AD 2012-02-11
Unsafe Condition
Cracks in the low-pressure (LP) turbine stage 1, 2, and 3 discs could result in an uncontained release of LP turbine blades and damage to the airplane.
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Required Actions
Perform a visual and fluorescent penetrant inspection (FPI) of the LP turbine stage 1, 2, and 3 discs at the next engine shop visit after the effective date. Repeat inspections at each engine shop visit after accumulating 1,500 cycles since the last inspection. Remove cracked discs from service.
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Compliance Time
Within the compliance times specified in the AD, unless already done.
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Affected Aircraft
Rolls-Royce plc RB211-535E4-37, -535E4-B-37, -535E4-B-75, and -535E4-C-37 turbofan engines.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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