AD 69-23-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Canada Corp. | PT6A-20 | UNITED AIRCRAFT OF CANADA, LIMITED Model PT6 Series Engines |
| engine | Pratt & Whitney Canada Corp. | PT6A-27 | UNITED AIRCRAFT OF CANADA, LIMITED Model PT6 Series Engines |
| engine | Pratt & Whitney Canada Corp. | PT6A-28 | UNITED AIRCRAFT OF CANADA, LIMITED Model PT6 Series Engines |
| engine | Pratt & Whitney Canada Corp. | PT6A-6 | UNITED AIRCRAFT OF CANADA, LIMITED Model PT6 Series Engines |
| engine | Pratt & Whitney Canada Corp. | PT6A-6A | UNITED AIRCRAFT OF CANADA, LIMITED Model PT6 Series Engines |
| engine | Pratt & Whitney Canada Corp. | PT6A-6B | UNITED AIRCRAFT OF CANADA, LIMITED Model PT6 Series Engines |
| engine | Pratt & Whitney Canada Corp. | PT6B-9 | UNITED AIRCRAFT OF CANADA, LIMITED Model PT6 Series Engines |
Unsafe Condition
Disengagement of the fuel pump input coupling from the engine gearbox
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove retaining ring Pesco P/N 99-4660 and install new snap ring Pesco P/N 99-4906
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Compliance Time
within 50 hours after the effective date of this Airworthiness Directive unless already accomplished
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Affected Aircraft
PT6A-6, -6A, -6B, PT6B-9 all engines; PT6A-20 prior to S/N PC-E22480; PT6A-27 prior to S/N PC-E40311; PT6A-28 prior to S/N PC-E50054 except 50051, 50052
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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