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Collector Tanks
Two collector tanks, situated at the lowest point of the center auxiliary tank, are
considered 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 SYSTEM
For Training Purposes Only
Sept 04
12-3
P I LOT T R A I N I N G GU I D E
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.
Water Drains Arrangement
Figure 12-2
WATER DRAIN VALVE
P604_12_011
PICTURE
T.B.D.
Water Drain Valve
FUEL SYSTEM
12-4 For Training Purposes Only
Jan 04
P I LOT T R A I N I N G GU I D E
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 valves 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 Vent System (Manual Vent Relief Valves)
Figure 12-3
Main Tank
Manual Fuel
Vent
Main Tank
Manual Fuel
Vent
P604_12_012
MANUAL VENT RELIEF VALVE
Aux Tank
Manual Vent
FUEL SYSTEM
For Training Purposes Only
Sept 04
12-5
P I LOT T R A I N I N G GU I D E
Tail Tank Relief Valve
Figure 12-4
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 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 primary page.
Fuel Distribution
Description
There are two separate fuel distribution systems, the engine fuel feed system and the
APU fuel feed system.
Engine Fuel Feed System
The engine fuel feed system controls the flow of fuel from the main fuel tanks to the
engines.
CAUTION
P604_12_015
FUEL SYSTEM
12-6 For Training Purposes Only
Sept 04
P I LOT T R A I N I N G GU I D E
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.
　
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