Flight Controls – Slat Transmission Shafts / Slat Power Control Unit Torque Sensing Units – Inspection
Superseded. Comply with 2021-0275, which replaces this document.
- Published
- Effective
- Deadline
- Replaces
- 2020-0163R2
- Replaces
- 2021-0053
- Replaces
- 2020-0163
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Operators of Airbus A350-941 and A350-1041 aeroplanes with affected PCUs must perform detailed inspections and health checks of the slat transmission systems within specified flight cycle thresholds or timeframes, as outlined in the directive's compliance table. Repetitive health checks must continue according to Airbus instructions until affected parts are replaced with serviceable ones. Any discrepancies found during inspections require immediate corrective action before further flight.
Summary
EASA Airworthiness Directive 2021-0053R1 is an updated safety directive addressing Airbus A350-941 and A350-1041 aeroplanes equipped with specific slat power control units (PCU) having part numbers 4785A0000-04 or 4785A0000-05. The directive mandates inspections and repetitive health checks of the slat transmission shafts and PCU torque sensing units to prevent potential slat system jams caused by excessive wear. It aims to ensure continued airworthiness by requiring corrective actions if discrepancies are found.
What changed
EASA Airworthiness Directive 2021-0053R1 revises the previous AD 2021-0053 by clarifying definitions, amending inspection notes and compliance tables, and introducing a definition of 'serviceable part'. It also refines the required actions on affected parts and updates compliance instructions based on operator feedback. The directive retains the requirement for repetitive health checks and inspection procedures as specified in the Airbus Alert Operators Transmission documents.
Why it matters
This directive is critical for aviation professionals because it addresses a safety risk involving slat system jams that could reduce aircraft control during flight. Operators and maintenance teams must comply to prevent potential double shaft disconnections or ruptures in the slat system. Ensuring compliance helps maintain aircraft safety, avoid operational disruptions, and meet regulatory requirements for continuing airworthiness.
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