AD 78-12-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Canada Corp. | PT6A-38 | PRATT & WHITNEY AIRCRAFT (Canada) Model PT6A-38, PT6A-41, PT6A-45A Engines |
| engine | Pratt & Whitney Canada Corp. | PT6A-41 | PRATT & WHITNEY AIRCRAFT (Canada) Model PT6A-38, PT6A-41, PT6A-45A Engines |
| engine | Pratt & Whitney Canada Corp. | PT6A-45A | PRATT & WHITNEY AIRCRAFT (Canada) Model PT6A-38, PT6A-41, PT6A-45A Engines |
Unsafe Condition
Oil leakage from the No. 2 bearing pressure oil transfer tube assembly due to the use of Part Number 3019268 or 3027054 tube assemblies.
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Required Actions
Replace Part Number 3019268 and 3027054 No. 2 bearing pressure oil transfer tube assemblies with Part Number 3030150 tube assembly following Pratt & Whitney Service Bulletin No. 3099 or approved equivalent parts.
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Compliance Time
within the next 50 hours in service after the effective date of this AD
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Affected Aircraft
Pratt & Whitney Aircraft of Canada, Limited PT6A-38 engines prior to Serial Number PCE-79179, PT6A-41 engines prior to Serial Number PCE-80718, PT6A-45A engines prior to Serial Number PCE-84108, and PT6A-38 engines prior to Serial Number P-79179 with Part Number 3019268 or 3027054 No. 2 bearing pressure oil transfer tube assemblies.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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