E.
Do the Servicing of the High Pressure Controller
S 033-003
(1)
Remove the filter plug and associated components from the high pressure controller.
(a)
Discard the O-ring(s).
S 893-016
(2) Refer to the United Technologies/Hamilton Standard manual for the the procedure to clean the air filter (CMM 36-12-02/401).
NOTE: The filter can be cleaned or replaced.
____
S 433-006
(3)
Install new O-ring(s) on the filter plug.
S 643-007
(4)
Use the antiseize compound to lubricate the threads of the filter plug.
S 433-008
(5)
Install the filter plug and associated components in the port of the high pressure controller.
(a)
Tighten the filter plug to 70-80 pound-inches (8-9 N.m).
(b)
Install the lockwire.
F.
Put the Airplane Back to Its Usual Condition
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747-400 MAINTENANCE MANUAL
S 413-009
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 half of the thrust reverser (AMM 78-31-00/201). S 413-013
(2)
Close the left core cowl panel (AMM 71-11-06/201). S 413-014
(3)
Close the left fan cowl panel (AMM 71-11-04/201). S 443-015
(4)
Do the activation procedure for the thrust reverser (AMM 78-31-00/201).
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747-400 MAINTENANCE MANUAL
HIGH PRESSURE CONTROLLER - REMOVAL/INSTALLATION
_______________________________________________
1. General_______
A. This procedure contains two tasks. The first task removes the high pressure controller. The second task installs the high pressure controller. The second task also does a test for the installation of the high pressure controller.
B. These tasks are the same for each engine.
C. The high pressure controller is installed on the forward face of the main gearbox of the engine. It is at the 7:00 o'clock position. It is necessary to open the left half of the thrust reverser to get access to the high pressure controller.
TASK 36-11-06-004-001
2. Remove the High Pressure Controller (Fig. 401)______________________________________________
A. References
(1)
24-22-00/201, Manual Control
(2)
36-11-20/401, Pressure Controller
(3)
71-11-04/201, Fan Cowl Panels
(4)
71-11-06/201, Core Cowl Panels
(5)
78-31-00/201, Thrust Reverser System
B.
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
C.
Prepare to Remove the High Pressure Controller
(1)
Supply electrical power (Ref 24-22-00/201).
S 864-003
(2)
For the applicable engine: Open this circuit breaker and attach a DO-NOT-CLOSE tag:
(a)
P6 Main Power Distribution Panel
1) 6H32 AIR SUPPLY CONT 1 PWR
2) 6H33 AIR SUPPLY CONT 2 PWR
3) 6H34 AIR SUPPLY CONT 3 PWR
