AD 2013-04-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce | plc | Airworthiness Directives; Rolls-Royce plc Turbofan Engines |
Unsafe Condition
Failure of the attachment rivets, which may result in release of the thrust reverser unit (TRU) from the engine.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove and repair TRUs that experienced a cowl gearbox stubshaft failure with subsequent repair of the fixed structure to Engine Manual repair No. FRS5887. Also remove and repair TRUs previously repaired at the front ring with additional rivets using Engine Manual repair No. FRS5887 Part 2, and that have not had Engine Manual repair Nos. FRS4976 and FRS6669 applied to the rear ring at the No. 2 or No. 3 gearbox position.
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Compliance Time
Within the next scheduled engine removal
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Affected Aircraft
Rolls-Royce plc RB211-524 series turbofan engines with thrust reverser units (TRUs) that have a part number (P/N) specified in paragraph 1.A. of RR Alert Non-Modification Service Bulletin (NMSB) No. RB.211-78-AG084, Revision 7, dated November 23, 2012.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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