Engine-Driven Pumps; Crossflow Valve; Powered Crossfeed Valve - BOMBARDIER Challenger 601-3A CL-600-2B16 Pilot Training Manual

ENGINE-DRIVEN PUMPS

Each two-stage engine-driven fuel pump is a
single unit containing two pumps mounted in
piggyback fashion. The first stage is a cen-
trifugal, low-pressure pump which receives
fuel from the main ejector and supplies it to
the engine and the second stage, or high-
pressure side, of the pump. This second stage
uses a positive-displacement pump to supply
high-pressure motive flow fuel to the main
a n d s c av e n g e e j e c t o r s . ( s e e F i g u r e 5 - 2
or 5-3.)
Operation of the engine fuel system is dis-
cussed in Chapter 7, "Powerplant."

CROSSFLOW VALVE

Should a main tank fuel imbalance occur in
flight for any reason, it can be corrected by
opening the crossflow valve (see Figure 5-2
or 5-3) which connects both main tanks and
both collector tanks. Balance is achieved
through gravity flow only. To avoid a serious
imbalance which might occur if the wings are
not level, the crossflow should not be left open
when the airplane is on the ground.
5-4 CL 601-3A
CL-600-2B16 PILOT TRAINING MANUAL

POWERED CROSSFEED VALVE

When depressing the LEFT TO RIGHT or
RIGHT TO LEFT switchlight , the associated
powered crossfeed shutoff valve (Figure 5-4
or 5-5) opens to allow fuel flow, by gravity, into
the auxiliary fuel tank. Fuel is then transferred
to the opposite tank while a quantity is re-
turned to its original tank by the transfer
ejectors when in flight or the fuel boost pumps
via the transfer ejectors when on the ground.
FOR TRAINING PURPOSES ONLY
FlightSafety Canada
NOTE
Maximum imbalance is 800 pounds.
L té e
L td .