AD 2025-17-15
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | ATR-GIE | Avions de Transport Régional | Airworthiness Directives; ATR-GIE Avions de Transport Régional Airplanes |
Unsafe Condition
A review of the master minimum equipment list (MMEL) identified that, under the provisions of MMEL item 29-11-01 for dispatch with a failed main hydraulic (HYD) pump, specifically the GREEN HYD Pump, a failure of the DC EMER BUS could lead to multiple system losses, including loss of control of the BLUE HYD Pump (electrically controlled by the DC EMER BUS), loss of nose wheel steering (powered by the DC EMER BUS), and complete loss of control of the rudder travel limitation unit (TLU) in both auto and manual modes. These failures could result in reduced airplane controllability on the ground during landing.
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Required Actions
Revising the existing minimum equipment list (MEL) to incorporate new provisions to ensure appropriate actions are taken when the airplane is dispatched with one inoperative main hydraulic pump. Inform all flight crews of revisions to the MEL, and thereafter operate the aeroplane accordingly.
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Compliance Time
Before further flight
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Affected Aircraft
ATR--GIE Avions de Transport Régional Model ATR42-500 and ATR72-212A airplanes with the new avionics suite (glass flightdeck) installed by modification 05948.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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