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曝光台 注意防骗 网曝天猫店富美金盛家居专营店坑蒙拐骗欺诈消费者
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During takeoff and landing with at least one of the following:
Flaps > 0°, landing gear down and in flight, or low wing fuel condition (600 pounds each wing)
Each AUX pump may be inhibited by selecting off a switch on the fuel control panel. The pumps are automatically controlled by the Secondary Power Distribution Assembly (SPDA).
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
FUEL SYSTEM SYNOPTIC PAGE (CONT'D)
Center Transfer Pumps
Two center transfer pumps (controlled by the FMQGC) are used to transfer fuel from the center tank to the main wing tank. There is no manual selection available to transfer fuel from the center tank to the wings.
FUEL CONTROL PANEL
The fuel control panel is located on the overhead panel in the flight compartment. The fuel control panel defines the operational modes, component controls and component inhibits.
The fuel control panel has switches, which when selected, override the automatic control of certain components within the fuel system. Switch selections from this panel are sent to the ACPC. The ACPC will then control the system from the inputs received from the panel. The switch lamps come on in combination with certain EICAS messages, which represent the panel configuration or failure
within a given system.
WING XFEED switch
AUTO selection . Provides a means of transferring fuel from one wing to the other. Controlled by the FMQGC.
<. or .> selection . A left to right or a right to left selection, provides a means of transferring fuel (in the direction of the arrow) from one wing tank to the other.
OFF selection . Provides a method of inhibiting wing to wing transfer.
XFEED SOV switch FAIL light . Will come on when the valve does not go to the commanded position.
OPEN light . When the switch is selected, the crossfeed valve opens and interconnects the engine feed lines.
PRI PUMPS Switch
OFF light . Indicates that both left wing primary pumps have been disarmed. The right PRI PUMPS switch has similar logic.
AUX PUMP switch
OFF light . Indicates that the right auxiliary pump has been disarmed. The left AUX PUMP has similar
logic.
RECIRC INHIBIT switch
OFF light . Indicates that the FRTT valve is closed when commanded by the flight crew.
FGF1210_003
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
FUEL TANKS
All fuel is carried in three integral tanks (left wing, right wing and center wing).
The inboard section of each wing is designated as a feed tank, from which each engine draws its fuel. Fuel flows from the outboard sections of each wing tank, into the feed tank (by gravity), through swing check valves in the baffles of each main tank. The check valves allow fuel flow in the inboard direction only. This will restrict large fuel movements and limit center of gravity shifts in airplane changes of attitude. Fuel is also transferred into the feed tanks from the center wing tank by the transfer system.
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