AD 69-01-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT3D-1 | PRATT & WHITNEY Models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-3, JT3D-3B and JT3D-7 Engines |
| engine | Pratt & Whitney Division | JT3D-1-MC6 | PRATT & WHITNEY Models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-3, JT3D-3B and JT3D-7 Engines |
| engine | Pratt & Whitney Division | JT3D-1-MC7 | PRATT & WHITNEY Models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-3, JT3D-3B and JT3D-7 Engines |
| engine | Pratt & Whitney Division | JT3D-3 | PRATT & WHITNEY Models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-3, JT3D-3B and JT3D-7 Engines |
| engine | Pratt & Whitney Division | JT3D-3B | PRATT & WHITNEY Models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-3, JT3D-3B and JT3D-7 Engines |
| engine | Pratt & Whitney Division | JT3D-7 | PRATT & WHITNEY Models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-3, JT3D-3B and JT3D-7 Engines |
Unsafe Condition
Cracked No. 6 bearing oil tube assemblies (P/N 415907, 415908, 432000, or 432004) could result in oil leakage and potential engine failure.
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Required Actions
Daily visual inspection of the No. 6 bearing area, 4th stage turbine rotor disc, and turbine exhaust strut assembly bottom strut for oil wetness. Immediate inspection of the No. 6 bearing oil tube assemblies if oil wetness is found. Replace cracked tubes before further flight. Replace all affected tubes within 8000 hours' time in service with increased durability assemblies per SB 2081.
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Compliance Time
Within 8000 hours' time in service after the effective date of this airworthiness directive
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Affected Aircraft
Pratt & Whitney JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-3, JT3D-3B, and JT3D-7 engines installed in Boeing Type 707 and 720 aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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