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A

747-400
MAINTENANCE MANUAL

PNEUMATICS 
TEST BOX 
HIGH PRESSURE SHUTOFF 
VALVE (HPSOV) 
SEE  B  REGULATED  SUPPLY  REFERENCE 
PRESSURE  PRESSURE  PRESSURE 
HIGH PRESSURE 
CONTROLLER (HPC) 
SEE  A 
TO HPSOV 
PW ENGINE  HIGH STAGE PORT  ACTUATOR 
90` 
FITTING  HIGH PRESSURE 
CONTROLLER (HPC) 

FWD
OUTBD
HIGH PRESSURE CONTROLLER (HPC) A
High Pressure Shutoff Valve and Controller Figure 502 (Sheet 1)
H87947
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A
747-400
MAINTENANCE MANUAL

HIGH PRESSURE SHUTOFF VALVE (HPSOV) FWD
SEE C TEE
HIGH PRESSURE
SIGNAL
SHUTOFF VALVE (HPSOV)
PRESSURE TUBE
B
HPSOV ACTUATOR
REFERENCE PRESSURE
LOCKING PIN
SIGNAL PRESSURE TUBE PNEUMATICS
TEST BOX
REGULATED SUPPLY REFERENCE
ACTUATOR
PRESSURE PRESSURE PRESSURE
FITTING
FWD  TO HIGH STAGE PORT
HIGH PRESSURE SHUTOFF VALVE (HPSOV) C
1 OPTIONAL INSTALLATION
High Pressure Shutoff Valve and Controller Figure 502 (Sheet 2)
H88648
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747-400 MAINTENANCE MANUAL
 S 215-034
 (2)  
Make sure the HPSOV is closed.

 (a)  
Make sure the HPSOV is closed by visually inspecting the position switch.

 (b)  
If the valve is not closed then replace the HPSOV
 (AMM 36-11-05/401).

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

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

 S 715-035
 (3)  
Test the HPSOV and the HPC operation.

 (a)  
Disconnect the high pressure tube at the HPC and install the 90 degree test fitting to the HPC high stage port.

 NOTE: The high stage port is labeled HP on the HPC.

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

 (c)  
Connect one end of the supply pressure (red) hose to the supply port on the test box and the other end to the 90 degree test fitting on the HPC high stage port.

 (d)  
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.

 (e)  
Make sure the engine bleed switch located on the overhead panel is ON.

 S 715-061
 (4)  
Do these steps to do a test of the HPC PHH pressure switch operation using input monitoring:

 (a)  
Display the input monitoring page on the CMC by selecting the following: 1) MENU 2) OTHER FUNCTIONS (Page 2 of the CMC menu) 3) INPUT MONITORING

 (b)  
Type in the following depending on the engine number being tested 1) For engine 1 type in: E/40/352/10 2) For engine 2 type in: E/40/352/01 3) For engine 3 type in: E/40/352/11 4) For engine 4 type in: E/40/352/00

 (c)  
Make sure bit 16 (PHH switch) is 1, with zero supply pressure.

 (d)  
Use the 'HIGH PRESSURE SUPPLY' gauge on the test box.

 (e)  
Increase the supply pressure to 115 psig. After 115 psig, slowly increase pressure, (1 psi/second) until bit 16 changes to 0.

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