AD 62-10-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT4A-10 | PRATT & WHITNEY AIRCRAFT DIVISION Model JT4A Series Engines |
| engine | Pratt & Whitney Division | JT4A-11 | PRATT & WHITNEY AIRCRAFT DIVISION Model JT4A Series Engines |
| engine | Pratt & Whitney Division | JT4A-12 | PRATT & WHITNEY AIRCRAFT DIVISION Model JT4A Series Engines |
| engine | Pratt & Whitney Division | JT4A-3 | PRATT & WHITNEY AIRCRAFT DIVISION Model JT4A Series Engines |
| engine | Pratt & Whitney Division | JT4A-5 | PRATT & WHITNEY AIRCRAFT DIVISION Model JT4A Series Engines |
| engine | Pratt & Whitney Division | JT4A-9 | PRATT & WHITNEY AIRCRAFT DIVISION Model JT4A Series Engines |
Unsafe Condition
Looseness or rattling of third stage turbine rotor blades, P/N 405903, 411803, or 411903, which could lead to blade failure.
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Required Actions
Inspect third stage turbine rotor blades for looseness or rattling in accordance with Pratt & Whitney Aircraft telegraphic message of November 15, 1961. Remove engine for blade replacement if looseness or rattling is found before further flight. Operators with more frequent inspections may delay replacement for one additional 15-hour period if time since last inspection does not exceed 85 hours.
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Compliance Time
Within the next 85 hours' time in service after April 26, 1962, and thereafter at intervals not exceeding 85 hours' time in service from the last inspection.
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Affected Aircraft
Pratt & Whitney Aircraft Division Model JT4A Series engines (all serial numbers) with third stage turbine rotor blades P/N 405903, 411803, or 411903.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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