56-18-02: Crankcase
FAA order 56-18-02 is an airworthiness directive. The FAA's subject line: Crankcase. System: other and general.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- Kelowna Flightcraft R & D Ltd.
- Models
- 340
Dates and paperwork
- Docket
- Unknown
- Status
- Current
- The FAA's document
- Read the order on the FAA's site
The order itself the regulatory text, as published
Show the full text (959 characters)
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.
Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of November 6, 2026. Connections as data: /graph/directive/56-18-02.json · aircraft systems.