29-15-00
ALL ú ú 01 Page 22 ú Jul 12/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
AIR CONDITIONING BAY (TYPICAL)
SEE A
AFT BULKHEAD,
AIR CONDITIONING BAY
PRESSURE TO
AIRPLANE SYSTEMS
GROUND SERVICE DISCONNECT MODULE
PRESSURE CONNECTION
RETURN CONNECTION
RETURN FLUID
FROM SYSTEMS FILTER BOWL FWD
A
Ground Service Disconnect Figure 15
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
FLT CONTROL STANDBY A B HYD
SYSTEMS A AND B
PUMP CONTROLS & FAULT INDICATION
Hydraulic Control Panels
Figure 16
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ú 01 Page 24
ú Oct 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
B. A reset switch is provided on the face of the ground fault detector. Actuating the switch, after the ground fault condition has been corrected, energizies the reset coil and positions the internal contacts back to normal.
14. Operation_________
A. Functional Description - Systems A and B (Fig. 17 and 18)
(1)
The pressure sources for systems A and B are one engine driven pump (EDP) and one electric motor-driven pump (EMDP) installed in parallel. The EDP runs all the time that the engine is running. When the ELEC pump switch is ON, the EMDP runs all the time.
(2)
Systems A and B operate the same. The system reservoir supplies fluid under pneumatic pressure to the pumps. Fluid flows directly to the EMDP, and through the shutoff valve to the EDP. The output of the pumps flows through filters in the system pressure modules before going to the operating systems. Return fluid from the operating systems flows through a filter in the return module before entering the reservoir.
(3)
If system pressure becomes too high, a pressure relief valve in the system A and B filter modules opens to route fluid to the system return line.
(4)
Fluid flows through the EMDP and EDP cases for cooling and lubrication. This case drain fluid is filtered by the EMDP or EDP case drain filters and is cooled by the system heat exchanger before its return to the system reservoir.
(5)
The ENG 1 and ENG 2 pump select switch on the hydraulic control panel (P5) controls the on/off condition of the respective system A or B EDP. With the switch in the ON position, the depressurization valve is de-energized and the pump outlet port is open. The pump supplies fluid flow as demanded by the operating systems. Placing the switch in the OFF position energizes the valve to block fluid flow from the pump. The only output is the case drain flow for pump cooling and lubrication. Pulling the engine fire switch on the aft electronic control panel P8 to the FIRE position closes the EDP supply shutoff valve to block fluid flow to the pump.
(6)
The ELEC 1 and 2 pump select switches on the hydraulic control panel (P5) control their respective EMDP's. ELEC 2 switch controls the EMDP for system A and ELEC 1 controls the EMDP for system B. In the ON position the switches provide 28-volt dc thru a pump ground fault detector to energize the EMDP relay. The relay closes to supply 115/200 volt, 400 Hz, 3-phase power to the pump motor. The pump then supplies fluid flow as demanded by the operating systems. Moving the pump select switch to the OFF position removes power and stops the pump.
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