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 NOTE: If you stop an engine driven pump (EDP) when the electric motor
____ driven pump (EMDP) is on, it is possible the LOW PRESSURE light for the EDP will not come on for two minutes or more. This is because pressure is caught in the line between the EDP and the pressure module. With the EMDP in operation, this pressure can only bleed back through the blocking valve in the EDP.
 C.  System A and B low pressure lights are on the P5 panel above the respective control switches. The standby low pressure light is located on the P5 panel, near the flight control switches.
 D.  Each low pressure warning circuit is powered by 28 volt dc power through circuit breakers on the P6 panel. Circuits from EDP low pressure switches are routed through respective engine fire circuits to deactivate the circuit with the engine fire switch on FIRE. The standby hydraulic low pressure circuit is not connected until the standby pump is commanded on.
 E.  Activation of a low hydraulic pressure warning circuit will cause the Master Caution and hydraulic annunciator lights to illuminate on the pilot's lightshield.
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 29-34-01
 ALL  ú ú 01 Page 1 ú Jul 15/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C316
28/16V DC
MD & T

C317 C318 P6-3 LOAD CONTR CTR
P
STANDBY HYD
LOW PRESSURE

AA
SYS A ENG 1 LOW PRESSURE
AA
SYS B ENG 2 LOW PRESSURE
AA
SYS B ELEC 1 LOW PRESSURE
AA
SYS A ELEC 2 LOW PRESSURE P5 PANEL
A
737-300/400/500MAINTENANCE MANUAL
STANDBY
RUDDER

OFF SYSTEM A ON
CONTROL SW
STANDBY
RUDDER

OFF SYSTEM B ON
CONTROL SW
AUTO STANDBY SYSTEM RELAY
OFF
ALT FLAP MASTER ARMING SW
ARM
P5 PANEL
NORM
FIRE ENG FIRE SW 1
NORM
FIRE ENG FIRE SW 2
P8 AFT ELECTRONIC CONTROL PANEL
GRD SEEKING
MASTER TEST

Low Pressure Warning Hydraulic Systems
Figure 1

A 
A 
MASTER TEST  STANDBY HYDRAULIC LOW PRESSURE LIGHT 

SEE MASTER CAUTION CIRCUITRY
P
SYS A EDP LOW PRESS SW
P
SYS B EDP LOW PRESS SW
P
SYS B EMDP LOW PRESS SW
P
SYS A EMDP LOW PRESS SW
T81077
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 29-34-01
 ALL  ú ú 01 Page 2 ú Oct 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 PUMP LOW PRESSURE WARNING SYSTEM - ADJUSTMENT/TEST
__________________________________________________
 1.  General_______
 A.  The test of the pump low pressure warning system is a check for electrical continuity between the low pressure lights and the pressure switches. It is also a check for correct operation and pressure settings of the pressure switches. The pressure settings of the switches are not adjustable.
 B.  Do a check of the pumps, one at a time, to get an accurate check of the pressures and light operations.
 NOTE: If you stop an engine driven pump (EDP) when the electric motor
____ driven pump (EMDP) is on, it is possible the LOW PRESSURE light for the EDP will not come on for two minutes or more. This is because pressure is caught in the line between the EDP and the pressure module. With the EMDP in operation, this pressure can only bleed back through the blocking valve in the EDP. If this is your problem, ignore it, the system is O.K.
 TASK 29-34-01-705-016
 2.  Pump Low Pressure Warning System Test_____________________________________
 A.  Standard Tools and Equipment
 (1)  Hydraulic test bench - 0 to 3000 psi
 B.  References
 (1)  24-22-00/201, Manual Control
 C.  Access
 (1)  Location Zone
 101 Control Cabin, LH
 102 Control Cabin, RH

 D.  Prepare for the Test
 S 865-001
 (1)  
Supply electrical power (Ref 24-22-00/201).

 S 865-002

 (2)  
Make sure that these circuit breakers are closed:

 (a)  P6-3 Circuit Breaker Panel 1) MASTER CAUTION ANNUNCIATOR NO. 1 2) MASTER CAUTION ANNUNCIATOR BAT 3) PANEL AND INSTR 28V PRIMARY F/O 4) PANEL AND INSTR 28V PRIMARY CAPT AND CTR 5) INDICATOR MASTER DIM BUS BAT
　
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