Standby Electric Pumps - BOMBARDIER Challenger 601-3A CL-600-2B16 Pilot Training Manual

A one-way check valve in each transfer ejec-
tor prevents fuel migration from the main
tanks to the auxiliary tank.

STANDBY ELECTRIC PUMPS

Electric standby pumps are provided for en-
gine starting and as a backup in the event that
a main ejector becomes inoperative (see Fig-
ure 5-2). The two DC-powered pumps will
then operate simultaneously to draw fuel
from their respective collector tanks and feed
a common line capable of providing fuel to
either engine.
POWERED CROSSFEED
SHUTOFF VALVE
COLLECTOR
GRAVITY FLOW LINES
FLAPPER
VALVES
SCAVENGE
EJECTOR
TO ENGINE
LEGEND
SCAVENGE EJECTOR/OVERFLOW PRESSURE
MOTIVE FLOW PRESSURE
MAIN EJECTOR PRESSURE
STANDBY PUMP PRESSURE
Figure 5-4. Fuel Distribution—Abnormal Operation, Main Ejector Fail
OVERFLOW LINE
MAIN
EJECTOR
TANK
FLOAT
VALVE
ENGINE
DRIVEN
PUMP
LOW
PRESSURE
SWITCH
FOR TRAINING PURPOSES ONLY
FlightSafety Canada
CL-600-2B16 PILOT TRAINING MANUAL
Once armed by cockpit switches, the standby
pumps operate automatically when the output
pressure of either main ejector falls below 10
psi. During the engine start sequence, both
pumps operate until the engine-driven pumps
generate enough motive flow to operate the
main ejectors.
The left electric pump is powered by the bat-
tery bus, while the right pump receives power
from DC bus No. 2.
MAIN
CROSSFLOW
VALVE EJECTOR
OVERFLOW LINE
FLAPPER
VALVE
STANDBY
PUMPS
FIREWALL SOV
TRANSFER
EJECTOR
APU SOV
TO APU
LOW
PRESSURE
SWITCH
POWERED CROSSFEED
SHUTOFF VALVE
COLLECTOR
TANK
GRAVITY FLOW LINES
FLAPPER
VALVES
FLOAT
VALVE
FIREWALL
TO ENGINE
ENGINE
DRIVEN
PUMP
CL 601-3R 5-5
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