AD 67-01-03
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
Failure of the fuel manifold assembly due to cracks in parts numbers 378155, 378156, 391957, 391959, 447330, and 447339.
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Required Actions
Inspect fuel manifold assemblies using fluorescent penetrant inspection. Replace cracked assemblies with specified parts or P/N 572766/572767. Glass bead peen cluster tee fillets if no cracks found, and at each overhaul.
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Compliance Time
Within the next 3,400 hours' time in service after January 5, 1967
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Affected Aircraft
Pratt & Whitney Division Model JT4A-10, JT4A-11, JT4A-12, JT4A-3, JT4A-5, JT4A-9 engines
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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