AD 62-22-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT3D-1 | PRATT & WHITNEYJT3D-1 Engines |
Unsafe Condition
Failure of the fourth stage compressor rotor disc, part number 393504, due to cracking between the disc bore and the spacer shoulder.
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Required Actions
Inspect the fourth stage compressor rotor disc by removing the front accessory drive support assembly and main spur gear, using a strong light for visual inspection. If cracking is found, remove the engine for disc replacement. Replace disc P/N 393504 with P/N 468304 to eliminate repetitive inspections.
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Compliance Time
Within the specified intervals: for engines with ≥235 hours since last inspection/overhaul, inspect within next 130 hours after effective date and every 365 hours thereafter. For engines with <235 hours, inspect before reaching 365 hours since last inspection/overhaul. For un-inspected/unoverhauled engines with ≥300 hours, inspect within next 65 hours and every 365 hours thereafter. For those with <300 hours, inspect before 365 hours accumulation.
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Affected Aircraft
Pratt & Whitney Division JT3D-1 Turbofan Engines, all serial numbers.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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