S 414-055

 (2)  
Close the left core cowl panel (Ref 71-11-06/201).

 (3)  
Close the left fan cowl panel (Ref 71-11-04/201).

 S 444-053

 (4)  
Do the activation procedure for the thrust reverser (Ref
 78-31-00/201).

 S 864-039

 (5)  
Remove the electrical power if it is not necessary. (Ref
 24-22-00/201).

 S 414-054
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 HIGH PRESSURE CONTROLLER - SERVICING
____________________________________
 1.  General_______
 A.  This procedure contains one task. It replaces the air filter for the high pressure controller.
 B.  The high pressure controller is installed on the forward face of the main gearbox. It is necessary to open the left half of the thrust reverser to get access to the high pressure controller.
 TASK 36-11-06-613-001
 2.  Service the High Pressure Controller (Fig. 301)____________________________________
 A.  Consumable Materials
 (1)
D00244 Anti-Seize, Silver Goop

 B.  
References

 (1)
AMM 71-11-04/201, Fan Cowl Panels

 (2)
AMM 71-11-06/201, Core Cowl Panels

 (3)
AMM 78-31-00/201, Thrust Reverser System

 (4)
CMM 36-12-02/401, United Technologies/Hamilton Standard Manual

 C.  
Access

 (1)  
Location Zone 412 Engine 1 - Main Gearbox Forward Face 7 o'clock 422 Engine 2 - Main Gearbox Forward Face 7 o'clock 432 Engine 3 - Main Gearbox Forward Face 7 o'clock 442 Engine 4 - Main Gearbox Forward Face 7 o'clock

 (2)  
Access Panel
 415 Left Thrust Reverser Half - Engine 1
 425 Left Thrust Reverser Half - Engine 2
 435 Left Thrust Reverser Half - Engine 3
 445 Left Thrust Reverser Half - Engine 4

 D.  
Prepare to Service the High Pressure Controller

 S 043-002
 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.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL O-RING FILTER PLUG FILTER SPRING CONTROLLER HIGH PRESSURE 2 FILTER PLUG O-RING  1  O-RING 
SEE  A 
CONTROLLER HIGH PRESSURE BSEE 
CONTROLLER PRESSURE B VIEW LOOKING AFT (REF) 
(REF) CONTROLLER PRESSURE 
2 1  ALTERNATIVE PREFERRED  FWD  A 
Figure 301 High Pressure Controller Air Filter Replacement 

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (1)  
Do the deactivation procedure for the thrust reverser for ground maintenance (AMM 78-31-00/201).

 S 013-010

 (2)  
Open the left fan cowl panel (AMM 71-11-04/201).

 S 013-011

 (3)  
Open the left core cowl panel (AMM 71-11-06/201).

 S 013-012
 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.
 (4)  
Open the left half of the thrust reverser (AMM 78-31-00/201).
　
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