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Airworthiness Directive:

Airworthiness Directives; Rolls-Royce plc (RR) RB211-524 Series and RB211 Trent 500, 700,
and 800 Series Turbofan Engines

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule.

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SUMMARY: We are adopting a new airworthiness directive (AD) for the products listed above. 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:

During manufacture of a number of HP Compressor Stage 1 and 2 discs with axial
dovetail slots, anomalies at the disc post corners have been found. Fatigue crack
initiation and subsequent crack propagation at the disc post may result in release of
two blades and the disc post. This may potentially be beyond the containment
capabilities of the engine casings. Thus, these anomalies present at the disc posts
constitute a potentially unsafe condition.

We are issuing this AD to detect cracks in the high-pressure compressor (HPC) Stage 1 and 2 disc
posts, which could result in failure of the disc post and release of HPC blades, release of uncontained
engine debris, and damage to the airplane.