Flight Controls – Trimmable Horizontal Stabilizer Actuator / Electric Load Sensing Device – Modification
Superseded. Comply with 2024-0016, which replaces this document.
- Published
- Effective
- Deadline
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of affected Airbus A330 and A340 aircraft must install the ELSD wiring and activate the ELSD within 48 months from the effective date of 22 March 2022. Group 1 aircraft require wiring installation per specified service bulletins and repair forms, while both Group 1 and Group 2 aircraft must complete ELSD installation and activation as instructed.
Summary
EASA Airworthiness Directive 2022-0039 is an airworthiness directive issued by the European Union Aviation Safety Agency affecting Airbus A330 and A340 aeroplanes. It addresses a safety issue related to the Trimmable Horizontal Stabilizer Actuator (THSA) and requires modifications to the electric load sensing device system on these aircraft models.
What changed
This directive introduces a mandatory modification to the THSA installation by requiring the installation and activation of an Electric Load Sensing Device (ELSD) to detect secondary load path engagement even if the actuator does not stall. It also mandates wiring installation for the ELSD on certain aircraft groups and updates previous inspection requirements with a more reliable detection system.
Why it matters
This directive is critical for aviation professionals because it enhances flight safety by preventing potential mechanical disconnection of the THSA, which could lead to loss of aircraft control. Operators and maintenance organizations must ensure compliance to avoid unsafe conditions and maintain regulatory airworthiness standards.
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