-
a strainer 220QM(221QM)

 -
a control valve 153QM(154QM)

 -
a control valve actuator 11QL(12QL).

 The FLSCU (Ref. 28-46-00) has automatic control of the transfer system
 through the control valve 153QM(154QM). When the control valve is open, fuel
 from the main pumps (Ref. 28-21-00) flows through the control valve and a
 nozzle in the jet pump 157QM(158QM). The flow of fuel through the nozzle
 causes a suction in the jet pump. This suction removes the fuel from the
 center (transfer) tank, through the strainer 220QM(221QM), and moves it
 (together with the fuel from the main pumps) to the related wing tank.

 (Ref. Fig. 002)
 The crew can control the transfer system from the cockpit through the CTR TK
 XFR and the MODE SEL P/BSWs on the control panel 40VU. When the MODE SEL
 P/BSW (4QL) is released out (MAN), the automatic control of the transfer
 system stops. In this configuration, when the CTR TK XFR P/BSWs (5QL, 6QL)
 are pushed in (ON), the related control valve is opened and transfer starts.
 When the CTR TK XFR P/BSWs are released out (OFF), the related control valve
 is closed and transfer stops.

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 Main Transfer System - Component Location (Center (Transfer) Tank)
 Figure 001

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 Main Transfer System - Component Location (Cockpit)
 Figure 002

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 (Ref. Fig. 003)
 The control valve 153QM(154QM) is attached to the bottom skin of the center
 (transfer) tank as follows:

 -
the LH control valve between FR36 and FR42 (LH side)

 -
the RH control valve between FR36 and FR42 (RH side). The valve has a spindle that goes through the tank skin to engage with the related control valve actuator 11QL(12QL). The actuator is attached to the outer bottom face of the center (transfer) tank. When energized, the actuator moves the related control valve to the open or closed position. The V-band clamp 155QM(156QM) attaches the control valve to the control valve actuator.

 (Ref. Fig. 004)
 The jet pump 157QM(158QM) and its related strainer 220QM(221QM) is attached
 to the bottom skin of the center (transfer) tank as follows:

 -
the LH jet pump and strainer between FR36 and FR42 (LH side)

 -
the RH jet pump and strainer between FR36 and FR42 (RH side). The strainers remove contamination from the fuel before it goes through the jet pumps.

 A check valve is installed in the end of the transfer pipe. The check valve stops the movement of fuel from the wing tank collector-cell to the center (transfer) tank.
 4. Power Supplies______________ (Ref. Fig. 005, 006)
 5. Interface_________ (Ref. Fig. 007)
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 Control Valve and Control Valve Actuator - Location
 Figure 003

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 Jet Pump and Strainer - Location
 Figure 004
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 Main Transfer System Manual Control System 1 (LH) - Electrical Schematic

 Figure 005
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 Main Transfer System Automatic Control - Electrical Schematic
 Figure 006

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 Main Transfer System - Interfaces
 Figure 007
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 6. Component Description_____________________
 A. Jet Pump 157QM(158QM)
 (Ref. Fig. 008)

 The jet pump has:
 -an inlet body
 -
a jet pump body

 -
a jet nozzle

 -
a non-return valve

 -an outlet body.
 The jet pump body is connected to the inlet body and the outlet body. The jet pump body fully contains the jet nozzle. The jet pump has two fuel inlets, the pressure inlet and the suction inlet. The jet pump body has a flange at the suction inlet. The flange attaches the strainer 220QM(221QM) to the jet pump and attaches the jet pump to the bottom skin of the tank. When fuel from the pressure inlet goes through the jet nozzle, it causes a suction at the suction inlet. The flow of fuel goes through and out of the jet pump outlet body. The non-return valve prevents an opposite flow through the jet pump.
　
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