S 864-045

 (29)
 Put the thrust reverser in the half-open position.

 S 794-032

 (30)
 Dry motor the engine (Ref 71-00-00/201).

 S 794-033

 (31)
 Examine the valve flanges for leakage.

 (a)  
If bubbles come slowly into view, the quantity of leakage is satisfactory.

 (b)  
If bubbles come quickly into view, or if jet blast leakage occurs, you must repair the cause of the leakage.

 E.
Put the Airplane Back to Its Usual Condition

 S 414-049
 WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO CLOSE THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS WHEN YOU CLOSE THE THRUST REVERSERS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (1)  
Close the left thrust reverser (Ref 78-31-00/201).

 S 414-050

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

 S 414-051

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

 S 444-052

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

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

 S 864-035
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 ALL  ú ú 02P Page 411 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 PRESSURE CONTROLLER - SERVICING
_______________________________
 1.  General_______
 A.  This procedure contains one task. It replaces the air filter for the pressure controller. The 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 pressure controller.
 TASK 36-11-20-613-011
 2.  Service the Pressure Controller (Fig. 301)_______________________________
 A.  Consumable Materials
 (1)
D00669, Grease-Lithium, MO-Lith No. 2

 B.  
References

 (1)
36-00-00/201, Pneumatic System

 (2)
71-11-04/201, Fan Cowl Panels

 (3)
71-11-06/201, Core Cowl Panels

 (4)
78-31-00/201, Thrust Reverser System

 (5)
IPC 36-11-20 Fig. 1

 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 Do the Servicing of the Pressure Controller

 (1)
Release the pressure in the pneumatic system (Ref 36-00-00/201).

 S 863-002
 S 043-012
 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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 36-11-20
 ALL  ú ú 01P Page 301 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
HIGH PRESSURE CONTROLLER (REF)
SEE A 
O-RING 
HIGH PRESSURE 
CONTROLLER (REF) 
FILTER 
SPRING 
FILTER 
PRESSURE  PLUG 
CONTROLLER 
VIEW LOOKING AFT 
B 

BSEE CONTROLLER PRESSURE 
FWD  A 
Pressure Controller Air Filter Replacement Figure 301 

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