AD 49-40-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | Double Wasp CA15 | PRATT & WHITNEY Models Double Wasp CA Series (-3, -5, -15, -18) and Military R-2800-C Series (-22, -22W, -34, -34W, -57, -73, -77, -81, -83, -85) Engines |
| engine | Pratt & Whitney Division | Double Wasp CA18 | PRATT & WHITNEY Models Double Wasp CA Series (-3, -5, -15, -18) and Military R-2800-C Series (-22, -22W, -34, -34W, -57, -73, -77, -81, -83, -85) Engines |
| engine | Pratt & Whitney Division | Double Wasp CA3 | PRATT & WHITNEY Models Double Wasp CA Series (-3, -5, -15, -18) and Military R-2800-C Series (-22, -22W, -34, -34W, -57, -73, -77, -81, -83, -85) Engines |
| engine | Pratt & Whitney Division | Double Wasp CA5 | PRATT & WHITNEY Models Double Wasp CA Series (-3, -5, -15, -18) and Military R-2800-C Series (-22, -22W, -34, -34W, -57, -73, -77, -81, -83, -85) Engines |
| engine | Pratt & Whitney Division | Military R-2800 Series | PRATT & WHITNEY Models Double Wasp CA Series (-3, -5, -15, -18) and Military R-2800-C Series (-22, -22W, -34, -34W, -57, -73, -77, -81, -83, -85) Engines |
Unsafe Condition
Failure of the supercharger impeller thrust bearing could result in complete loss of power.
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Required Actions
Install a new thrust plate P/N 127770 with larger (No. 51) oil feed holes and rework the P/N 84012 thrust spacer to incorporate circumferential oil skates. Follow Pratt & Whitney Service Bulletin No. 892, Revision B.
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Compliance Time
at next overhaul but in no case later than March 1, 1950
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Affected Aircraft
Pratt & Whitney Double Wasp CA Series (-3, -5, -15, -18) and Military R-2800-C Series (-22, -22W, -34, -34W, -57, -73, -77, -81, -83, -85) Engines
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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