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Fri, May 27, 2011

AD: Rolls Royce

AD NUMBER: 2011-11-08

MANUFACTURER: Aircraft Rolls-Royce plc (RR) RB211-535 Series Turbofan Engines
SUBJECT: Airworthiness Directive 2011-11-08

SUMMARY: This AD results from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as:

There have been several findings of cracking at the firtrees of LP Turbine discs. Fatigue crack initiation and subsequent crack propagation at the firtree may result in multiple LP Turbine blade release. The latter may potentially be beyond the containment capabilities of the engine casings. Thus, cracking at the firtrees of LP Turbine discs constitutes a potentially unsafe condition.

The FAA has issued this AD to detect cracks in the low-pressure (LP) turbine stage 1, 2, and 3 discs, which could result in an uncontained release of LP turbine blades and damage to the airplane.

FMI: http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAD.nsf/0/7E5AC6C442D2FD238625789C0046FDA7?OpenDocument

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