Flight Controls – Uncommanded Flap Extension
Superseded. A newer version replaces this document.
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected Bombardier Challenger 600 series aircraft must perform the initial operational test of the flap control system within 100 flight hours or 15 months from the effective date of 2023-02-24, whichever occurs first. Subsequently, repeat tests must be conducted at specified intervals depending on the aircraft model and serial number, following the instructions in the applicable Bombardier service bulletins. Contact Transport Canada for further guidance if needed.
Summary
Canadian Airworthiness Directive CF-2023-07 addresses an uncommanded flap extension issue affecting Bombardier Inc. CL-600-1A11, CL-600-2A12, and CL-600-2B16 aircraft across all serial numbers. The directive mandates operational testing of the flap control system to verify the functionality of retract relays following an incident involving unexpected flap movement during climb. This AD aims to ensure continued safe operation of these Challenger series aircraft.
What changed
This new Airworthiness Directive introduces mandatory initial and repeat operational tests of the inboard and outboard flaps to detect failed retract relays in the flap control system. It requires compliance with specific Bombardier service bulletins for different aircraft serial number ranges. The directive also sets intervals for repeat testing to maintain flap system reliability.
Why it matters
This AD is critical for aviation professionals as it addresses a potential safety hazard that could lead to loss of aircraft control due to uncommanded flap extension. Operators and maintenance organizations must implement these tests to detect and mitigate flap control system failures, ensuring regulatory compliance and flight safety. Failure to comply could result in unsafe flight conditions and regulatory penalties.
More for Bombardier CL-600 (Challenger)
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- EASA AD CF-2025-51R1Flight Controls — Uncommanded and Unarrested Flap MovementDec 2, 2025
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- EASA AD CF-2025-06Auxiliary Power Unit (APU) — APU Muffler Drainage Blockage Causing Fuel Leakage AccumulationJan 27, 2025
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