AD 2008-25-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Rolls-Royce plc RB211 Trent 500 Series Turbofan Engines |
| engine | Rolls-Royce | plc RB211 Trent 500 Series | Airworthiness Directives; Rolls-Royce plc RB211 Trent 500 Series Turbofan Engines |
Unsafe Condition
Recent analysis of the low-pressure turbine (LPT) discs 1-5 concluded that it is necessary to reduce the declared safe cyclic life of all Trent 500 LPT stage 3 discs, part number FK29581, to prevent an uncontained failure of the LPT stage 3 disc, resulting in damage to the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove LPT stage 3 discs, part number FK29581, from service before reaching the new reduced declared safe cyclic life of 7,990 cycles-since-new (CSN). Do not install an LPT stage 3 disc, part number FK29581, onto any engine unless it has been verified that the disc has not yet accumulated 7,990 CSN.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before reaching the new reduced declared safe cyclic life of 7,990 CSN.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Rolls-Royce plc RB211 Trent 553-61, 553A2-61, 556-61, 556A2-61, 556B-61, 556B2-61, 560-61, and 560A2-61 turbofan engines with a low-pressure turbine (LPT) stage 3 disc, part number FK29581, installed. These engines are installed on, but not limited to, Airbus A340-500 and A340-600 series airplanes.
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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