AD 62-16-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT3D-1-MC7 | PRATT & WHITNEY Model JT3D-1-MC7 Engines |
Unsafe Condition
Failure of the fourth stage compressor rotor disc, part number 426504, due to cracking between the disc bore and the spacer shoulder.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the fourth stage compressor rotor disc visually using a strong light after removing the front accessory drive support assembly and main spur gear. If cracking is found, replace the disc before further flight. Engines with disc P/N 471904 installed do not require repetitive inspections.
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Compliance Time
Compliance required as indicated in the AD: for engines not previously inspected, inspect within the next 365 hours' time in service if they have 300+ hours since overhaul, or before reaching 675 hours' time in service if under 300 hours. Reinspections must occur every 365 hours' time in service after the last inspection.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney Division JT3D-1-MC7 engines, all serial numbers, requiring inspection of the fourth stage compressor rotor disc (P/N 426504).
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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