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The desired position is reached by pulling the lever back. To reach the OFF position a safety guard must be twisted. This is to ensure that this selection is not made unintentionally.
NOTE
If one engine is inoperative the fuel selector valve for this engine must be in the OFF position.
CAUTION
Do not operate with both fuel selector valves in Crossfeed Position. Do not take-off with a fuel selector valve in Crossfeed Position.
CAUTION
Do not shut down an engine with the fuel selector valve. The high pressure fuel pump can otherwise be damaged.
Scheme of the fuel selector valve positions:
Possible operating modes of the three fuel selector valve positions are outlined systematically in the following scheme. The figures below show fuel flows for the RH engine (fuel flows LH are alike):
figure 1: normal operation
figure 2: crossfeed operation
figure 3: shut-off position With the LH fuel selector valve in Crossfeed position, the fuel from the RH tank is transferred to the LH engine. Depending on the position of the RH fuel selector valve, the RH tank then feeds both engines (as shown in figure 4 below) or only the LH engine, when the fuel selector valve of the RH engine is in shut-off position (as shown in figure 5 below).
figure 4: fuel selector valve RH normal operation position, fuel selector valve LH Crossfeed position
figure 5: fuel selector RH valve shut-off position, fuel selector valve LH Crossfeed position
Main fuel tanks
Each tank consists of three aluminum chambers which are connected by a flexible hose. The tank is filled through a filler in the outboard fuel chamber. Only four liters (1 US gal) of fuel in each wing are unusable, so that a total quantity of 96 liters (25.4 US gal) in each wing is usable.
There are two tank vents. One includes a check valve with a capillary and one includes a relief pressure valve, which operates at 150 mbar (2 psi) and allows fuel and air to flow to the outside with higher internal pressure. The relief pressure valve protects the tank against high pressure, if the tank was overfilled in case of an auxiliary fuel transfer failure. The check valve with capillary allows air to enter the tank but prevents flow of fuel to the outside. The capillary equalizes the air pressure during climb. The hose terminals are located on the underside of the wing, approximately 2 meters (7 ft) from the wing tip.
In each tank a coarse filter (finger filter) is fitted before the outlet. To allow draining of the tank, there is an outlet valve at its lowest point.
At the lowest point in each side of the fuel system a fuel filter with a drain valve is installed. This drain valve can be used to remove water and sediment which has collected in the fuel system. The drain valves are fitted in each nacelle behind the firewall, approximately 15 cm (0.56 ft) backward of the wing leading edge.
Fuel quantity indication
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