AD 2010-17-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Rolls-Royce plc (RR) RB211-22B and RB211-524 Series Turbofan Engines |
Unsafe Condition
Several low pressure turbine (LPT) shafts have been found with cracks originating from the rear cooling air holes. The cracks have been found to initiate from corrosion pits. Propagation of a crack from the rear cooling air holes may result in shaft failure and subsequently in an uncontained Low Pressure Turbine failure.
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Required Actions
Inspect the LPT shaft using paragraphs 3.A.(1)(a) through 3.A.(4)(l) of the accomplishment instructions of Rolls-Royce Service Bulletin RB.211-72-AF336. Remove cracked LPT shafts from service before further flight. Reinspect the LPT shaft according to the specified schedule in Table 1 of this AD.
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Compliance Time
Within the next engine shop visit after the effective date of this AD.
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Affected Aircraft
Rolls-Royce plc RB211-22B series and RB211-524B4-D-02, RB211-524D4-19, RB211-524D4-39, RB211-524D4-B-19, RB211-524D4-B-39, RB211-524D4X-19, and RB211-524D4X-B-19 model turbofan engines installed on, but not limited to, Boeing 747 series and Lockheed L-1011 series airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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