AD 77-16-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | JT8D-1 | PRATT & WHITNEY AIRCRAFT Models JT8D-1, -1A, -1B, -7, -7A, -7B, -9, -9A, -11, -15, and -17 Engines |
| engine | Pratt & Whitney Division | JT8D-11 | PRATT & WHITNEY AIRCRAFT Models JT8D-1, -1A, -1B, -7, -7A, -7B, -9, -9A, -11, -15, and -17 Engines |
| engine | Pratt & Whitney Division | JT8D-15 | PRATT & WHITNEY AIRCRAFT Models JT8D-1, -1A, -1B, -7, -7A, -7B, -9, -9A, -11, -15, and -17 Engines |
| engine | Pratt & Whitney Division | JT8D-17 | PRATT & WHITNEY AIRCRAFT Models JT8D-1, -1A, -1B, -7, -7A, -7B, -9, -9A, -11, -15, and -17 Engines |
| engine | Pratt & Whitney Division | JT8D-1A | PRATT & WHITNEY AIRCRAFT Models JT8D-1, -1A, -1B, -7, -7A, -7B, -9, -9A, -11, -15, and -17 Engines |
| engine | Pratt & Whitney Division | JT8D-1B | PRATT & WHITNEY AIRCRAFT Models JT8D-1, -1A, -1B, -7, -7A, -7B, -9, -9A, -11, -15, and -17 Engines |
| engine | Pratt & Whitney Division | JT8D-7 | PRATT & WHITNEY AIRCRAFT Models JT8D-1, -1A, -1B, -7, -7A, -7B, -9, -9A, -11, -15, and -17 Engines |
| engine | Pratt & Whitney Division | JT8D-7A | PRATT & WHITNEY AIRCRAFT Models JT8D-1, -1A, -1B, -7, -7A, -7B, -9, -9A, -11, -15, and -17 Engines |
| engine | Pratt & Whitney Division | JT8D-7B | PRATT & WHITNEY AIRCRAFT Models JT8D-1, -1A, -1B, -7, -7A, -7B, -9, -9A, -11, -15, and -17 Engines |
| engine | Pratt & Whitney Division | JT8D-9 | PRATT & WHITNEY AIRCRAFT Models JT8D-1, -1A, -1B, -7, -7A, -7B, -9, -9A, -11, -15, and -17 Engines |
Unsafe Condition
Failure of the Number 4-1/2 bearing, P/N 707007, Serial Numbers 800 through 999 and 100A through 214A, which could result in low turbine shaft failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove from service Number 4-1/2 bearings, P/N 707007, Serial Numbers 800 through 999 and 100A through 214A prior to March 31, 1978. Replace with an FAA approved, serviceable 4-1/2 bearing.
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Compliance Time
prior to March 31, 1978
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Affected Aircraft
Pratt & Whitney Aircraft JT8D-1, -1A, -1B, -7, -7A, -7B, -9, -9A, -11, -15, and -17 engines with Number 4-1/2 bearing, P/N 707007, Serial Numbers 800 through 999 and 100A through 214A.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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