AD 71-17-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | J60-P-5B | PRATT & WHITNEY AIRCRAFT Model JT12A-6, JT12A-6A, JT12A-8, and J60P-5B Engines |
| engine | Pratt & Whitney Division | JT12A-6 | PRATT & WHITNEY AIRCRAFT Model JT12A-6, JT12A-6A, JT12A-8, and J60P-5B Engines |
| engine | Pratt & Whitney Division | JT12A-6A | PRATT & WHITNEY AIRCRAFT Model JT12A-6, JT12A-6A, JT12A-8, and J60P-5B Engines |
| engine | Pratt & Whitney Division | JT12A-8 | PRATT & WHITNEY AIRCRAFT Model JT12A-6, JT12A-6A, JT12A-8, and J60P-5B Engines |
Unsafe Condition
Cracking and possible failure of stage 2, 3, 7, and 8 compressor rotor discs due to life limits exceeding revised lower thresholds.
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Required Actions
Remove from service stage 2, 3, 7, and 8 compressor rotor discs prior to reaching the revised life limits (specifically reduced from previous limits for part numbers 406302, 541902, 406203, 541903, 426107, 541907, 406208, 541908). Compliance must occur within 30 cycles in service after the effective date or before reaching the new life limits, whichever is later.
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Compliance Time
within 30 cycles in service after the effective date of this airworthiness directive, whichever comes later
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Affected Aircraft
Pratt & Whitney Aircraft JT12A-6, JT12A-6A, JT12A-8, and J60P-5B Turbojet engines
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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