Airplane Description DA 42 AFM
Page 7 - 44 Rev. 8 15-Dec-2017 Doc. No. 7.01.05-E
Auxiliary Fuel Tanks (if installed)
The auxiliary fuel tanks are optional equipment (OÄM 42-056).
Description
The auxiliary fuel tanks are installed in the rear section of the engine nacelles, above the
wing main spars. Each auxiliary fuel tank has a filler cap located on the top surface of
the nacelle. The additional fuel capacity is 52 liter (13.7 US gal) per side. The total fuel
capacity (main fuel tanks and auxiliary fuel tanks) is 150.4 liter (39.7 US gal) per side.
The fuel supply connection attaches to a finger filter mounted at the rear of the auxiliary
fuel tank. Each auxiliary fuel tank has a fuel transfer pump which pumps fuel into the
related main fuel tank. Upstream of the fuel transfer pump an inline filter, a solenoid valve
and a check valve are installed. The valves prevent fuel from flowing back out of the main
tank into the auxiliary tank.
The vent line for the auxiliary fuel tank has a check valve with capillary. It allows air to
enter the tank but prevents flow of fuel to the outside. The capillary equalizes the air
pressure during climb. A fuel drain valve is located at the rear of each auxiliary tank.
Operation
Two FUEL TRANSFER switches in the cockpit are used to activate the fuel transfer pumps
and to open the solenoid valves. The switches are located behind the elevator trim wheel
on the center console. Both switches are intended to be used simultaneously to prevent
the airplane from additional lateral imbalance. The fuel transfer pump pumps the fuel from
the auxiliary fuel tank into the related main fuel tank. Fuel level switches shut this pump
and the related solenoid valves off automatically, if the auxiliary fuel tank is empty or if
the main fuel tank is full. During operation of the pumps an advisory alert on the Garmin
G1000 indicates that the fuel transfer is in progress.
If the auxiliary fuel tank is empty, a caution alert appears on the Garmin G1000. In this
case the fuel pumps must be switched OFF.
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