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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 12.10.3
Oct 05/06
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 12.10.4
Oct 05/06
Fuel Vent System (Manual Vent Relief Valves)
Figure 12.10.3
Tail Tank Relief Valve
Figure 12.10.4
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 SYSTEM Description Vol. 2 12.10.5
Oct 05/06
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.
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本文链接地址：庞巴迪挑战者605公务机机组操作手册 CL605-燃油系统 FUEL SYSTEM(3)
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