Flight Controls — Trimmable Horizontal Stabilizer Actuator / Electric Load Sensing Device — Modification
- Published
- Effective
- Replaces
- 2024-0016
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected Airbus A330 and A340 aeroplanes must complete the ELSD wiring installation and activation within 48 months after 22 March 2022, following the updated Airbus SB1c and SB2 instructions. Additional corrective work is required within 15 months after the AD's effective date for aircraft previously modified with earlier service bulletin versions. Compliance with these modifications is mandatory to maintain airworthiness and operational approval.
Summary
EASA Airworthiness Directive 2025-0169 is an official regulatory document addressing modifications to the flight controls, specifically the Trimmable Horizontal Stabilizer Actuator (THSA) and Electric Load Sensing Device (ELSD) on Airbus A330 and A340 aeroplanes. This directive applies to various Airbus A330 models up to manufacturer serial number 1919 (excluding MSN 1915) and all Airbus A340-211, -212, -213, -311, -312, and -313 models. The AD mandates modifications to improve safety related to the THSA's secondary load path and the installation and activation of the ELSD.
What changed
EASA AD 2025-0169 supersedes the previous AD 2024-0016 and introduces updated service bulletin references, specifically Airbus SB1c revisions, requiring additional work on certain aeroplanes after prior modifications. It retains the core requirements of earlier ADs but mandates further corrective actions to ensure the ELSD wiring installation and activation are properly accomplished, addressing issues found with earlier service bulletin versions.
Why it matters
This AD is critical for aviation professionals because it addresses a potential unsafe condition where the THSA's secondary load path might engage without proper stall indication, risking mechanical disconnection and loss of aircraft control. Operators and maintenance organizations must comply to ensure continued airworthiness and flight safety. The directive also clarifies compliance timelines and additional work needed for aircraft previously modified under earlier service bulletins.
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