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A 737-300/400/500MAINTENANCE MANUAL
STANDBY SYSTEM
RESERVOIR
(REF)

STANDBY
EMDP
(REF)

STANDBY SYSTEM
PRESSURE MODULE
SEE A
FWD

WHEEL WELL
STANDBY SYSTEMLOW PRESSUREELECTRICAL PRESSURE MODULE
CONNECTOR SWITCH
CONNECTOR

ELECTRICAL
LOW PRESSURE
SWITCH
SEE B
BACKUP BACKUP
STANDBY SYSTEM  RING O-RING RING
PRESSURE MODULE
LOW PRESSURE SWITCH B
FWD
STANDBY SYSTEM PRESSURE MODULE
A

Standby System EMDP Low Pressure Switch Installation
Figure 401

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A
737-300/400/500MAINTENANCE MANUAL
 B. Access
 (1)  Location Zone
 101 Control Cabin, LH
 102 Control Cabin, RH
 215 Keel Beam

 C. Procedure
 S 644-008
 (1)  
Apply assembly lube or hydraulic fluid to the O-ring and backup rings.

 S 034-007

 (2)  
Install the O-ring and the backup rings in the low pressure switch.

 S 644-006

 (3)  
Apply assembly lube or hydraulic fluid to the threads of the low pressure switch.

 S 034-005

 (4)  
Remove the plug from the standby pressure module.

 S 024-004

 (5)  
Install the low pressure switch.

 (a)  
Tighten the low pressure switch to 50-200 pound-inches.

 (b)  
Install a lockwire.

 S 434-012
 (6)  Install the electrical connector on the low pressure switch.
 D. Do a Check on the Low Pressure Switch
 S 864-009
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-013

 (2)  
Remove the DO-NOT-CLOSE tag and close this circuit breaker:

 (a)  P6-3 Circuit Breaker Panel
 1) INDICATOR MASTER DIM BUS SECT 4

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737-300/400/500MAINTENANCE MANUAL
 S 864-014
 (3)  
Put the FLT CONTROL A or B switch, on the P5 panel, to the STDBY RUD position.

 S 214-015

 (4)  
Make sure the STANDBY HYD LOW PRESSURE light, on the P5 panel, comes on.

 S 864-016

 (5)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P6-11 Circuit Breaker Panel
 1) STBY HYD PUMP NORMAL

 (b)  
P6-12 Circuit Breaker Panel
 1) STBY HYD PUMP (ALT)

 S 214-017
 (6)  
Make sure the STANDBY HYD LOW PRESSURE light goes off.

 S 864-018

 (7)  
Put the FLT CONTROL A or B switch to the ON position.

 (8)  
Make sure the STANDBY HYD LOW PRESSURE light stays off.

 (9)  
Remove electrical power (AMM 24-22-00/201).

 S 214-019
 S 864-020
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