Flight Controls — Trimmable Horizontal Stabilizer Actuator — Modification
- Published
- Effective
- Deadline
- Replaces
- 2017-0237
- Replaces
- 2014-0147
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of Airbus A318, A319, A320, and A321 aircraft must modify the THSA by installing and activating the ELSD according to Airbus service bulletins A320-27-1245, A320-27-1246, A320-27-1247, and A320-27-1248. For Group 1 aircraft, ELSD activation must be completed within four years after 18 December 2017. Additionally, affected parts must not be installed, and the ELSD must remain activated to comply with this directive.
Summary
EASA Airworthiness Directive 2017-0237R1 is a regulatory update addressing the trimmable horizontal stabilizer actuator (THSA) on Airbus A318, A319, A320, and A321 aircraft. It focuses on modifications related to the Electrical Load Sensing Device (ELSD) installation and activation to ensure proper detection of primary load path failures in the THSA. This directive applies to all manufacturer serial numbers of the specified Airbus A320 Family models.
What changed
This revision removes the previous requirements for repetitive inspections and associated corrective actions of the THSA. It emphasizes the modification and activation of the ELSD on affected aircraft, streamlining compliance by eliminating redundant inspections. The directive also updates installation and activation instructions referencing the latest Airbus service bulletins.
Why it matters
For aviation professionals, this directive clarifies compliance requirements by focusing on ELSD installation and activation, which enhances safety by improving failure detection in the THSA system. Operators and maintenance organizations benefit from reduced inspection burdens while maintaining airworthiness standards. Compliance ensures continued safe operation of Airbus A320 Family aircraft and adherence to European Union aviation safety regulations.
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