S 864-002
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A

747-400
MAINTENANCE MANUAL

SEE  A 
2. HIGH PRESSURE TUBE 
1. ELECTRICAL 
CONNECTOR 
3. BONDING JUMBER 
4. HIGH PRESSURE 
CONTROLLER 
SEE  B 
5. SIGNAL 
PRESSURE 
TUBE 

FWD
A
High Pressure Controller Installation
Figure 401 (Sheet 1)

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747-400
MAINTENANCE MANUAL

HIGH PRESSURE PORT 
3. BONDING JUMPER  A 
SIGNAL PRESSURE PORT  A  A 
MOUNTING BRACKET  A 

6.
 BOLT

7.
 WASHER (3 PLACES)

4. HIGH PRESSURE CONTROLLER
8. BOLT SEE C
PRESSURE CONTROLLER (REF)
VIEW LOOKING AFT 
B  11. NUT 
(2 PLACES) 9. UNION  JUMPER 3. BONDING 12. WASHER 
(2 PLACES) 10. O-RING  GROUND STRAP  8. BOLT 
A-A  C 
High Pressure Controller Installation Figure 401 (Sheet 2) 

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747-400 MAINTENANCE MANUAL
 4) 6H35 AIR SUPPLY CONT 4 PWR
 S 044-030
 WARNING: DO THE DEACTIVATION PROCEDURE FOR THE THRUST REVERSER TO
_______ PREVENT THE OPERATION OF THE THRUST REVERSER. ACCIDENTAL OPERATION OF THE THRUST REVERSER CAN CAUSE INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT.
 (3)  
Do the deactivation procedure for the thrust reverser for ground maintenance (Ref 78-31-00/201).

 S 014-037

 (4)  
Open the left fan cowl panel (Ref 71-11-04/201).

 S 014-038

 (5)  
Open the left core cowl panel (Ref 71-11-06/201).

 S 014-039
 WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO OPEN THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS WHEN YOU OPEN THE THRUST REVERSERS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (6) Open the left half of the thrust reverser (Ref 78-31-00/201).
 D. Remove the High Pressure Controller
 S 034-005
 (1)  
Disconnect the electrical connector DM7191 (1) from the high pressure controller (4).

 S 034-006

 (2)  
Disconnect the high pressure tube (2) from the high pressure controller (4).

 S 034-032

 (3)  
Disconnect the signal pressure tube (5) from the high pressure controller (4).

 S 034-007

 (4)  
Put the caps on the open tubes and the ports to keep out unwanted objects.

 S 034-008

 (5)  
Remove the nut (11), washer (12) and bolt (8) to disconnect the bonding jumper (3).

 S 034-033

 (6)  
Remove the three mounting bolts (6) and washers (7) which hold the high pressure controller to the engine.

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747-400 MAINTENANCE MANUAL
 S 024-034
 (7)  
Remove the high pressure controller (4) from the engine.

 S 034-010