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.)