Doors — Passenger Door — Detent Mechanism Aircraft Maintenance Manual Procedure
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AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators and maintenance personnel must use the revised AMM Task 52-11-00-720-801 dated 16 August 2022 or later when performing the functional test of the passenger door mechanism as part of TLMC Item 52-11-00-201. They must comply with this directive within 30 days from the effective date of 27 April 2023 and must not use earlier versions of the AMM task dated 19 May 2022 or before.
Summary
Airworthiness Directive CF-2023-25 is a Canadian regulatory document addressing the passenger door detent mechanism on Bombardier Inc. BD-700-1A10 and BD-700-1A11 aircraft, serial numbers 9002 through 60065. It mandates revisions to the Aircraft Maintenance Manual procedure for the functional test of the passenger door mechanism to include inspections that were previously omitted. This directive aims to enhance safety by preventing latent failures that could lead to door opening during unpressurized flight.
What changed
CF-2023-25 introduces a revised Aircraft Maintenance Manual Task 52-11-00-720-801 dated 16 August 2022 or later, which adds inspections for the external handle detent and torque tube detent, as well as instructions to measure the force required to open the door handles. The directive prohibits the use of earlier versions of this AMM task dated 19 May 2022 or before when performing the related Time Limited Maintenance Check item.
Why it matters
This directive is critical for operators and maintenance organizations because it addresses a safety risk where undetected failures in the passenger door detent mechanisms could cause the main passenger door to open during flight. Compliance ensures that maintenance procedures effectively detect these latent failures, thereby maintaining aircraft safety and regulatory compliance.
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