AD 71-24-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT9D-3A | PRATT & WHITNEY ENGINES Model JT9D-3A Engines |
Unsafe Condition
Rupture of the part number 669647 diffuser case assembly as a result of borescope boss weld cracks.
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Required Actions
Inspect all borescope positions in accordance with paragraph 4 within specified cycles after the effective date and at recurring intervals. Replace or repair the diffuser case if cracks are found, following Pratt & Whitney Aircraft Alert Service Bulletin No. 2901. Adjust inspection times may be approved by the FAA based on substantiating data.
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Compliance Time
Compliance required as indicated.
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Affected Aircraft
Pratt & Whitney Aircraft JT9D-3A turbofan engines with Part Number 669647 diffuser case assembly.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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