AD 95-16-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT8D-1 | PRATT & WHITNEY (PW) JT8D-1, -1A, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, and -17AR turbofan engines |
| engine | Pratt & Whitney Division | JT8D-11 | PRATT & WHITNEY (PW) JT8D-1, -1A, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, and -17AR turbofan engines |
| engine | Pratt & Whitney Division | JT8D-15 | PRATT & WHITNEY (PW) JT8D-1, -1A, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, and -17AR turbofan engines |
| engine | Pratt & Whitney Division | JT8D-15A | PRATT & WHITNEY (PW) JT8D-1, -1A, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, and -17AR turbofan engines |
| engine | Pratt & Whitney Division | JT8D-17 | PRATT & WHITNEY (PW) JT8D-1, -1A, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, and -17AR turbofan engines |
| engine | Pratt & Whitney Division | JT8D-17A | PRATT & WHITNEY (PW) JT8D-1, -1A, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, and -17AR turbofan engines |
| engine | Pratt & Whitney Division | JT8D-17AR | PRATT & WHITNEY (PW) JT8D-1, -1A, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, and -17AR turbofan engines |
| engine | Pratt & Whitney Division | JT8D-17R | PRATT & WHITNEY (PW) JT8D-1, -1A, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, and -17AR turbofan engines |
| engine | Pratt & Whitney Division | JT8D-1A | PRATT & WHITNEY (PW) JT8D-1, -1A, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, and -17AR turbofan engines |
| engine | Pratt & Whitney Division | JT8D-7 | PRATT & WHITNEY (PW) JT8D-1, -1A, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, and -17AR turbofan engines |
Unsafe Condition
Cracks in the tierod holes in 9th through 12th stage high pressure compressor (HPC) disks can result in uncontained fractures and engine failure.
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Required Actions
Initially inspect 9th through 12th stage HPC disks at the tierod holes per PW ASB 4723 Rev 12. Thereafter, inspect disks per the same ASB, with reinspection before specified intervals or first inspection limit, whichever is later. Remove cracked disks from service and replace or repair per PW ASB 4723 Rev 12. For 10th stage disks last inspected with on-wing ultrasonic method, perform magnetic particle or eddy current inspection within 750 cycles since last inspection, then follow ASB 4723 Rev 12 for subsequent inspections.
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Compliance Time
Required as indicated, unless accomplished previously in accordance with prior revisions of PW ASB 4723. For 10th stage disks, inspections must be done no later than 750 cycles in service since last on-wing inspection.
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Affected Aircraft
Pratt & Whitney JT8D-1, -1A, -7, -7A, -7B, -9, -9A, -11, -15, -15A, -17, -17A, -17R, and -17AR engines with applicable HPC disks as listed in PW ASB 4723 Rev 12, installed on Boeing 727/737 and McDonnell Douglas DC-9 series aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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