- Models
- Double Wasp CA15, Double Wasp CA18, Double Wasp CA3, Double Wasp CA5, Military R-2800 Series
- Data sheets
- TCDSE-231TCDSTC 5E-8
- Product
- Engine
Unofficial copy of the text in the FAA’s Dynamic Regulatory System. The FAA’s own copy is the authoritative one. DRS record last changed May 30, 2024.
Copies of the files this page was built from, with their SHA-256. Retrieved October 18, 2026.
| File | Size | SHA-256 | Original |
|---|---|---|---|
| FAA DRS HTML | 20 KB | 6df58069…ecdb540 | FAA DRS (API key needed) |
On this page
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 TCDS · 2
The type certificate data sheets for the models this AD names, matched by model and maker.