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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 424-016
 (6)  
Install the hydraulic brake:

 (a)  
Lower the hydraulic brake into the position.

 (b)  
Install the bolt (9), the washer (5) and the nut (3) at the front outboard corner.

 (c)  
Install the washers (5) and the nuts (3) on the studs at the remaining corners.

 (d)  
Tighten the nuts equally.

 S 434-017
 (7)  
If it is necessary, install the adapter (6) with the nut (7), and the new packing (8).

 S 434-018

 (8)  
Connect the hydraulic lines H1, H2, and H3.

 S 374-019

 (9)  
Apply a thin layer of primer to the open metal surfaces around the brake mounting flange.

 S 864-035

 (10)
 Set the STAB TRIM 2 and 3 switches to ON.

 S 864-034

 (11)
 Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P7, Overhead Circuit Breaker Panel
 1) 7E7, L STAB TRIM S/O VLV
 2) 7E20, R STAB TRIM S/O VLV

 F.
Do a Test of the Hydraulic Brakes

 S 864-020
 (1)  Make sure that a person in the 48 section can hear you in the control cabin.
 S 864-038
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
_______ SURFACES BEFORE YOU SUPPLY HYDRAULIC POWER. AILERONS, RUDDERS, ELEVATORS, FLAPS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS CAN MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (2)  Do this task to pressurize the hydraulic systems No. 2 and No. 3: "Supply Hydraulic Power" (AMM 29-11-00/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 S 714-028
 (3)  
Do a test of the hydraulic brakes:

 (a)  
For the left hydraulic brake, Set the STAB TRIM 3 switch on the control stand to ON and the STAB TRIM 2 switch to CUTOUT.

 (b)  
For the right hydraulic system, Set the STAB TRIM 3 switch to CUTOUT and the STAB TRIM 2 switch to ON.

 (c)  
Push the manual brake bypass valve switch (which is referred to as the "bypass valve switch") on the applicable stabilizer trim control module (STCM). 1) Hold the bypass valve switch in this position. 2) Hold the STAB TRIM ALTN switches on the control stand to

 the APL NOSE UP position for ten seconds. 3) Make sure that there is no movement of the stabilizer ballscrew. 4) Release the bypass valve switch.

 (d)  
Hold the STAB TRIM ALTN switches to the APL NOSE DN position for five seconds. 1) Make sure the stabilizer position indicators move to APL

 NOSE DN.

 (e)  
Hold the STAB TRIM ALTN switches to the APL NOSE UP position for five seconds. 1) Make sure the stabilizer position indicators move to APL

 NOSE UP.

 (f)  
Push the bypass valve switch on the applicable STCM. 1) Hold the bypass valve switch in this position. 2) Hold the STAB TRIM switches on the captain's control wheel

 to the NOSE UP position for ten seconds. 3) Make sure that there is no movement of the stabilizer ballscrew. 4) Release the bypass valve switch.

 (g)  
Hold the STAB TRIM switches on the captain's control wheel to the NOSE DN position for five seconds. 1) Make sure the stabilizer position indicators move to APL

 NOSE DN.

 (h)  
Hold the STAB TRIM switches on the captain's control wheel to the NOSE UP position for five seconds. 1) Make sure the stabilizer position indicators move to APL

 NOSE UP.
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