EASA AD CF-2020-52
Landing Gear — Missing Secondary Locking Device on Main Landing Gear Side Stay Actuator
Summary
The Canadian Airworthiness Directive CF-2020-52 addresses a missing secondary locking device on the main landing gear side stay actuator for Bombardier Inc. BD-100-1A10 aircraft with serial numbers 20003 to 20780. This directive mandates inspection and, if necessary, installation of a safety wire on the castellated nut of the main landing gear side stay actuator. The directive ensures compliance with Canadian Aviation Regulations to maintain aircraft safety.
What Changed
CF-2020-52 introduces a new requirement to inspect the castellated nut on the main landing gear side stay actuator for the presence of a safety wire, which acts as a secondary locking device. If the safety wire is missing, it must be installed according to the specified Bombardier service bulletins. This directive addresses the absence of manufacturing instructions for installing the safety wire, which could lead to nut loosening and potential landing gear collapse.
Why It Matters
This directive is critical for operators and maintenance organizations to prevent the risk of main landing gear failure due to a loose or missing locking wire on the actuator nut. Ensuring the secondary locking device is installed reduces the chance of undetected nut loss and subsequent landing gear collapse, thereby enhancing flight safety and regulatory compliance. Compliance teams must track and enforce this inspection to avoid regulatory violations and maintain airworthiness.
What To Do
Operators of affected Bombardier BD-100-1A10 aircraft must inspect the castellated nut on both left and right main landing gear side stay actuators within 12 months from December 14, 2020. If the safety wire is missing, it must be installed following the procedures in Bombardier Service Bulletin 100-32-36 for CL300 or 350-32-012 for CL350, as approved by Transport Canada. Documentation of compliance should be maintained and reported as required.
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