AD 2008-20-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Rolls-Royce plc RB211 Series Turbofan Engines |
| engine | Rolls-Royce | plc RB211 Series | Airworthiness Directives; Rolls-Royce plc RB211 Series Turbofan Engines |
Unsafe Condition
High pressure (HP) turbine discs have exhibited cracks in the disc rim, resulting from scores within the cooling air holes in the disc rim. These cracks could lead to uncontained disc failure and a potential unsafe condition for the aircraft.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform an initial eddy current inspection (ECI) of the HP turbine disc air cooling holes. For RB211-22B series engines, ECI the HP turbine disc based on cycles-since-new (CSN) and shop visit conditions as specified.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 500 cycles from the effective date of this AD or at the next shop visit where the HP turbine rotor is removed from the combustor outer casing, depending on CSN.
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Affected Aircraft
Rolls-Royce plc RB211-535E4 series, RB211-535E4-B series, RB211-535E4-C series, RB211-535C series, RB211-22B series, and RB211-524 series turbofan engines, except for engines with HP turbine discs incorporating RR Service Bulletin No. RB.211-72-C109 or RR SB No. RB.211-72-C762. These engines are installed on, but not limited to, Boeing 747, 757, and 767, Lockheed L-1011, and Tupolev Tu204 airplanes.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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