AD 2012-24-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce | plc | Airworthiness Directives; Rolls-Royce plc Turbofan Engines |
Unsafe Condition
Missing spherical seat between the oil transfer tube and the LPT bearing housing end cover can cause fracture of the oil transfer tube, leading to reduced oil flow and subsequent damage to the LP and IP bearings, potentially resulting in uncontained engine failure and damage to the airplane.
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Required Actions
Inspect the low pressure turbine (LPT) bearing housing end cover assembly using RR Alert Non-Modification Service Bulletin (NMSB) RB.211-72-AH051 and RB.211-72-H056. Replace the assembly if the spherical seat is missing.
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Compliance Time
Before further flight
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Affected Aircraft
Rolls-Royce plc RB211-Trent 970-84 and 972-84 series turbofan engines, all serial numbers.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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