Landing Gear — Missing Secondary Locking Device on Main Landing Gear Side Stay Actuator
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
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.
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.
More for Bombardier BD-100
All 41- EASA AD CF-2025-58Time Limits/Maintenance Checks (TLMC) — Airworthiness Limitations (AWL)Nov 14, 2025
- EASA AD CF-2025-42Flight Controls — Horizontal Stabilizer — Autopilot Inability to Trim Horizontal StabilizerAug 28, 2025
- EASA SIB CASA-2025-03Flight Controls — Unannunciated Loss of Ground Lift Dump Spoilers due to Faulty Throttle Quadrant AssemblyApr 9, 2025
- EASA AD CF-2024-38Flight Controls — Horizontal Stabilizer Trim Actuator (HSTA) — Incomplete OverhaulNov 15, 2024
Get the next one by email
New ADs and bulletins for Bombardier BD-100, summarized like this page, every Monday.