AD 66-14-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | Military R-985 Series | PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines |
| engine | Pratt & Whitney Division | Wasp Jr. A | PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines |
| engine | Pratt & Whitney Division | Wasp Jr. B-4 | PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines |
| engine | Pratt & Whitney Division | Wasp Jr. B-5 | PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines |
| engine | Pratt & Whitney Division | Wasp Jr. SB | PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines |
| engine | Pratt & Whitney Division | Wasp Jr. SB-2 | PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines |
| engine | Pratt & Whitney Division | Wasp Jr. SB-3 | PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines |
| engine | Pratt & Whitney Division | Wasp Jr. T1B | PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines |
| engine | Pratt & Whitney Division | Wasp Jr. T1B2 | PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines |
| engine | Pratt & Whitney Division | Wasp Jr. T1B3 | PRATT & WHITNEY Model Wasp Jr. and R-985 Series Engines |
Unsafe Condition
Failure of the cam reduction drive gear assembly and resultant loss of engine power
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace cam reduction drive gear assembly, P/N 3965, with cam reduction drive gear, P/N 331098.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
at the next engine overhaul after the effective date of this AD unless already accomplished
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Pratt & Whitney Model Wasp Jr. and R-985 Series Engines with cam reduction drive gear assembly, P/N 3965
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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