AD 87-25-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Rolls-Royce plc | RB211-535C-37 | ROLLS-ROYCE Models RB211-535C and -535E4 Series Engines |
| engine | Rolls-Royce plc | RB211-535E4-37 | ROLLS-ROYCE Models RB211-535C and -535E4 Series Engines |
| engine | Rolls-Royce plc | RB211-535E4-B-37 | ROLLS-ROYCE Models RB211-535C and -535E4 Series Engines |
| engine | Rolls-Royce plc | RB211-535E4-B-75 | ROLLS-ROYCE Models RB211-535C and -535E4 Series Engines |
Unsafe Condition
Low pressure (LP) fuel filter to high pressure (HP) pump tube frettage and cracking that can lead to fuel leaks and substantial fuel quantity loss.
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Required Actions
Replace specific fuel tubes with new configurations per Rolls-Royce Service Bulletins, visually inspect fuel tubes daily for frettage until clips are installed, and remove cracked or fretted assemblies before further flight. Dye penetrant inspect fuel tubes for cracks by the next 'A' check and at intervals not exceeding 1,000 hours or 'A' checks, as applicable. Install specified clips per subsequent Service Bulletins.
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Compliance Time
prior to further flight, not later than the next 'A' check after December 8, 1987, on or before March 31, 1988
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Affected Aircraft
Rolls-Royce RB211-535C and -535E4 series engines installed on Boeing 757 aircraft, including models RB211-535C-37, RB211-535E4-37, and others as specified in the directive.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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