Lost Communication & Emergency Descent Procedures · Part-SERA Update

Summary of Change

ED Decision 2024/007/R amends SERA.14083 and GM1 SERA.11001 to include:

• Clear procedural updates for lost communications under both IFR and VFR operations, including specific timelines and transponder code use.
• Detailed guidance for emergency descent procedures (EDP), including crew responsibilities and post-descent communication requirements.

Impact on Operators

• Flight crews must follow structured escalation protocols for lost COM, including alternate communication methods.
• IFR/VFR flights have distinct procedures, especially under VMC/IMC.
• Emergency descent steps must be rehearsed and reflected in SOPs, with defined PF and PM roles.
• Visual signal monitoring is emphasized near controlled aerodromes.

Lost Communication Procedures

• Initial Steps: Attempt re-establishment on the last frequency; try other ATS channels; use CPDLC, SATVOICE, or relay via other aircraft; set squawk 7600; follow procedures by flight type and condition.
• IFR under IMC: Maintain assigned speed/level for 20 minutes, follow flight plan, hold if necessary, and land within 30 minutes after ETA/EAT.
• IFR under VMC: Set squawk 7601, divert to the nearest suitable aerodrome, and report arrival.
• VFR flights: Stay in VMC, land at the nearest suitable aerodrome, and report arrival to ATS.
• Near controlled aerodromes: Monitor for visual/light signals from ATS.

Emergency Descent Procedures

• PF Responsibilities: Initiate descent and navigate as deemed appropriate, consider leaving airway, follow aircraft and company-specific SOPs.
• PM Responsibilities: Monitor for conflicting traffic (visual, TCAS), ensure SOP compliance, support coordination and communication.
• Post-Descent: Inform ATC of intentions, coordinate return or diversion, complete QRH actions and report as required.
• These procedures apply within EU and EASA FIRs; local rules prevail in non-SERA FIRs.

Affected Manuals

• Operations Manual Part A – General/Basic
• Operations Manual Part B – Aircraft Operating Procedures
• Operations Manual Part D – Flight Crew and Dispatcher Training

TRS Recommendation

TRS recommends operators review and revise all operational documentation to reflect these changes. Priority areas include:

• Proper use of transponder codes 7600/7601 per flight scenario.
• Timely transitions to holding or approach during lost COM under IFR.
• Clear crew tasking during emergency descent scenarios.
• Integration of procedures into training and safety programs.

Official Reference

ED Decision 2024/007/R implementing GM1 SERA.11001 and revised SERA.14083.

Further Information

Easy Access Rules for Standardised European Rules of the Air (SERA)