# AD 49-40-02: Thrust Plate

- Type: Airworthiness directive
- Status: Current
- Products: Pratt & Whitney Division Double Wasp CA15, Double Wasp CA18, Double Wasp CA3, Double Wasp CA5 and Military R-2800 Series
- Superseded by: Nothing supersedes this AD
- Product type: Engine
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/389BC114B6D145118625685B005D20EC.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/49-40-02

## The airworthiness directive

49-40-02 PRATT & WHITNEY: Applies to 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.

To be accomplished at next overhaul but in no case later than March 1, 1950.

To preclude the possibility of complete loss of power as a result of failure of the supercharger impeller thrust bearing, the engine must be modified to incorporate a new thrust plate P/N 127770 with larger (No. 51) oil feed holes. Also P/N 84012 thrust spacer must be reworked to incorporate circumferential oil skates. Details off this modification and rework are given in Pratt & Whitney Service Bulletin No. 892, Revision B.

As a precautionary measure, it is recommended that the engine be operated with minimum use of high ratio supercharger and that particular attention be directed toward keeping oil sludge to a minimum until the above modification has been accomplished.

## Affected data sheets (2) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS E-231](https://openairdocs.org/tcds/E-231): Pratt & Whitney Division; names 4 of 7 models: Double Wasp CA5, Double Wasp CA15, Double Wasp CA18, Double Wasp CA3
- [TCDS TC 5E-8](https://openairdocs.org/tcds/TC%205E-8): Pratt & Whitney Division; names 1 of 1 models: Military R-2800 Series

## Registered aircraft it may apply to (OpenAirDocs)

No registered aircraft matched the models it names.

Its text cites no advisory circulars or STCs.

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