(2)
Only on-ground tank-to-tank fuel transfer is possible. Fueling station controls and the crossfeed valve switchlight on the pilot's overhead panel P5 control tank-to-tank fuel transfer.
2. Component Details_________________
A. Defuel Valve (Fig. 2)
(1)
Description
(a)
The defueling valve is a motor actuated butterfly valve. The defueling valve mounts to the rear spar of the center wing fuel tank. The valve body (within the fuel tank) connects to the actuator (outside the fuel tank) by an adapter/shaft. Access to the valve body requires defueling.
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FUELING MANIFOLD
MAIN TANK BOOST
PUMP BYPASS VALVE
DEFUELING VALVE DEFUELINGVALVEMAIN TANK BOOSTPUMP BYPASS VALVE
Defueling System
Figure 1
A
757
MAINTENANCE MANUAL
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757
MAINTENANCE MANUAL
ADAPTER PLATE
ASEE VALVE DEFUELING ADAPTER SHAFT ACTUATOR
HANDLE MANUAL OVERRIDE
VALVE BODY
DEFUELING VALVE A 2 REAR SPARUNIVERSAL JOINT
ADAPTER VALVE
UNIVERSAL JOINT ACTUATOR
MANUAL OVERRIDE HANDLE
ADAPTER SHAFT
1 2 PREFERRED ALTERNATE DEFUELING VALVE A 1 BODY VALVE REAR SPAR
Defueling Valve
Figure 2
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757 MAINTENANCE MANUAL
(b)
The defueling valve square (preferred) actuator has a 28v dc permanent magnet motor, an electrical connector, OPEN - CLOSED limit switches, and a manual override handle. The manual override handle also shows the position of the defueling valve.
(c)
The defueling valve round (alternate) actuator has a 28v dc drive motor, an electrical connector, OPEN - CLOSED limit switches, and a manual override handle. The manual override handle also shows the position of the defueling valve.
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本文链接地址：757 AMM 飞机维护手册 燃油 CHAPTER 28 - FUEL 4(60)
