Pilot’s Operating Handbook Section 7
EXTRA 500 Description of Airplane and Systems
as this may cause excessive wear and overheat of the motive
flow pump.
In case the transfer system of one wing is inactive the fuel flow
from the wing tank towards its collector compartment is
maintained by means of gravity (flapper valves), but the fuel
level in the collector compartment will not be higher than in the
wing tank itself. The unusable fuel quantity of the wing tanks
(incl. their collector compartment) will increase from 14 to 32l
with inoperative transfer system. For the fuel in the auxiliary
compartment no gravity feed to the main compartment exits.
Therefore fuel in the auxiliary compartment cannot be used for
engine supply with the corresponding transfer system being
inoperative.
7.16.c Fuel Selector Valve
Fuel runs from the wing tanks through fuel lines passing check
valves and meeting in the fuel selector valve, which is located
under the cockpit floor. It is direct mechanically linked to the
FUEL SELECTOR VALVE handle between the pilot’s and
copilot’s seats. The following handle positions are possible:
LEFT, BOTH, RIGHT and OFF.
During normal cruise flight changes between
LEFT, BOTH and
RIGHT position of selector valve in intervals can be made.
Important A fuel unbalance of more than 106 liters (28 U.S. Gallons)
must be avoided.
The
OFF position is selected, when the aircraft is parked or in
several emergency situations as described in Section 3.
26. January 2011 7-43
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