(8)  
Do the steps that follow if you must replace the high pressure controller (4) with a new high pressure controller:

 (a)  
Remove the fittings from the high pressure controller (4). 1) Remove the unions (9). 2) Discard the O-rings (10).

 TASK 36-11-06-404-011
 3.  Install the High Pressure Controller (Fig. 401)____________________________________
 A. Consumable Materials
 (1)  
D01062, Never-Seez, Pure Nickel Special, NSBT-8N
 (High temperature anti-seize compound)

 (2)  
G00095 Detector - Leak, Leak-Tek (160X)

 (3)  
D00062 Lubricant - Pneumatic System Thread, FS 1292 (Fluor-Silicone) MIL-G-4343

 B.
References

 (1)  
20-11-15/401, Bonding Jumpers and Ground Leads

 (2)  
20-22-01/601, Electrical Bonding

 (3)  
24-22-00/201, Manual Control

 (4)  
71-00-00/201, Power Plant

 (5)  
71-11-04/201, Fan Cowl Panels

 (6)  
71-11-06/201, Core Cowl Panels

 (7)  
78-31-00/201, Thrust Reverser System

 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.
Install the High Pressure Controller

 S 434-012
 (1)  
Do the steps that follow if you must install a new high pressure controller (4):

 (a)  
Install the fittings on the high pressure controller. 1) Apply the lubricant to the O-rings (10). 2) Apply anti-seize compound to the threads of the unions (9). 3) Install an O-ring on each union. 4) Install the unions in the high pressure controller.

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A
747-400 MAINTENANCE MANUAL
 (2)  S 424-013Use the three mounting bolts (6), and the washers (7) to install the high pressure controller (4) on the engine.
 (3)  S 434-014Use the bolt (8),the washer (12) and the nut (11) to connect the bonding jumper (3) to the ground strap (Ref 20-11-15/401).
 (4)  S 764-015Make sure the resistance between the bolt (8) and the ground strap of the high pressure controller is less than 0.005 ohms (Ref 20-22-01/601).
 (5)  S 644-039Apply anti-seize compound to the threads of the unions (9).
 (6)  S 434-016Remove the protective caps from the tubes.
 (7)  S 034-035Connect the high pressure tube (2) to the applicable union (9) on the high pressure controller (4).
 (8)  S 034-036Connect the signal pressure tube (2) to the applicable union (9) on the high pressure controller (4).
 (9)  S 864-017Put the applicable ENGINE BLEED switch to the ON position.
 S 794-018

 (10)
 Apply the leak detector to the tube connections.

 S 034-019

 (11)
 Make sure the electrical connector DM7191 (1) is not connected.

 S 864-020

 (12)
 For the applicable engine: Remove the DO-NOT-CLOSE tag and close this circuit breaker:

 (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 4) 6H35 AIR SUPPLY CONT 4 PWR

 S 794-021
 (13)
 Dry motor the engine (Ref 71-00-00/201).

 (a)  
Examine the tube connections for leakage.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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A
747-400 MAINTENANCE MANUAL
 (b)  Repair the tube connections if there is leakage.
　
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