showing the specific ICAO SARPs invoked and the actions required of each party at each step. The scenario is constructed from the normative requirements in Annex 12, Annex 11, and Doc 4444.

Flight. Commercial turboprop on a domestic flight from City A to City B. Filed IFR flight plan, 2-hour flight, 40 persons on board. Estimated time of arrival at City B: 1400 UTC.

Weather. Instrument meteorological conditions (IMC) at City B. No en-route diversion. Final radar contact at City A ACC at 1215 UTC at last reported position, then contact lost.

Phase 0 — Normal operations (up to 1215 UTC)#

The ACC at City A provides ATC and alerting service to the flight. The flight has filed its IFR flight plan and is being tracked. At 1215 UTC the aircraft makes its last position report and ceases to respond. The controller attempts to re-establish contact on the assigned frequency and on 121.5 MHz. 20 minutes elapse with no response.

Applicable provision. Doc 4444 §9.2.2.1: the ATS unit shall within 30 minutes endeavour to obtain a report in order to be in a position to apply INCERFA provisions if circumstances warrant.

Phase 1 — INCERFA (1245 UTC)#

At 1245 UTC — 30 minutes after the scheduled reporting time — the ACC declares INCERFA. Contact attempts have failed. No one else in the sector has heard the aircraft.

ATS actions (Annex 11 §5.2.1(a); Doc 4444 §9.2):

• Declare INCERFA; log the time.
• Attempt contact via all available means (other ATS units in the FIR, operator, adjacent ACC).
• Notify the RCC using the INCERFA notification format (Annex 11 §5.2.2): aircraft callsign, type, last known position and time, flight plan details, persons on board, endurance, dangerous goods.
• Continue monitoring 121.5 MHz and 406 MHz for ELT transmissions.

RCC actions (Annex 12 §5.2.1):

• Cooperate closely with ATS to evaluate incoming reports speedily.
• Check LADR for any autonomous distress tracking position from the aircraft (mandatory LADR access per Annex 12 §2.3.7).
• Query the operator for any contact with the aircraft.
• No SAR units deployed yet — RCC is in Awareness/Initial Action stages.

At 1245 UTC the City B ACC also contacts the ACC: the aircraft is overdue. It fails to arrive within 30 minutes of ETA (1430 UTC is the 30-minute window from the 1400 ETA). The 30-minute no-comms trigger has already fired; INCERFA is confirmed.

Phase 2 — ALERFA (1310 UTC)#

At 1310 UTC — 25 minutes into INCERFA — all contact attempts have failed. Operator has no contact. ATC in all adjacent FIRs have no trace. No COSPAS-SARSAT alert has been received yet (aircraft may not have impacted; ELT may not have activated).

ATS escalation trigger (Annex 11 §5.2.1(b)(1)): Subsequent attempts to establish communication have failed to reveal any news of the aircraft.

ATS action: ATS unit declares ALERFA and notifies the RCC.

RCC actions (Annex 12 §5.2.2):

• Immediately alert SAR units (helicopter and fixed-wing) to stand by.
• Formally request COSPAS-SARSAT Mission Control Centre to report any 406 MHz ELT signal in the relevant SRR (§2.4.1(j)).
• Begin initial search area planning: datum estimated from last radar contact at 1215 UTC, aircraft track and speed, and a maximum search radius based on fuel endurance.
• Notify adjacent RCCs whose SRR may be involved.
• Notify the State of Registry (if different from State of the RCC).

SAR units (Axis 5 — preparatory stage): Helicopter unit at the closest SAR base receives ALERFA notification and begins pre-flight preparation. Fixed-wing maritime patrol aircraft at regional base is placed on 30-minute standby.

Phase 3 — DETRESFA (1345 UTC)#

At 1345 UTC the COSPAS-SARSAT Mission Control Centre reports a 406 MHz ELT activation from a position in mountainous terrain at the boundary of the SRR. The encoded aircraft ID matches the missing flight. GPS-encoded position is provided.

DETRESFA trigger (Annex 11 §5.2.1(c)(4)): Information received that the aircraft has made a forced landing.

ATS action: Declare DETRESFA; notify RCC with all available information. Pass information to any aircraft that may be operating near the COSPAS-SARSAT position.

RCC actions (Annex 12 §5.2.3):

a) Immediately initiate SAR units. Helicopter dispatched to COSPAS-SARSAT coordinates. Fixed-wing directed to orbit overhead for communications relay.

b) Determine search area. Datum is the COSPAS-SARSAT GPS position (accuracy within 100 m for GPS-equipped 406 MHz ELT). LADR position confirms the datum. Search area is a narrow circle around the COSPAS-SARSAT coordinates given the high-accuracy position data.

c) Notify operator. RCC contacts the airline's operations centre, confirms DETRESFA, and shares coordinates. Operator activates its emergency response plan.

d) Notify adjacent RCCs. The accident site is near the SRR boundary. RCC notifies the adjacent RCC and designates itself as coordinating RCC per Annex 12 §5.2.4 (site identified by COSPAS-SARSAT falls in this SRR).

e) Notify ATS unit. Already involved; RCC confirms coordinating role and requests ATS to keep 121.5 MHz watch.

f) Broadcast to all traffic. ATS issues an urgency broadcast on all relevant ATC frequencies requesting aircraft in the area to monitor 121.5 MHz and report any ELT signal or visual sighting.

g) Detailed plan of action. RCC draws up the plan: helicopter direct to GPS coordinates (estimated arrival 1420 UTC); fixed-wing overhead relay; medical team on standby at regional hospital.

h) Plan amendments. At 1415 UTC helicopter reports difficult terrain; RCC adjusts to a modified landing zone 2 km south. Plan amended, all parties notified.

i) Accident investigation. RCC notifies the State's accident investigation body.

j) State of Registry. Notification sent to the State of Registry (same State in this scenario; confirmation logged).

Phase 4 — On-scene operations#

At 1420 UTC the helicopter reaches the crash site. The on-scene coordinator (helicopter pilot) assumes charge per Annex 12 §5.6.1. A second helicopter from the adjacent State's SAR force (under the bilateral agreement) arrives at 1445 UTC; the original helicopter remains on-scene coordinator.

Communication: helicopter communicates with RCC on designated SAR frequency. Fixed-wing relays to RCC when terrain blocks direct helicopter-RCC communications.

Survivors: 34 of 40 persons located and in stable condition. 6 fatalities. Medical evacuation begins at 1510 UTC.

Phase 5 — Conclusion (1700 UTC)#

All 34 survivors delivered to the regional hospital. RCC confirms with on-scene coordinator that no remaining survivors are at the site. Emergency phase cancelled (Annex 12 §5.5.3). All notified parties informed: ATS units, adjacent RCCs, operator, State of Registry, accident investigation authority.

RCC begins preparation of the operational appraisal (§5.9.2): review of response times, COSPAS-SARSAT performance, LADR integration, inter-RCC coordination, on-scene communications.

Key metrics from this scenario#

• INCERFA to DETRESFA: 60 minutes.
• COSPAS-SARSAT alert received: 30 minutes after ALERFA.
• First SAR unit on scene: 35 minutes after DETRESFA.
• Total elapsed time (INCERFA to survivors safe): ~2.5 hours.

The GPS-encoded 406 MHz ELT was the decisive element — it provided an accurate datum, eliminating the need for a wide-area search in mountainous terrain.

References#

• Annex 12, Chapter 5, §5.2.1 to §5.2.5 — Phase-by-phase RCC procedures.
• Annex 12, Chapter 5, §5.5.1 to §5.5.4 — Termination and suspension of operations.
• Annex 12, Chapter 5, §5.6.1 — On-scene coordinator designation.
• Annex 11, Chapter 5, §5.2.1 — ATS phase triggers.
• Doc 4444 (PANS-ATM), Chapter 9, §9.2 — Alerting service procedures; 30-minute rule.
• Doc 4444, Chapter 15 — Phraseology and procedures for emergency situations.
• Doc 9731 (IAMSAR Manual), Vol II — Mission coordination; search planning (authoritative source — not in local library).

Overview#

Effective SAR service depends on six categories of enabler: the legal and institutional framework, communications infrastructure, the COSPAS-SARSAT satellite system and ELT equipment, GADSS/LADR integration, IAMSAR procedures and training, and bilateral/multilateral cooperation agreements. Failure in any category degrades SAR capability even if the others are in place.

1. Legal and Institutional Framework#

What is required.

• A national legal framework that gives the SAR authority the power to compel cooperation from public and private services.
• Designation of a responsible authority (civil aviation, military, coastguard, or a dedicated SAR authority).
• Formal establishment of the RCC with its SRR.
• Publication of SAR service information through the AIP (Annex 15 requires promulgation of SAR service details).

Normative basis. Annex 12 §2.1.1.2 lists "legal framework" and "responsible authority" as basic elements of SAR services. The Annex 12 Foreword encourages States to incorporate Annex 12 language directly into national legislation.

Common shortfall. States that have designated only a military SAR authority may lack coverage for civil aviation accidents in remote areas, or may have response time constraints if military assets are prioritized for other missions.

2. Communications Infrastructure#

What is required.

• A 24-hour RCC communications centre linked to all 10 mandatory communication points specified in Annex 12 §2.4.1.
• Secure, reliable voice and data circuits to ATS units, adjacent RCCs, and maritime RCCs.
• Access to the COSPAS-SARSAT Mission Control Centre serving the SRR.
• Monitoring of 121.5 MHz (homing) and 406 MHz (primary distress) at appropriate locations.
• Integration with the OPS Control Directory for standardized directory access (Annex 12 §2.3.6).

The ATS interface. The ATS unit providing alerting service must have a direct, rapid link to the RCC. Doc 4444 §9.2.2.3 requires the alerting service unit to notify ATS units in other FIRs of the declared phase, in addition to notifying the RCC.

Frequency transition (Amendment 19). As of 26 November 2026, vessels monitor Channel 16 (156.8 MHz) as the primary maritime distress frequency. SAR aircraft over maritime areas must be able to communicate on this frequency in addition to 121.5 MHz.

3. COSPAS-SARSAT Satellite System and ELT Equipment#

System description. The COSPAS-SARSAT system provides the primary independent distress alerting channel, separate from the ATS alerting chain. It is the insurance mechanism: an ELT activation reaches the RCC even if the aircraft never made an emergency broadcast and the ATS alerting chain was never triggered.

Three satellite segments.

MEOSAR is the current-generation capability. Multiple satellites in view at any time provide rapid detection and near-real-time forwarding. Position accuracy is within 100 m when the ELT has an internal GNSS receiver.

ELT carriage requirements. Aircraft carriage requirements are in Annex 6, Parts I (large transport aeroplanes), II (general aviation), and III (helicopters). The general rule under Annex 6 Part II §2.4.12.3 is that all aeroplanes for which the individual certificate of airworthiness was first issued after 1 July 2008 shall carry at least one automatic ELT.

406 MHz specifics. The 406 MHz signal encodes:

• The 24-bit ICAO aircraft address (from the aircraft nationality mark and registration).
• GPS-derived position (if beacon is GPS-equipped).
• Beacon serial number.

This encoding allows the RCC to identify the aircraft from the COSPAS-SARSAT alert without requiring any voice contact, and — for GPS-equipped beacons — to have an accurate initial search area.

121.5 MHz role. The 121.5 MHz carrier is retained as the homing frequency: SAR aircraft home on 121.5 MHz signals once in the general vicinity of the distress site. COSPAS-SARSAT satellites no longer process 121.5 MHz signals for alerting (satellite monitoring of 121.5 MHz was terminated on 1 February 2009).

4. GADSS and LADR Integration#

GADSS autonomous distress tracking (ADT). Annex 6, Part I, Appendix 9 requires new large aeroplanes delivered after 1 January 2021 to be capable of autonomous distress tracking — transmitting aircraft position automatically during a distress condition without requiring crew action. This is distinct from normal ACARS or FANS position reporting.

LADR (Location of Aircraft in Distress Repository). ADT transmissions are deposited in the LADR, a global repository accessible to authorized RCCs. Annex 12 §2.3.7 (Amendment 19) makes LADR subscription mandatory for each RCC. The LADR enables the RCC to query the last-known position of a large aeroplane in distress from the moment DETRESFA is declared.

Complementarity with COSPAS-SARSAT. GADSS/LADR covers large aeroplanes (Annex 6 Part I scope). COSPAS- SARSAT covers all aircraft equipped with a 406 MHz ELT. The two systems together provide layered, complementary position information: COSPAS-SARSAT for the alert trigger; LADR for the trajectory of the flight up to the distress event.

5. Procedures and IAMSAR Training#

IAMSAR Manual as the operational reference. The three volumes of Doc 9731 translate the high-level SARPs of Annex 12 into practical guidance. Volume II provides search planning methods (computing the datum, applying drift corrections, selecting search patterns); Volume III provides on-scene procedures for SAR units.

Training requirements.

• Regular training of all SAR personnel (Annex 12 §4.4).
• Joint exercises with SAR units of neighbouring States (§3.1.8).
• As of 26 November 2026, exercises must cover land and maritime environments and include both search and rescue elements away from an aerodrome.

ATS controller training. Doc 4444 requires ATS personnel to apply alerting service procedures including the 30-minute rule for INCERFA, the escalation criteria, and the standard notification format to the RCC. This is core competency for ATS ratings.

RCC personnel English proficiency. Annex 12 §2.3.4 recommends that RCC personnel involved in radiotelephony communications be proficient in English, enabling coordination with foreign SAR units and international RCCs.

6. Bilateral and Multilateral Cooperation Agreements#

Legal instruments. Bilateral or multilateral SAR agreements specify:

• Conditions for entry of foreign SAR units into the State's territory.
• Expedited customs and immigration clearance procedures.
• Resource-sharing arrangements (aircraft, vessels, personnel, equipment).
• Joint planning and exercise commitments.

Normative basis. Annex 12 §3.1.5 recommends such agreements. §3.1.6 recommends that RCCs be authorized to request and grant assistance without waiting for State-level approval — a critical operational simplification.

Regional plans. ICAO regional air navigation plans specify the SAR cooperation commitments for each region. States that have not formalized bilateral agreements may still invoke Annex 12 §3.1.3 for immediate entry in an actual emergency, but preparedness and response times are considerably improved where agreements exist.

References#

• Annex 12, Chapter 2, §2.1.1 and §2.1.1.2 — Legal framework and basic elements of SAR.
• Annex 12, Chapter 2, §2.3.3 to §2.3.7 — Staffing, language, LADR.
• Annex 12, Chapter 2, §2.4.1 — RCC communications requirements.
• Annex 12, Chapter 3, §3.1.5 to §3.1.7 — Cooperation agreements; RCC authority to request/grant aid.
• Annex 12, Chapter 3, §3.2.5 (as of 26 Nov 2026) — 24-hour SAR point of contact for COSPAS-SARSAT.
• Annex 12, Chapter 4, §4.4 — Training and exercises including Amendment 19 scope.
• Annex 6, Part II, §2.4.12 — ELT carriage requirements for general aviation.
• Annex 10, Volume III — ELT specifications (authoritative source — not further expanded in this library).
• Doc 9731 (IAMSAR Manual), Vols I–III — SAR procedures and training framework (authoritative source — not in local library).
• Doc 10165 (GADSS Manual) — LADR access guidance (authoritative source — not in local library).
• https://www.cospas-sarsat.int/ - COSPAS-SARSAT system documentation; MEOSAR status; C/S T.012 channel plan.

The performance lens for SAR#

SAR performance is measured against the ICAO Key Performance Area (KPA) framework from Doc 9854 (Global ATM Operational Concept) and Doc 9883 (Manual on Global Performance of the Air Navigation System). SAR is primarily a Safety service, but it also involves Participation (cross-border cooperation), Efficiency (response time), and Access and Equity (universal service provision). Cost-effectiveness matters for States planning SAR infrastructure investment.

Key Performance Indicators (KPIs) for SAR#

The following KPIs are used in SAR appraisals. They are operational indicators rather than regulatory compliance metrics.

KPA contribution matrix#

The matrix scores each ICAO KPA by its relevance to SAR performance (1 = some relevance, 2 = clear relevance, 3 = primary KPA). Scores reflect SAR's intrinsic character as a safety-critical, cooperative service with direct efficiency and access dimensions.

Scoring key: 1 = some relevance; 2 = clear relevance; 3 = primary KPA.

Performance objectives by domain#

Safety (primary KPA)#

Objective. Ensure that every person aboard an aircraft in distress receives a SAR response within the shortest practicable time, with a search area accurate enough to locate survivors while they are still viable.

Contributing factors:

• INCERFA declared within 30 minutes of missed contact (Annex 11 §5.2.1(a)) — the 30-minute rule is the normative minimum.
• COSPAS-SARSAT MEOSAR alert latency under 5 minutes from ELT activation to MCC forwarding.
• LADR position available for all large-aeroplane DETRESFA events.
• SAR unit dispatch within 30 minutes of DETRESFA at Category 1 RCCs (IAMSAR target — not in local library).

Measurement. Post-event appraisals per Annex 12 §5.9.2; regional aggregation through ICAO SAR implementation reviews.

Access and Equity (co-primary KPA)#

Objective. Universal SAR coverage — no point on Earth is outside an SRR with an associated RCC, regardless of whether the distress site is over territory, high seas, or remote terrain.

Contributing factors:

• Complete global SRR delineation with no gaps or overlaps.
• Functional RCCs in all SRRs, including States with limited resources using cooperative or shared arrangements.
• COSPAS-SARSAT providing independent alerting even where ATS coverage is absent (oceanic, polar, remote).
• Bilateral agreements enabling rapid cross-border response.

Measurement. ICAO Universal Safety Oversight Audit Programme (USOAP) assesses SAR infrastructure in each State; RCC directory completeness reviewed by ICAO.

Interoperability (secondary KPA, critical for cross-border)#

Objective. SAR units of different States can operate in each other's SRRs with common procedures, common signals, and mutual comprehension.

Contributing factors:

• IAMSAR Manual as the common procedural reference (joint ICAO/IMO).
• Standard visual signals in Annex 12 Appendix.
• English as the recommended RCC radiotelephony language (§2.3.4).
• Standard INCERFA/ALERFA/DETRESFA notification format (Annex 11 §5.2.2).
• Formalized bilateral entry agreements.

Measurement. Post-exercise reviews; number of cross-border SAR operations completed without procedural friction.

Participation (secondary KPA)#

Objective. States actively engage in regional SAR planning, joint exercises, liaison visits, and information sharing with ICAO.

Contributing factors:

• Joint training exercises with neighbouring States (Annex 12 §3.1.8).
• Periodic liaison visits by RCC personnel to adjacent RCCs (§3.1.9).
• Submission of operational appraisals to ICAO for dissemination (§5.9.2).
• Active engagement in ICAO/IMO Joint Working Group on Harmonization of Aeronautical and Maritime SAR (JWG-SAR).

Cost-effectiveness#

Objective. SAR infrastructure is dimensioned and resourced to deliver the safety outcomes at reasonable cost to the State, using shared assets, cooperative arrangements, and technology (COSPAS- SARSAT, GADSS/LADR) to reduce the need for dense national SAR-unit networks.

Contributing factors:

• COSPAS-SARSAT provides global alert coverage with no per-State satellite investment required.
• Cooperative SRR arrangements reduce the cost burden for small or developing States.
• LADR position accuracy reduces search time, reducing fuel and crew-hours per SAR event.

References#

• Doc 9854 (Global ATM Operational Concept), Chapter 2, §2.14 — KPA definitions.
• Doc 9883 (Manual on Global Performance of the Air Navigation System) — KPI framework (authoritative source — not in local library).
• Annex 12, Chapter 5, §5.9.1 and §5.9.2 — RCC performance records and appraisals.
• Doc 9731 (IAMSAR Manual), Vol I — SAR system performance and efficiency concepts (authoritative source — not in local library).
• https://www.cospas-sarsat.int/ - COSPAS-SARSAT performance data and MEOSAR constellation status.

Two timelines to keep distinct#

1. Annex 12 edition and amendment timeline — when ICAO adopted the normative SAR framework and how it has evolved.
2. COSPAS-SARSAT technology timeline — the satellite alerting system milestones, from 121.5 MHz to 406 MHz to MEOSAR.

A third dimension — GADSS integration — links SAR to the broader ICAO autonomous distress tracking framework introduced in Annex 6.

Annex 12 edition and amendment history#

COSPAS-SARSAT technology timeline#

GADSS and LADR integration timeline#

IAMSAR Manual timeline#

Key date — 26 November 2026#

Amendment 19 Part B becomes applicable on 26 November 2026. The changes applicable from that date include:

• Revised SAR operations at distress scene (Section 5.6 renamed).
• Updated intercepted distress transmission procedures (§5.7).
• 24-hour SAR point of contact for COSPAS-SARSAT acknowledgement (§3.2.5, strengthened requirement).
• Expanded training and exercise requirements (§4.4).
• Updated vessel communications provisions (121.5/123.1 MHz; Channel 16).
• Visual signals referenced in IAMSAR Vol III.
• Aircraft position and speed of ships in preparatory information (§4.1.2(e), (f)) become mandatory (upgraded from Recommendation).

References#

• Annex 12, Foreword, Table A — Complete amendment history from 1st Edition (1950) to Amendment 19 (2024).
• Annex 12, Amendment 19, adopted 18 March 2024 — GADSS/LADR provisions; 9th Edition applicable 28 November 2024 / 26 November 2026.
• Doc 9731 (IAMSAR Manual), Preface — Joint ICAO/IMO authorship; publication history (authoritative source — not in local library).
• https://www.cospas-sarsat.int/ - COSPAS-SARSAT system history, MEOSAR operational status, 406 MHz beacon programme.

Primary ICAO normative sources#

• Annex 12 (Search and Rescue), 9th Edition (Amendment 19, 2024) — the primary normative source for SAR; applicable 28 November 2024 with provisions in Amendment 19 Part B applicable 26 November 2026.
• Annex 12, Chapter 1 — Definitions: alert phase, alerting post, distress phase, emergency phase, JRCC, RCC, RSC, SRR, uncertainty phase, SAR unit, SAR aircraft, SAR facility, SAR service.
• Annex 12, Chapter 2 — Organization: SAR services, SRR delineation, RCC/RSC establishment, communications requirements, SAR unit designation, equipment requirements.
• Annex 12, Chapter 3 — Cooperation: inter-State cooperation, entry of foreign SAR units, COSPAS-SARSAT point of contact, information dissemination.
• Annex 12, Chapter 4 — Preparatory measures: information requirements, plans of operation, training and exercises, accident sites.
• Annex 12, Chapter 5 — Operating procedures: phase-by-phase RCC actions; on-scene coordination; pilot procedures for intercepted distress transmission; SAR signals.
• Annex 12, Appendix — Air-to-surface and surface-to-air visual signals for SAR operations.
• Annex 12, Foreword, Table A — Complete amendment history from 1st Edition (1950) through Amendment 19 (2024).

ICAO related Annexes and PANS#

• Annex 11 (Air Traffic Services), Chapter 5, §5.1 to §5.2.3 — Alerting service SARPs: application, notification of RCCs, phase triggers, notification content; LADR reference.
• Annex 11, Chapter 2, §2.3.3 — Alerting service as one of the three ATS components.
• Doc 4444 (PANS-ATM), Chapter 1 — Definitions of INCERFA, ALERFA, DETRESFA, alerting service.
• Doc 4444, Chapter 9, §9.2 — Alerting service procedures: 30-minute rule; INCERFA/ALERFA/DETRESFA escalation criteria; coordination in multi-FIR situations.
• Doc 4444, Chapter 4, §4.2 — Responsibility for flight information service and alerting service.
• Annex 6, Part I, Appendix 9 — Autonomous distress tracking (ADT) requirement for large aeroplanes (first certificate of airworthiness issued on or after 1 January 2021).
• Annex 6, Part II, §2.4.12 — ELT carriage requirements for general aviation aeroplanes.
• Annex 6, Part III — ELT carriage requirements for helicopters.
• Annex 10, Volume III — Technical specifications for ELTs including 406 MHz and 121.5 MHz (local library available; ELT chapter not further expanded in this folder).

ICAO guidance documents#

• Doc 9731 (IAMSAR Manual), Vol I — Organization and Management: SAR system design, RCC establishment, cooperative arrangements, training (authoritative source — not in local library).
• Doc 9731 (IAMSAR Manual), Vol II — Mission Co-ordination: SAR operation stages, search planning, datum computation, search patterns (authoritative source — not in local library).
• Doc 9731 (IAMSAR Manual), Vol III — Mobile Facilities: on-scene procedures, visual signals, SAR communications (authoritative source — not in local library).
• Doc 10165 (Manual on Global Aeronautical Distress and Safety System, GADSS) — LADR access guidance; OPS Control Directory procedures; ADT system architecture (authoritative source — not in local library).
• Doc 9756 (Manual of Aircraft Accident and Incident Investigation), Part I — Guidance on occupational health at accident sites; referenced in Annex 12 §4.5.1 (Amendment 19).
• Doc 7030 (Regional Supplementary Procedures) — Regional SAR procedures applying Annex 12 SARPs (authoritative source — not in local library).

External authoritative sources#

• https://www.cospas-sarsat.int/ - COSPAS-SARSAT international programme; system description; MCC directory; MEOSAR status; C/S T.012 406 MHz channel plan.
• https://www.icao.int/safety/search-and-rescue/ - ICAO SAR page; Annex 12 and IAMSAR Manual overview; regional SAR implementation resources.
• https://www.imo.org/en/OurWork/Safety/Pages/SearchandRescue.aspx - IMO SAR page; SOLAS Chapter V; IAMSAR joint mandate; maritime SAR resources.
• https://store.icao.int/ - ICAO store; Annex 12 and IAMSAR Manual (Doc 9731) purchase/download.