EASA AD CF-2024-38
Flight Controls — Horizontal Stabilizer Trim Actuator (HSTA) — Incomplete Overhaul
Summary
Canadian Airworthiness Directive CF-2024-38 addresses an incomplete overhaul issue with the Horizontal Stabilizer Trim Actuator (HSTA) on Bombardier Inc. model BD-100-1A10 aircraft. The directive applies to HSTA part numbers C47100-004 and C47100-005 and requires verification and possible replacement of affected units. This directive aims to ensure continued safe flight by preventing potential failure of HSTA components.
What Changed
CF-2024-38 introduces a new requirement to verify the serial numbers of HSTAs installed on Bombardier BD-100-1A10 aircraft and mandates removal and replacement of units that were incompletely overhauled. It prohibits installation of affected HSTAs without a specific modification plate. The directive also sets compliance times based on component hours and flight cycles.
Why It Matters
This directive is critical for operators and maintenance organizations to prevent failure of the horizontal stabilizer trim actuator, which could lead to loss of control of the horizontal stabilizer and compromise flight safety. Compliance ensures regulatory adherence and reduces risk of in-service failures. Maintenance teams must carefully track affected serial numbers and adhere to replacement timelines.
What To Do
Operators must verify the serial numbers of HSTAs installed on BD-100-1A10 aircraft against the Bombardier Service Bulletins 100-27-23 and 350-27-014 within specified compliance times based on component hours or flight cycles. If affected, the HSTA must be removed and replaced accordingly. Installation of affected HSTAs without the required modification plate is prohibited from the effective date of 2024-11-26.