AD 77-03-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT8D-1 | PRATT & WHITNEY AIRCRAFT Models JT8D-1, -1A, -1B, -7, -7A, and -7B Engines |
| engine | Pratt & Whitney Division | JT8D-1A | PRATT & WHITNEY AIRCRAFT Models JT8D-1, -1A, -1B, -7, -7A, and -7B Engines |
| engine | Pratt & Whitney Division | JT8D-1B | PRATT & WHITNEY AIRCRAFT Models JT8D-1, -1A, -1B, -7, -7A, and -7B Engines |
| engine | Pratt & Whitney Division | JT8D-7 | PRATT & WHITNEY AIRCRAFT Models JT8D-1, -1A, -1B, -7, -7A, and -7B Engines |
| engine | Pratt & Whitney Division | JT8D-7A | PRATT & WHITNEY AIRCRAFT Models JT8D-1, -1A, -1B, -7, -7A, and -7B Engines |
| engine | Pratt & Whitney Division | JT8D-7B | PRATT & WHITNEY AIRCRAFT Models JT8D-1, -1A, -1B, -7, -7A, and -7B Engines |
Unsafe Condition
Failure of the compressor front hub due to cracks emanating from the base of the blade slot caused by lack of shotpeening.
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Required Actions
Inspect the rear face and overhung shelf of the front compressor front hub for cracks using visual or eddy current method per P&WA ASB 4661. Reinspect at 150 or 400 cycle intervals depending on method. Replace the hub before further flight if a crack is found.
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Compliance Time
within the next 150 cycles in service unless already accomplished
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Affected Aircraft
Pratt & Whitney Aircraft JT8D-1, -1A, -1B, -7, -7A, and -7B engines with front compressor front hub P/N 504101 and serial numbers listed in Pratt & Whitney Aircraft Alert Service Bulletin 4661 (dated October 15, 1976)
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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