AD 2025-20-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus | SAS | Airworthiness Directives; Airbus SAS Airplanes |
Unsafe Condition
The combining spill valve (CSV) piston of the engine hydro-mechanical unit (HMU) is slow to close due to piston wear, which can cause an excess of fuel to be sent to the fuel nozzles, resulting in an N1 transient shaft overspeed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replacing certain HMUs with serviceable HMUs or improved HMUs before reaching a reduced life limit, and prohibiting the installation of affected parts under certain conditions.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Airbus SAS Model A350-1041 airplanes equipped with Rolls-Royce Trent XWB-97 engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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