AD 71-07-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT8D-1 | PRATT & WHITNEY Model JT8D-1, -1A, -7, and -7A Engines |
| engine | Pratt & Whitney Division | JT8D-1A | PRATT & WHITNEY Model JT8D-1, -1A, -7, and -7A Engines |
| engine | Pratt & Whitney Division | JT8D-7 | PRATT & WHITNEY Model JT8D-1, -1A, -7, and -7A Engines |
| engine | Pratt & Whitney Division | JT8D-7A | PRATT & WHITNEY Model JT8D-1, -1A, -7, and -7A Engines |
Unsafe Condition
Failure of the front compressor front hub due to possible surface defects in the blade slots or loss of effectiveness of shotpeening in the blade slots, which could cause cracks emanating from the base of the acute corner of the dovetail slots.
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Required Actions
Inspect the rear face and overhung shelf of the hub rim for cracks visually every 150 cycles or with an eddy current probe every 400 cycles. Alternatively, remove blades and inspect slots with eddy current probe every 1500 cycles. Replace hub before further flight if cracks are found. For hubs not shotpeened, follow inspection procedures in paragraphs 1(a)-(e).
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Compliance Time
Compliance required as indicated on all front compressor front hubs that have accumulated 6000 cycles or more in service.
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Affected Aircraft
Pratt & Whitney JT8D-1, -1A, -7, and -7A engines using Front Compressor Front Hub Part Nos. 504101 and 515201, with specific engine and hub serial numbers listed in Pratt & Whitney Alert Service Bulletin 2944, Revision 5.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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