(a)  
Make sure the PRV is fully closed by visually checking the position switch.

 (b)  
If the PRV is open then replace the PRV (AMM 36-11-19/401).

 (c)  
Make sure the PRV shows CLOSED on the ECS maintenance page.

 (d)  
If the PRV is closed but does not indicate CLOSED on the ECS maintenance page, troubleshoot the position switch and/or wiring.

 S 715-042
 (3)  
Test the PRV and the PRV controller operation.

 (a)  
Disconnect the PRV supply pressure tube and install the male fitting to the PRV controller supply pressure tubing.

 (b)  
Disconnect the PRV controller downstream (braided flex) line and install the 45 degree fitting to the PRV controller regulated pressure tubing.

 (c)  
Remove the PRV locking pin from the PRV actuator and install the actuator fitting. As an alternative, remove the signal pressure sense line at the actuator and install a tee fitting between the actuator and sense line.

 (d)  
Connect one end of the supply pressure (red) hose to the supply port on the test box and the other end to the male fitting in the PRV controller supply pressure tubing.

 (e)  
Connect one end of the regulated pressure (yellow) hose to the regulated pressure port on the test box and the other end to the 45 degree fitting in the PRV controller regulated pressure tubing.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400
MAINTENANCE MANUAL

PRESSURE REGULATING VALVE (PRV)
SEE B
PRV CONTROLLER 
PRESSURE  REGULATED 
VALVE (PRV) REGULATING  PRESSURE TUBE  PRV CONTROLLER 
SEE  B  DOWNSTREAM 
REGULATING VALVE DOWNSTREAM PRESSURE  45` FITTING  BRAIDED  SENSE LINE 
SENSE LINE  FLEX LINE 
SEE  A 

PW ENGINE PNEUMATICS TEST BOX REGULATED SUPPLY REFERENCE
PRESSURE PRESSURE PRESSURE PRV CONTROLLER SUPPLY PRESSURE TUBE
MALE FITTING
PRV SUPPLY PRESSURE TUBE
PRESSURE REGULATING VALVE FWD DOWNSTREAM SENSE LINE
A
LOCKING PIN
ACTUATOR PRESSURE ACTUATOR TUBE
TEE
FITTING SIGNAL PRESSURE TUBE
FWD REFERENCE
PRESSURE REGULATING VALVE (PRV)
PRESSURE
B
OPTIONAL INSTALLATION
Pressure Regulating Valve and Controller Figure 503 (Sheet 1)
H89053
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

PRESSURE REGULATING
PRESSURE
VALVE DOWNSTREAM
REGULATING
SENSE LINE
VALVE 
SEE  C  DOWNSTREAM 
PRESSURE  45`  SENSE LINE 
REGULATING  FITTING 
VALVE CONTROLLER 
BRAIDED 
SEE  D  FLEX LINE 
PW ENGINE 

PNEUMATICS
REGULATED SUPPLY REFERENCE TEST BOX PRESSURE PRESSURE PRESSURE
PRV CONTROLLER LINE
MALE
FITTING
FWD
PRESSURE REGULATING VALVE DOWNSTREAM SENSE LINE
STRAIGHT FITTING C
ACTUATOR PRESSURE PORT
FWD
OUTBD
PRESSURE REGULATING VALVE CONTROLLER
D

Pressure Regulating Valve and Controller Figure 503 (Sheet 2)
L05439
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (f)  
Connect one end of the reference pressure (blue) hose to the reference pressure port on the test box and the other end to the actuator fitting or tee fitting.

 (g)  
　
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