AD 70-25-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT8D-1 | PRATT & WHITNEY Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-11 | PRATT & WHITNEY Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-15 | PRATT & WHITNEY Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-15A | PRATT & WHITNEY Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-17 | PRATT & WHITNEY Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-17A | PRATT & WHITNEY Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-17AR | PRATT & WHITNEY Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-17R | PRATT & WHITNEY Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-1A | PRATT & WHITNEY Model JT8D Series Engines |
| engine | Pratt & Whitney Division | JT8D-1B | PRATT & WHITNEY Model JT8D Series Engines |
Unsafe Condition
Seventh stage compressor rotor disc failures as a result of suspected material deficiency.
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Required Actions
Replace discs with specific cycle thresholds: within 30 cycles for 2700+ cycles in service, within 100 cycles but before 2730 for 2300-2700 cycles, within 300 cycles but before 2400 for 2000-2300 cycles, and before 2300 cycles for less than 2000 cycles.
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Compliance Time
Within the specified cycle thresholds as outlined in the directive.
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Affected Aircraft
Pratt & Whitney JT8D series engines with Part Number 500507 seventh stage compressor rotor disc serial numbers listed in Service Bulletin No. 2817, Rev. No. 1.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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