Fuel Distribution; Gravity Flow; Scavenge Ejectors - BOMBARDIER Challenger 601-3A CL-600-2B16 Pilot Training Manual

FUEL DISTRIBUTION

GRAVITY FLOW

Fuel flows by gravity within the main tanks
through lightening holes in the ribs. One inner
rib in each main tank is equipped with flap-
per valves to prevent outward flow of fuel
(Figure 5-2).
Fuel flows from the inboard sections of the
main tanks to the collector tanks (Figure 5-2).
Flapper valves at the collector tank inlets pre-
vent reverse flow of fuel into the main tanks.
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
OVERFLOW LINE
MAIN
EJECTOR
TANK
FLOAT
VALVE
ENGINE
DRIVEN
PUMP
LOW
PRESSURE
SWITCH
Figure 5-2. Fuel Distribution—Normal Operation
FOR TRAINING PURPOSES ONLY
FlightSafety Canada
CL-600-2B16 PILOT TRAINING MANUAL

SCAVENGE EJECTORS

Gravity flow to the collector tanks is sup-
plemented by scavenge ejectors located at
the rear of the inboard section of each main
tank. The scavenge ejectors ensure that the
collector tanks are supplied with fuel re-
gardless of airplane attitude. Failure of a
scavenge ejector will cause illumination of
an amber caution light in the cockpit.
Motive flow for operation of a scavenge ejec-
tor comes from the high-pressure side of the
two-stage engine-driven fuel pump (Figure
5-2). Ejectors have no moving parts. Each op-
erates on the venturi principle to convert
CROSSFLOW MAIN
OVERFLOW LINE
VALVE EJECTOR
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 5-3
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