EASA SIB 2011-19: WITHDRAWN - AmSafe Restraint Systems - Jammed Connector in a Rotary Buckle

What to do

Operators should inform all crew members about the potential jamming issue with the rotary buckle. In emergencies, if the belt cannot be released, it should be cut; in non-emergency situations, the belt should be detached from the seat fitting. Crews must not attempt to force open the buckle. Affected restraint systems should be removed from service and sent to AmSafe for further analysis. No specific compliance deadline is provided.

Summary

EASA Safety Information Bulletin 2011-19 is an informational bulletin addressing a reported issue with the AmSafe Restraint Systems rotary buckle, part number 504928-405, used in various AmSafe restraint system part numbers installed on helicopters and fixed-wing aircraft. The bulletin highlights a case where a passenger could not release the pelvic connector on an AS.365 N3 Dauphin helicopter during a non-emergency landing. Although the cause of the jammed connector has not been determined, EASA does not consider this an unsafe condition requiring an Airworthiness Directive.

What changed

This bulletin introduces awareness of a jamming problem in the rotary buckle of AmSafe restraint systems without mandating regulatory action. It provides recommendations for operators to manage the issue safely and to report affected restraint systems to AmSafe for further investigation. No new compliance mandates or Airworthiness Directives are issued as a result of this bulletin.

Why it matters

This information is important for aviation professionals because it highlights a potential safety concern with restraint systems that could affect passenger safety during emergency or non-emergency situations. Operators and maintenance teams need to be aware of the issue to ensure proper handling and to avoid attempts to forcibly release jammed buckles, which could cause injury or damage. It also guides compliance teams on the non-mandatory nature of the recommendations while emphasizing reporting and investigation procedures.