S 494-023

 (3)  
Do this task: "Installation of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).

 F.
Procedure

 S 424-027
 (1)  
Do these steps to install the air charging valve.

 (a)  
Lubricate a new O-ring and install it on the air charging valve.

 (b)  
Lubricate the threads of the air charging valve.

 (c)  
Install the air charging valve into the manifold.

 (d)  
Safety with lockwire

 (2)  
Fill the surge accumulator with gas (AMM 12-15-11/301).

 (3)  
Pressurize hydraulic system No. 4 (AMM 29-11-00/201).

 S 864-017

 (4)  
Do these steps to do a check of the installation of the air charging valve:

 (a)  
Set the parking brake.

 S 614-014
 S 864-016
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400
MAINTENANCE MANUAL

 (b)  
Make sure the pressure indication on the pressure gage for the parking brake accumulator is 3000 |200 psi.

 (c)  
Do a check for leaks at the fittings of the surge accumulator air charging valve.

 (d)  
Release the parking brake.

 (e)  
Look at the charging instructions marker adjacent to the surge accumulator.

 (f)  
Make sure the pressure indication on the pressure gage of the surge accumulator goes back to the correct precharge pressure as shown on the charging instructions marker.

 G.
Put the Airplane Back to Its Usual Condition

 S 864-019
 (1)  If it is necessary, set the parking brake.
 S 094-020
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT REMOVE THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  
Do this task: "Removal of the Door Locks on the Wing Landing Gear" (AMM 32-00-30/201).

 S 094-024

 (3)  
Do this task: "Removal of the Door Locks on the Body Landing Gear" (AMM 32-00-30/201).

 (4)  
Remove electrical power, if it is not necessary (AMM 24-22-00/201).

 S 864-026

 (5)  
Remove the pressure from hydraulic system No. 4 if it is not necessary (AMM 29-11-00/201).

 S 864-025
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 HYDRAULIC PRESSURE SURGE ACCUMULATOR PRESSURE GAGE -
__________________________________________________ REMOVAL/INSTALLATION
____________________
 1.  General_______
 A.  This procedure contains two tasks:
 (1)  
The removal of the pressure gage for the hydraulic pressure surge accumulator.

 (2)  
The installation of the pressure gage for the hydraulic pressure surge accumulator.

 B.  
There are three hydraulic pressure surge accumulators on the airplane. One is adjacent to the rear spar of the right wing, inboard of the right wing gear trunnion. One is adjacent to the rear spar of the left wing, inboard of the left wing gear trunnion. One is on the inboard bulkhead of the right body gear wheel well. Adjacent to each hydraulic pressure surge accumulator is a pressure gage. The pressure gage is used to do the servicing procedures for the hydraulic pressure surge accumulator.

 C.  
These steps are necessary to remove the pressure gage:

 (1)  
You will remove the pressure from the hydraulic system 4.

 (2)  
You will release the hydraulic fluid from the hydraulic pressure surge accumulator.
　
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