AD 76-15-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce plc | RB211-22B-02 | ROLLS-ROYCE (1971) LIMITED Model RB211-22 Series Engines |
| engine | Rolls-Royce plc | RB211-22B/MOD 72-8700 | ROLLS-ROYCE (1971) LIMITED Model RB211-22 Series Engines |
| engine | Rolls-Royce plc | RB211-22C-02 | ROLLS-ROYCE (1971) LIMITED Model RB211-22 Series Engines |
Unsafe Condition
Cracks in the engine intermediate casing could result in inflight engine shutdown.
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Required Actions
Inspect the outside of the intermediate compressor casing for axial cracks using dye penetrant method at specified locations. Replace cracked casing with serviceable steel, Silcoset-coated aluminum, or aluminum casing if cracks reach, progress through, or approach critical locations. Repeat inspections at intervals not exceeding 150 to 300 cycles depending on modifications.
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Compliance Time
Within the next 50 hours engine time in service after the effective date, or before the accumulation of the lesser of 400 hours total engine time in service or 280 cycles, whichever occurs later.
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Affected Aircraft
Rolls-Royce RB211-22 series engines that do not incorporate Modifications 3310 and 3738, specifically models RB211-22B-02, RB211-22B/MOD 72-8700, and RB211-22C-02.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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