46-40-01: Fuel Tank Selector Valve Placard
FAA order 46-40-01 is an airworthiness directive in force since December 31, 1946. The FAA's subject line: Fuel Tank Selector Valve Placard. It names Fairchild 24: about 242 aircraft on the U.S. register today, though an order usually covers particular versions or serial numbers rather than every one. System: engine.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- Fairchild Industries, Inc.
- Models
- 24 C8, 24 C8A, 24 C8B, 24 C8D, 24 C8DS, 24 C8E, 24 C8ES, 24 C8F (Army UC-61J), 24 C8FS, 24G (Army UC-61H), 24GS, 24H, 24HS, 24J (Army UC-61B), 24JS, 24K (Army UC-61E), 24KS, 24 C8C, 24R9 (Army UC-61C), 24W-9 (Army UC-61F), 24R40 (Army UC-86), 24W-40 (Army UC-61G), 24W-41 (Army UC-61), 24R46A (Army UC-61K), 24W-41A (Army UC-61A), 24R46, 24 C8CS, 24W-40S, 24W-9S, 24R46S, 24R40S, 24R9S
- On this site
- Fairchild 24 242 registered
Dates and paperwork
- In force since
- December 31, 1946
- Published
- June 17, 1950 (signed December 31, 1946)
- 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 (550 characters)
46-40-01 FAIRCHILD: (Was Mandatory Note 4 of AD-707-2: 3 of AD-706-1: 3 of AD- 667-2; 4 of AD-600-2; 4 of AD-633-2; 4 of AD-535-2.) Applies to All Model 24 Series Aircraft.
To eliminate the possibility of engine failure due to air-lock in the fuel system, the fuel tank selector valve should be placarded immediately to specify that fuel be fed from only one tank at a time. This placard should read: "CAUTION. Operate on One Tank at a Time Only."
(Fairchild Service Bulletin No. 44-7-C dated February 10, 1944, covers this same subject.)
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 October 7, 2026. Connections as data: /graph/directive/46-40-01.json · aircraft systems.