Maintenance Manual FK 9
B&F Technik Vertriebs GmbH
Revision 2
Section 5 Fuel System
page 3
document code: des.003
5.1.6. Additional
flexible
Wing tanks
(with fuselage tanks installed, optional)
Additional flexible fuel tanks (capacity 20l each) can be installed in the wings of the FK 9.
They are connected to the main tank and are filled and emptied by using an additional
electrical pump. The overflow/vent (23) is connected to the vent system (8) of the main
tank. Each tank has a fuel valve (19).
Handling of the wing tank:
To fill or empty the tank, the respective fuel valve (19) must be open and the pump must be
switched to the UP or DOWN position.
Filling of the wing tank has to be done on ground with at least 20l of fuel in the main tank.
The wing tank is full as soon as fuel is flowing via the overflow/vent (23) into the vent
system (8) of the main tank. Now the pump has to be switched off and the valve must be
closed.
During flight, the fuel can be pumped out of the wing tank as soon there is space for at
least 20l in the main tank.