AD 67-28-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT3D-1 | PRATT & WHITNEY Models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-3, and JT3D-3B Engines |
| engine | Pratt & Whitney Division | JT3D-1-MC6 | PRATT & WHITNEY Models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-3, and JT3D-3B Engines |
| engine | Pratt & Whitney Division | JT3D-1-MC7 | PRATT & WHITNEY Models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-3, and JT3D-3B Engines |
| engine | Pratt & Whitney Division | JT3D-3 | PRATT & WHITNEY Models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-3, and JT3D-3B Engines |
| engine | Pratt & Whitney Division | JT3D-3B | PRATT & WHITNEY Models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-3, and JT3D-3B Engines |
Unsafe Condition
Cracks emanating from the root of fan blade slots in the first stage fan hub, P/N 431001, due to cyclic stress from engine operation at specified power ratings.
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Required Actions
Visually inspect the front of the first stage fan hub with at least 3-power magnification for cracks. Remove the hub from service if cracks are found, except for flights under FAR 21-197 to a maintenance base. Adjust inspection intervals via FAA approval with substantiating data.
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Compliance Time
Before further flight, and thereafter at intervals not to exceed four cycles from the last inspection.
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Affected Aircraft
Pratt & Whitney Models JT3D-1, JT3D-1-MC6, JT3D-1-MC7, JT3D-3, and JT3D-3B engines with first stage fan hubs, P/N 431001, not previously inspected per SB 1219 or reworked per SB 1066/1219.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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