Flight Controls — Incorrectly Installed Horizontal Stabilizer Trim Actuator No-Back Pawl
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of Bombardier BD-100-1A10 aircraft must, within 60 months from the effective date of October 5, 2022, verify the HSTA part and serial numbers through records or visual inspection. If required, they must inspect the no-back pawl installation, add modification plates, or replace the HSTA before further flight. Installation of non-compliant HSTA parts is prohibited from the effective date onward.
Summary
Canadian Airworthiness Directive CF-2022-55 addresses a design deficiency in the horizontal stabilizer trim actuator (HSTA) no-back pawl installation on Bombardier BD-100-1A10 aircraft, serial numbers 20003 and later. This directive mandates inspection and corrective actions to ensure proper installation of the no-back pawl to prevent potential loss of the aircraft. It applies specifically to certain HSTA part and serial numbers identified in Bombardier Service Bulletins SB 100-27-20 and SB 350-27-009.
What changed
CF-2022-55 introduces mandatory inspections and rectifications of the no-back pawl installation in the HSTA for affected Bombardier BD-100-1A10 aircraft. It requires operators to check maintenance records or perform visual inspections, followed by corrective actions such as re-identification, modification plate addition, or replacement of the HSTA if deficiencies are found. The directive also prohibits installation of certain HSTA parts without required modifications.
Why it matters
This directive is critical for aviation professionals to prevent failure of the horizontal stabilizer trim actuator's no-back mechanism, which is essential for flight control safety. Ensuring compliance reduces the risk of actuator back driving and potential loss of aircraft control. Operators, maintenance organizations, and compliance teams must address this to maintain airworthiness and regulatory compliance.
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
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