EASA SIB 2009-33: Amendment of Cabin Crew Procedures for the Deployment of Oxygen Masks in the Cabin

What to do

Operators should review and update their operating manuals and relevant check-lists to incorporate the recommended cabin crew notification procedures regarding oxygen mask deployment. Training programs should be adjusted accordingly to ensure cabin crew understand and can execute these procedures promptly. There is no explicit compliance deadline stated in the bulletin.

Summary

EASA Safety Information Bulletin 2009-33 is an amendment to cabin crew procedures concerning the deployment of oxygen masks in the cabin, specifically referencing the Boeing 737-31S involved in the Helios Airways Flight HCY522 accident. The bulletin addresses the need for cabin crew to promptly notify flight crew when oxygen masks deploy due to loss or insufficient cabin pressure and to confirm that flight crew have donned their masks. This guidance applies to all pressurized aircraft used for commercial air transport.

What changed

The bulletin recommends amending operating manuals and check-lists to require the Cabin Chief or the cabin crew member nearest the flight deck to immediately inform the flight crew of oxygen mask deployment and confirm their use if the aircraft does not suspend climb, level off, or start a descent. This is an addition to existing procedures ensuring timely communication between cabin and flight crew during cabin pressure emergencies.

Why it matters

This amendment enhances safety by addressing a critical communication gap identified in the Helios Airways accident, reducing the risk of flight crew incapacitation due to hypoxia. For operators and compliance teams, it ensures procedures align with best practices for emergency oxygen use, supporting safer flight operations and regulatory compliance. It also helps cabin crew understand their vital role in monitoring and responding to cabin pressure events.

What to do

Summary

What changed

Why it matters

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