AD 57-06-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | Wasp Major B13 | PRATT & WHITNEY Model Wasp Major Engines |
| engine | Pratt & Whitney Division | Wasp Major B14 | PRATT & WHITNEY Model Wasp Major Engines |
| engine | Pratt & Whitney Division | Wasp Major B5 | PRATT & WHITNEY Model Wasp Major Engines |
| engine | Pratt & Whitney Division | Wasp Major B6 | PRATT & WHITNEY Model Wasp Major Engines |
| engine | Pratt & Whitney Division | Wasp Major B7 | PRATT & WHITNEY Model Wasp Major Engines |
| engine | Pratt & Whitney Division | Wasp Major CB2 | PRATT & WHITNEY Model Wasp Major Engines |
| engine | Pratt & Whitney Division | Wasp Major TSB3-G | PRATT & WHITNEY Model Wasp Major Engines |
Unsafe Condition
Propeller shaft oil transfer bearing failures due to inadequate brazing of the propeller shaft oil transfer tube adapter to the bearing, leading to loss of propeller control and inability to feather affected propellers.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
X-ray the brazed joints to determine brazing adequacy, subject the bearing to 1,500 p.s.i. hydraulic pressure test, and conduct a dye penetrant inspection. If the bearing fails inspections, repair or replace it. Alternatively, install new bearing P/N 341627 which eliminates brazed joints.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
As soon as possible but not later than May 31, 1957.
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Affected Aircraft
Pratt & Whitney Model Wasp Major engines, including models B13, B14, B5, B6, B7, CB2, and others as listed in the source.
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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