AD 68-12-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT4A-10 | PRATT & WHITNEY Model JT4A Series Engines |
| engine | Pratt & Whitney Division | JT4A-11 | PRATT & WHITNEY Model JT4A Series Engines |
| engine | Pratt & Whitney Division | JT4A-12 | PRATT & WHITNEY Model JT4A Series Engines |
| engine | Pratt & Whitney Division | JT4A-3 | PRATT & WHITNEY Model JT4A Series Engines |
| engine | Pratt & Whitney Division | JT4A-5 | PRATT & WHITNEY Model JT4A Series Engines |
| engine | Pratt & Whitney Division | JT4A-9 | PRATT & WHITNEY Model JT4A Series Engines |
Unsafe Condition
High Compressor Rotor Blade Failure
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Required Actions
Rework all diffuser case assemblies with part numbers 361176, 397231, 419006, 406242, 429614, 447328, and 450862 in accordance with Pratt & Whitney Service Bulletin No. 1033 or FAA-approved revisions. Compliance must be completed within 11,000 hours' time in service after the effective date of this AD.
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Compliance Time
within the next 11,000 hours' time in service after the effective date of this AD
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Affected Aircraft
Pratt & Whitney Model JT4A Series Engines including JT4A-10, JT4A-11, JT4A-12, JT4A-3, JT4A-5, and JT4A-9 models
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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