52-28-01 AERONCA: Applies to All Model 11AC and S11AC Aircraft Equipped With the Auxiliary Fuel Tank Installation.
Compliance required not later than January 31, 1953.
Accidents have occurred in the above model aircraft due to misuse of the fuel transfer system. These accidents have been caused by pilots attempting to transfer fuel while taking off or in a climb attitude. To preclude the possibility of pilot error with regard to the foregoing, the following placard, or its equivalent, shall be displayed near the fuel transfer system shutoff valve and in view of the pilot: "Transfer fuel in level flight or glide only and when main tank is half full or less. Valve is to be closed except while transferring fuel."