Page 42 - Aeronca 7A Interactive Service Manual

SERVICE HELPS AND HINTS NO. 33 September 10, 1948

TO: ALL AERONCA DISTRIBUTORS AND DEALERS

SUBJECT: Installation of Auxiliary Fuel Valve Warning Placard

MODELS AND SERIAL NUMBERS EFFECTED:
Model 11AC - all
Model 11BC - all
Model 11CC - 11CC-1 to 11CC-223 inclusive
Model 11AC-S - only if 7-530 rear fuselage auxiliary fuel system is installed therein.
Model 7AC - only if 7-565 rear fuselage auxiliary fuel system is installed therein.
Model 7BCM - only if 7-565 rear fuselage auxiliary fuel system is installed therein.
Model 7CCM - only if 7-565 rear fuselage auxiliary fuel system is installed therein.
Model 7DC - only if 7-565 rear fuselage auxiliary fuel system is installed therein.

PURPOSE: To promote proper use of auxiliary fuel system in interest of additional safety, particularly to
student pilots.

DATE TO BE ACCOMPLISHED: No deadline, but prompt compliance recommended. CAA has
announced their intention to issue an Airworthiness Directive Note on this subject.

MATERIAL REQUIRED: One 1-3416 Auxiliary Fuel Valve Warning Placard.

REFERENCE: Champion and Chief Service Manuals, page 22.

GENERAL:
A. What It Is:

The 1-3416 placard reads as follows: “VALVE MUST BE CLOSED EXCEPT IN LEVEL FLIGHT.
ENGINE WILL NOT OPERATE FROM AUX. TANK, THEREFORE IF AUX. FUEL IS TO BE
USED, MAIN TANK MUST BE AT LEAST ½ FULL WHEN DRAINING IS STARTED TO INSURE
CONTINUOUS ENGINE OPERATION.”

B. Why Necessary:
CAA has stated that it is considered advisable to install this placard in the interests of safety. If the
placard instructions are not followed the following may happen:

a. If the valve is left on when airplane is in climbing or 3-point attitude, fuel can flow from main tank
and overflow the auxiliary tank.

b. If valve is turned on before main tank is ½ emptied, the main tank can be overflowed.

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