AD 2021-20-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | SAS | Airworthiness Directives; Airbus SAS Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Airbus SAS Airplanes |
Unsafe Condition
A disturbance of the air flow around the ram air turbine (RAT) 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 condition with the landing gear extended, and possibly result in reduced control of the airplane.
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Required Actions
Revising the existing airplane flight manual (AFM) and applicable corresponding operational procedures to provide procedures for all engines failure and landing gear gravity extension related to certain software, and installing Airbus temporary quick change (ATQC) V3 for the flight warning system (FWS) software (SW) standard (STD) 6/2.0, as specified in EASA AD 2021-0061.
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Compliance Time
Within 50 flight hours
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Affected Aircraft
Airbus SAS Model A350-941 and -1041 airplanes, certificated in any category, as identified in European Union Aviation Safety Agency (EASA) AD 2021-0061, dated March 5, 2021.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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