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part of the main tank system.
Auxiliary Tank System
The auxiliary tank system consists of three interconnected tanks: the forward, center and aft
auxiliary tanks. They are located in the fuselage, below the cabin floor. The auxiliary tanks are
filled and drained simultaneously, and may be refueled by pressure or gravity. The auxiliary
tanks feed fuel to the main wing tanks by means of transfer ejector pumps.
Tail Tank System
The tail tank system consists of three separate tanks (the tail cone tank and two saddle tanks),
which share a common sump/manifold. The tail cone tank is a component of the fuselage tail
cone structure. The saddle tanks are located in the aft equipment bay. All three tanks are
pressure-fueled simultaneously by the refueling system, through the common sump/manifold.
The tail tanks may not be gravity refueled.
During normal operations, tail tank fuel is transferred to the auxiliary tank system by electrically
operated tail transfer pumps. This transfer is scheduled and monitored by the FSCU, which
ensures the aircraft is maintained within center-of-gravity limits.
During non-normal operations, the flight crew may control tail transfer pump operation manually.
All the tail tank fuel may be dumped through a dump mast, located at the sump/manifold of the
tail tank system.
Fuel Management
Fuel is burned from the main tanks until they reach 93% of their capacity, then fuel transfer
commences from the auxiliary tanks to the main tanks. Float valves in the main tanks regulate
this fuel transfer, and maintain the main tanks at 93% capacity until the auxiliary tank system
and tail tank system are depleted.
When airborne, tail tank fuel is transferred forward to the auxiliary tank system at a constant
rate. Tail tank fuel transfer is controlled and monitored by the FSCU.
Fuel Quantity Measurement
The FSCU measures fuel quantity through a network of 17 DC-type capacitance probes, located
throughout the main, auxiliary, and tail tank systems. The FSCU receives attitude information
from IRS 1 and IRS 2, and corrects fuel quantity measurements for aircraft attitude. Fuel tank
quantity information is processed by the data concentrator units (DCUs), and is displayed (in
pounds or kilograms) on the EICAS page and SUMMARY page.
Water Drains
In order to check fuel tanks for contamination, water drains are provided for every tank. A drain
valve is located at the bottom of the tail cone tank and the tail tank sump, to enable fuel
sampling and complete drainage when necessary.
FUEL SYSTEM
Description
Vol. 2 12−10−2
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
FUEL TANK SYSTEM (CONT'D)
Water Drains Arrangement
Figure 12−10−2
Vent System
Two wing mid-span NACA scoops vent all wing and auxiliary tanks, to ensure they feed freely.
The tail tanks are vented through their own dedicated system. All three (3) tail tanks are vented
through a common vent line, running down the vertical fin and out the bottom of the fuselage.
Ram air is used to provide a slight positive pressure during flight.
Manual Vent Relief Valves
Two manual vent relief are located underneath the wings near the tips, and a third relief valve is
located beneath the center of the auxiliary tank, to prevent overpressurizing the tanks during
refueling. A fourth vent relief valve, for the tail tank system, is located on the left side of the
vertical fin, but cannot be tested manually.
FUEL SYSTEM
Description
Vol. 2 12−10−3
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
FUEL TANK SYSTEM (CONT'D)
Fuel Vent System (Manual Vent Relief Valves)
Figure 12−10−3
Tail Tank Relief Valve
Figure 12−10−4
CAUTION
If the tail tank relief valve has opened (popped), it indicates an
overpressure condition in the tail tank system, which must be
corrected before flight.
FUEL SYSTEM
Description
Vol. 2 12−10−4
Oct 05/06
CL−605 Flight Crew Operating Manual
PSP 605−6
FUEL DISTRIBUTION
Description
There are two separate fuel distribution systems; the engine fuel feed system, and the APU fuel
feed system.
The engine fuel feed system controls the flow of fuel from the main fuel tanks to the engines.
The APU fuel feed system supplies fuel to the APU. For additional information on the APU fuel
feed system, see Chapter 5, Auxiliary Power Unit.
Components and Operation
The components of the engine fuel feed system are as follows:
Collector Tanks
Two collector tanks, located at the lowest point of the center auxiliary tank, are considered part
　
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