6.

A
737-300/400/500MAINTENANCE MANUAL
 B.  When not in use, the fueling receptacle is covered and sealed by a cap. The cap connects to the lugs on the fueling hose adapter like the fueling hose; when the cap is in the position, the seal in the cap is forced against the fueling hose adapter to seal the inlet to the fueling hose adapter. To prevent loss, the cap is attached to the fueling hose adapter with a piece of chain.
Refuel Panel (Fig. 1)
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 A.  The refuel panel (P15) is found in the fueling bay and has all the controls necessary for operation of the pressure fueling system. Components installed on the refuel panel are refuel quantity indicators, fueling shutoff valve switches, fueling shutoff valve OPEN indicator lights, and a fueling indicator and fueling shutoff test switch.
 B.  The refuel quantity indicators show the fuel quantity in each tank. The refuel quantity indicators are connected to their corresponding fuel quantity indicators in the flight compartment. The indicators test switch supplies a check to find if the refuel quantity indicators operate. If you put the switch to TEST GAGES position it will cause the refuel quantity indicator to move toward zero (analog indicators) or count down to zero and show an error code (digital indicators). The test switch can be put to AUX FUELING POWER CONTROL to bypass the fueling power control switch should it not operate.
 C.  The fueling shutoff valve switches control the operation of the fueling shutoff valves. Valve open lights installed adjacent to the shutoff valve switches come on when the applicable fueling shutoff valve is open.
Fueling Power Control Switch (Fig. 1)
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 A.  The fueling power control switch automatically supplies 28v dc electric power to the fueling shutoff valve switches when the access door for the refuel station is opened. When you close the access door it removes electric power from the valve switches which lets the fueling shutoff valves close in case the switches were accidentally left in the valve open position after fueling. The fueling power control switch is found at the forward, outboard corner of the refuel station and has a fixed sensor and a magnetic actuator which moves with the hinged access door for the refuel station.
Fueling Receptacle Manifold (Fig. 1)
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 A.  The fueling receptacle manifold is installed on the forward surface of the wing front spar and is the collection and distribution center for the pressure fueling system. The fueling receptacle manifold has a cast aluminum unit with one inlet and four outlet ports. The inlet port is connected to the fueling receptacle. The inboard outlet port is connected to the crossfeed line and the three outboard outlet ports are conneted to the fueling lines.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 7.  Fueling Float Switch (Fig. 1)
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 A.  Fueling float switches, one for each fuel tank, prevent the fuel tanks from being overfilled. During pressure fueling, with a fueling shutoff valve switch in the OPEN position and the fuel tank less than full, the fueling float switch closes the fueling circuit to open the fueling shutoff valve and cause the light to come on. When the fueling float switch senses a full fuel tank, power is removed from the fueling shutoff valve. The fueling shutoff valve closes and the valve OPEN light goes off.
 8.  Operation (Fig. 2 and 3)
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 A.  The pressure fueling system operates on 28v dc power. 115v ac power is used for the fuel quantity indicating system. The dc power is supplied to the fueling shutoff valves through relays and the fueling float switches. When a full fuel load is necessary, the fueling float switches close the fueling shutoff valves automatically when the fuel tanks are full. When a partial fuel load is necessary, the refuel quantity indicators are monitored, and the fueling shutoff valves are closed when you manually put the fueling shutoff valve switches to OFF when the selected fuel quantity is reached.
 B.  Before the start of the refuel operation, push each light cover to test the fueling valve open lights. If the refuel quantity indicators are used, they are tested for operation by actuating the fueling indicator test switch. Operation of the switch will cause the refuel quantity indicator to move towards zero. After completing the check of the instruments, the cap is removed from the fueling receptacle and the fueling hose connected. When you open the applicable fueling shutoff valve it makes the airplane ready to receive fuel. The start of the pumping operation pressurizes the fueling lines, and lets fuel flow into the fuel tanks.
　
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