AD 76-20-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT8D-1 | PRATT & WHITNEY AIRCRAFT Model JT8D-1, -1A, -1B, -7, -7A, and -7B Engines |
| engine | Pratt & Whitney Division | JT8D-1A | PRATT & WHITNEY AIRCRAFT Model JT8D-1, -1A, -1B, -7, -7A, and -7B Engines |
| engine | Pratt & Whitney Division | JT8D-1B | PRATT & WHITNEY AIRCRAFT Model JT8D-1, -1A, -1B, -7, -7A, and -7B Engines |
| engine | Pratt & Whitney Division | JT8D-7 | PRATT & WHITNEY AIRCRAFT Model JT8D-1, -1A, -1B, -7, -7A, and -7B Engines |
| engine | Pratt & Whitney Division | JT8D-7A | PRATT & WHITNEY AIRCRAFT Model JT8D-1, -1A, -1B, -7, -7A, and -7B Engines |
| engine | Pratt & Whitney Division | JT8D-7B | PRATT & WHITNEY AIRCRAFT Model JT8D-1, -1A, -1B, -7, -7A, and -7B Engines |
Unsafe Condition
Liberation of second stage fan blades due to taper wear in excess of .0025 inch on the blade retaining strap.
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Required Actions
Inspect the blade retaining strap for taper wear in accordance with Section 72-33-1 of Pratt & Whitney Aircraft JT8D Series Engine Manual P/N 481672, Revision 78 or later FAA approved revision. Remove second stage fan blades with taper wear exceeding .0025 inch before further flight. Install second stage fan blade bumper P/N 642409 per Service Bulletin 2406 or equivalent method approved by the FAA.
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Compliance Time
prior to June 30, 1978, unless already accomplished
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Affected Aircraft
Pratt & Whitney Aircraft JT8D-1, -1A, -1B, -7, -7A, and -7B engines
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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