AD 2021-11-23
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | SAS | Airworthiness Directives; Airbus SAS Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Airbus SAS Airplanes |
Unsafe Condition
overheat failure mode of the hydraulic engine-driven pump (EDP), which may cause a fast temperature rise of the hydraulic fluid, and, if combined with an inoperative fuel tank inerting system, could lead to an uncontrolled overheat of the hydraulic fluid, possibly resulting in ignition of the fuel-air mixture of the affected fuel tank.
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Required Actions
revising the existing maintenance or inspection program, as applicable, to incorporate new or more restrictive airworthiness limitations, as specified in EASA AD 2020-0268, and, for certain airplanes, an update of the hydraulic monitoring system to include additional redundancy, by modifying the case-drain filter manifolds by installing new dual temperature sensors on the hydraulic EDP, as specified in Airbus Service Bulletin A350-29-P025, dated August 10, 2020, or A350-29-P027, dated November 24, 2020, or A350-29-P029, dated December 16, 2020.
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Compliance Time
Before further flight
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Affected Aircraft
Airbus SAS Model A350-941 and -1041 airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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