AD 2021-04-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | SAS | Airworthiness Directives; Airbus SAS Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Airbus SAS Airplanes |
Unsafe Condition
ram air turbine (RAT) performance that may be below the expected (certificated) level when the landing gear is extended, which could lead to partial or total loss of RAT electrical power generation when the RAT is deployed in an emergency situation, possibly resulting in reduced control of the airplane.
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Required Actions
installing flight control and guidance system (FCGS) software (SW) X11 Standard (STD), modifying the electrical power supply of the air generation system (AGS) ram air outlet door actuators, and expanding the applicability by adding airplanes, as specified in a European Union Aviation Safety Agency (EASA) AD.
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Compliance Time
Within 10 months after March 12, 2020
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Affected Aircraft
Airbus SAS Model A350-941 airplanes
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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