Section 7 Pilot’s Operating Handbook
Description of Airplane and Systems EXTRA 500
7.16.d Fuel Vent System
The vent system incorporates two float type check valves for
each main and auxiliary compartment, which close the vent line
when the float is pushed upward by the fuel level. A vent line
interconnects the left and right main compartments. To prevent
overpressure due to thermal expansion, pressure relief valves
are installed in the left and right main and auxiliary
compartments.
7.16.e Fuel Drain Valves
The fuel system has in total twelve (12) fuel drains. Five drains
per wing side, one (1) at the selector valve (gascolator position)
and one (1) at the fuel filter just in front of the nose gear bottom
of the aircraft.
The drains provide a device for removing moisture and
sediment from the fuel system.
Important For further drain procedures refer to Section 4 and Section
8 of this POH.
7.16.f Electrical Fuel Pumps
Two electrical fuel boost pumps are present to ensure correct
fuel pressure levels at the engine fuel connection and for vapor
suppression. The pumps are installed in the engine
compartment, between the fuel filter and the engine. They are in
a parallel set up for redundancy reasons. Behind each pump a
check valve assures no fuel will return through an eventual
inoperative pump. The
FUEL PUMP 1 and 2 switches activate
the related fuel pumps.
Normally, one pump is operating to provide sufficient pressure
at the inlet of the engine driven fuel pump. The second
electrical fuel pump is considered as a back up system. It is
advisable to change the mainly active pump from flight to flight
to avoid excessive wear of one fuel pump. During takeoff,
approach and landing, both electrical fuel pumps must be
switched on.
7-46 26. January 2011
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