Section 7 Pilot’s Operating Handbook
Description of Airplane and Systems EXTRA 500
7.16.b Fuel Transfer System
The wing tanks are equipped with a fuel transfer system each.
This system continuously pumps fuel from the auxiliary
compartment to the main compartment and from there to the
collector compartment. This ensures that the collector
compartments (fuel supply to the engine) are permanently filled
with fuel as long as fuel is available in the respective wing tank.
Each fuel transfer system runs by means of an “motive flow”
electric fuel pump feeding three jet pumps, two of them located
inboard and outboard in the main compartment, and one in the
auxiliary compartment of the respective wing side. The motive
flow pump takes fuel from the collector compartment to
generate a high pressure/low mass flow to the jet pumps, which
suck fuel from their compartment and discharge a low
pressure/high mass flow into the main respective collector
compartment.
Motive pressure being below the minimum operation pressure is
detected by pressure switches (one for each transfer system) and
indicated by illumination of a yellow FUEL TRANS LEFT or
FUEL TRANS RIGHT caution light on the annunciator panel.
This indicates the system is inoperative or operating below its
design performance.
The following may cause this:
• System has not been activated.
• Fuel supply to the motive flow pump failed or interrupted (fuel
level in collector compartment below approx. ¼).
• System failure (clogged filter or line, component or line failure,
electrical failure)
The
FUEL TRANSFER switches activate the fuel transfer
system. After activation the corresponding caution lights have
to be monitored. The lights have to extinguish within 10 sec. In
case the caution light does not extinguish or the FUEL TRANS
light comes on during operation of the system the system has to
be switched off. It may be attempted to reactivate the system
after checking fuel quantity in the corresponding collector
compartment and the corresponding
FUEL-TR circuit breaker.
In case reactivation fails the system has to be switched off.
Continuous dry run of the motive flow pump has to be avoided
7-42 26. January 2011
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