EASA AD 2023-0191
Instruments — Angle of Attack Probe Electrical Routing — Inspection / Modification
Summary
EASA Airworthiness Directive 2023-0191 is an airworthiness directive addressing the electrical wiring routing of the left-hand and right-hand Angle of Attack (AOA) probes on ATR 42-200, ATR 42-300, and ATR 42-320 aeroplanes. It mandates inspections, modifications, and amendments to the Aircraft Flight Manual to prevent spurious stall warning activations caused by wiring damage. This directive applies to all manufacturer serial numbers of the specified ATR 42 models.
What Changed
EASA AD 2023-0191 supersedes AD 2023-0134 and retains its requirements while introducing additional work to ensure the correct modification of the AOA probe wiring. It requires installation of an AOA power supply unit and additional wiring modifications as per ATR Service Bulletin ATR42-31-0121 Revision 02. The directive also mandates removal of previous AFM amendments after modification completion.
Why It Matters
This directive is critical for aviation professionals because it addresses a safety issue that can cause spurious stall warnings leading to autopilot disconnection, stick pusher and shaker activations, and potential loss of aircraft control during critical flight phases. Operators and maintenance teams must ensure compliance to maintain aircraft airworthiness and prevent hazardous flight conditions. The AD also provides clear instructions for inspections, repairs, and modifications to mitigate these risks.
What To Do
Operators of affected ATR 42 aeroplanes must perform a visual inspection of the AOA probe wiring within specified timeframes and carry out any necessary repairs before further flight. Modifications to the wiring and installation of the AOA power supply unit must be completed within 12 to 14 months depending on the group classification of the aircraft. Additionally, the Aircraft Flight Manual must be amended or reverted as required, and all flight crews must be informed of these changes.
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