AD 70-10-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | Military R-985 Series | PRATT & WHITNEY R-985 and Wasp Jr. Type Engines |
| engine | Pratt & Whitney Division | Wasp Jr. A | PRATT & WHITNEY R-985 and Wasp Jr. Type Engines |
| engine | Pratt & Whitney Division | Wasp Jr. B-4 | PRATT & WHITNEY R-985 and Wasp Jr. Type Engines |
| engine | Pratt & Whitney Division | Wasp Jr. B-5 | PRATT & WHITNEY R-985 and Wasp Jr. Type Engines |
| engine | Pratt & Whitney Division | Wasp Jr. SB | PRATT & WHITNEY R-985 and Wasp Jr. Type Engines |
| engine | Pratt & Whitney Division | Wasp Jr. SB-2 | PRATT & WHITNEY R-985 and Wasp Jr. Type Engines |
| engine | Pratt & Whitney Division | Wasp Jr. SB-3 | PRATT & WHITNEY R-985 and Wasp Jr. Type Engines |
| engine | Pratt & Whitney Division | Wasp Jr. T1B | PRATT & WHITNEY R-985 and Wasp Jr. Type Engines |
| engine | Pratt & Whitney Division | Wasp Jr. T1B2 | PRATT & WHITNEY R-985 and Wasp Jr. Type Engines |
| engine | Pratt & Whitney Division | Wasp Jr. T1B3 | PRATT & WHITNEY R-985 and Wasp Jr. Type Engines |
Unsafe Condition
Failure of the gerotor pump drive pin or plugging of the fuel injector filter P/N 580436 could cause engine power loss.
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Required Actions
Inspect and clean the fuel injector filter P/N 580436 within 100 hours time in service after the effective date and every 100 hours thereafter. Overhaul fuel injector P/N 580047 before accumulating 600 hours time in service; injectors with over 550 hours as of the effective date must be overhauled within 50 hours. Submit substantiating data through an FAA Maintenance Inspector to adjust inspection intervals.
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Compliance Time
Within the next 100 hours time in service after the effective date and thereafter at intervals of 100 hours time in service for inspections. Overhaul prior to 600 hours time in service or within 50 hours if over 550 hours on effective date.
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Affected Aircraft
Pratt & Whitney R-985 and Wasp Jr. type engines altered with Supplemental Type Certificate No. SE1-391 incorporating Simmonds Precision Part No. 580047.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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