- Model
- 340
- Data sheet
- TCDS6A6
- Registered aircraft
- 7 matched by model
- Product
- Aircraft · Large airplane
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 | d9f7aa9e…5c77fed | FAA DRS (API key needed) |
On this page
The airworthiness directive
56-18-02 CONVAIR: Applies to All 340 Aircraft.
Compliance required preferably at next engine overhaul but not later than June 1, 1957.
Due to the possibility in hot weather operation that the engines installed in Convair 340 airplanes can experience excessive oil temperatures and inability to scavenge the crankcase, Pratt & Whitney Aircraft Service Bulletins Nos. 1513 and 1524 shall be accomplished as indicated above.
This serious condition, which has been experienced in hot weather on several occasions by two scheduled airline operators, is attributed mainly to high oil flow rates, which will be effectively reduced by compliance with these Pratt & Whitney Service Bulletins.
(Air Carrier Maintenance Alert Bulletin No. 241 also deals with this subject.)
As an alternate to compliance with these bulletins, the adoption of maintenance practices and engine overhaul procedures which effectively reduce oil flow rates will be acceptable.
Affected TCDS · 1
The type certificate data sheets for the models this AD names, matched by model and maker.
Registered aircraft · 7
Registered aircraft whose airframe or engine model this AD names. Matched by model only, so check each against the AD’s applicability.
| 1953 | 3 |
|---|---|
| 1955 | 3 |
| 1956 | 1 |