EASA AD CF-2023-68R1
Stabilizer — Horizontal Stabilizer — Jamming of the Horizontal Stabilizer Trim Actuator
Summary
Airworthiness Directive CF-2023-68R1 addresses the jamming issue of the Horizontal Stabilizer Trim Actuator (HSTA) on Airbus Canada Limited Partnership BD-500-1A10 and BD-500-1A11 aircraft. The directive mandates lubrication and inspection procedures to prevent water intrusion and freezing in the HSTA ballscrew assembly, which can cause loss of pitch trim capability. This directive applies to specific serial numbers of the affected models and updates previous requirements.
What Changed
CF-2023-68R1 revises the original AD CF-2023-68 by clarifying the compliance times for aircraft that have not previously undergone HSTA lubrication since entry into service. It maintains the lubrication requirements but specifies initial and repetitive lubrication intervals more clearly to ensure consistent compliance.
Why It Matters
This directive is critical for operators and maintenance teams to prevent potential jamming of the horizontal stabilizer trim actuator, which could lead to loss of pitch control during flight. Ensuring timely lubrication reduces the risk of water intrusion and freezing, enhancing flight safety and regulatory compliance. Maintenance programs must incorporate these updated intervals to avoid operational disruptions and regulatory penalties.
What To Do
Operators must perform the initial HSTA lubrication according to ACLP Service Bulletin BD500-274006 within 1100 flight hours or 12 months from the last lubrication or entry into service, whichever applies. Subsequently, lubrication must be repeated every 1000 flight hours or 12 months. Compliance with these tasks must be documented and completed by the effective date of 14 May 2024.
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