AD 75-05-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT8D-1 | PRATT & WHITNEY AIRCRAFT Model JT8D Engines |
| engine | Pratt & Whitney Division | JT8D-11 | PRATT & WHITNEY AIRCRAFT Model JT8D Engines |
| engine | Pratt & Whitney Division | JT8D-15 | PRATT & WHITNEY AIRCRAFT Model JT8D Engines |
| engine | Pratt & Whitney Division | JT8D-15A | PRATT & WHITNEY AIRCRAFT Model JT8D Engines |
| engine | Pratt & Whitney Division | JT8D-17 | PRATT & WHITNEY AIRCRAFT Model JT8D Engines |
| engine | Pratt & Whitney Division | JT8D-17A | PRATT & WHITNEY AIRCRAFT Model JT8D Engines |
| engine | Pratt & Whitney Division | JT8D-17AR | PRATT & WHITNEY AIRCRAFT Model JT8D Engines |
| engine | Pratt & Whitney Division | JT8D-17R | PRATT & WHITNEY AIRCRAFT Model JT8D Engines |
| engine | Pratt & Whitney Division | JT8D-1A | PRATT & WHITNEY AIRCRAFT Model JT8D Engines |
| engine | Pratt & Whitney Division | JT8D-1B | PRATT & WHITNEY AIRCRAFT Model JT8D Engines |
Unsafe Condition
Fuel manifold leakage due to improperly torqued 'B' nuts on fuel manifolds with specific part numbers (629141, 629148, 629154, 699155, 735780, 735781).
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Required Actions
Retorque fuel manifold 'B' nuts per Service Bulletin 4389 or Engine Manual No. 481672 within specified time limits. Conduct daily inspections for residual fuel wetness or staining and remove engines from service if leakage is found until retorquing is completed.
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Compliance Time
Within the next 1500 hours time in service after March 12, 1976, for single or double torqued 'B' nuts; within 1500 hours time in service after February 24, 1977, for quadruple torqued 'B' nuts. Adjustments may be made by the FAA Chief, Engineering and Manufacturing Branch.
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Affected Aircraft
Pratt & Whitney Aircraft JT8D model engines with fuel manifolds having part numbers 629141, 629148, 629154, 699155, 735780, or 735781, where 'B' nuts have not been retorqued in service.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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