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Figure 12.10.20 Interior Optional Fuel/Defuel Panel 12.10.27
Figure 12.10.21 Exterior FUEL/DEFUEL Panel 12.10.28
Figure 12.10.22 EICAS Page . Fuel Readout 12.10.29
FUEL SYSTEM Description Vol. 2 12.10.1
Oct 05/06
The Challenger 605’s fuel system consists of a fuel tank system, a fuel distribution system, a fuel transfer system, and a refuelling/defueling system. A fuel system computer unit (FSCU) monitors fuel quantity, and controls fuel transfer and refueling/defueling. During normal flight operations fuel management is automatic, requiring no input from the flight crew.
FUEL TANK SYSTEM Description
The fuel storage system consists of three tank systems:
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The main tanks (left and right wing);
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The auxiliary tanks (forward, center and aft tanks); and
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The tail tanks (tail cone tank, left and right saddle tanks).
Fuel Tank System
Figure 12.10.1
The total fuel capacity is 20,000 lb/9,098 kg (pressure refueling) and 15,722 lb/7,130 kg (gravity refueling).
Components and Operation
Main Tank System
The left and right main tanks are integral-type fuel tanks (wet wings), that supply fuel to their respective engines via two collector tanks. Flapper valves in the wing ribs prevent fuel from surging toward the wing tips. The main tanks may be refueled by pressure or gravity. The APU’s normal fuel supply is from the right main tank.
FUEL SYSTEM Description Vol. 2 12.10.2
Oct 05/06
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.
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