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庞巴迪挑战者605公务机机组操作手册 CL605-燃油系统 FUEL SYSTEM(4)

时间:2011-10-29 10:55来源:蓝天飞行翻译 作者:公务机
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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 of the main tank system. They receive fuel from their respective main wing tank via gravity or scavenge ejector pump flow. Fuel from the collector tanks is supplied to each engine-driven pump unit by main ejector pumps or electric boost pumps.

Boost Pumps
Two DC electric boost pumps provide the engines with a standby fuel feed system. They are available for engine starting, and as a backup fuel feed source if either main ejector pump output pressure is too low to satisfactorily feed its respective engine. The left boost pump is powered by the DC battery bus, and the right boost pump by DC bus 2. The boost pumps are located downstream of their respective collector tanks, on the fuel feed lines to the engine-driven pumps. During normal operation, the only pilot action required is to arm both BOOST PUMP switches on the FUEL control panel prior to engine start, and disarm them after shutdown.
When both BOOST PUMP switches are armed, the boost pumps are activated if low pressure is sensed at either left or right main ejector pressure switch (this is the case prior to engine start). If a single BOOST PUMP switch is armed, both boost pumps will be activated if low pressure is sensed on the armed side’s main ejector pressure switch. For example, if only the left BOOST PUMP switch is armed (pressed in), then both pumps will activate if low pressure is sensed at the left main ejector output. The boost pumps can provide fuel to both engines fuel feed systems through a crossover feed line.
If a boost pump has been activated, sufficient pump output pressure is indicated by the green ON legend in the switch/light. Insufficient output pressure is indicated by the amber INOP legend, and the L (R) FUEL PUMP caution EICAS message.

BOOST PUMP Switch/Lights
Figure 12.10.5

 

 FUEL SYSTEM Description  Vol. 2  12.10.6 
Oct 05/06 


Engine-Driven Pump
The engine-driven pump supplies high-pressure fuel to the engine fuel control unit (FCU) for combustion, and to the motive flow system to power the ejector pumps. The engine-driven pump is located on the engine accessory gearbox, and operates whenever the engine core (N2) is
turning. For additional information, see Chapter 19, Power Plant.

Motive Flow
Motive flow is the continuous movement of fuel under pressure through the fuel feed lines. Motive flow is generated by the engine-driven pump, and is sufficient to supply the engine with its fuel intake needs through the on-side main ejector pump. If a blockage occurs within the feed system, and motive flow fuel pressure drops (sensed at the main ejector pump pressure switch), the electric boost pumps activate, and supply the engine with sufficient fuel for operation.
 
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