F.  
Put the Airplane Back to Its Usual Condition

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 32-41-14
 ALL  ú ú 01 Page 407 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 S 094-075
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
_______ DOOR LOCKS FROM 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.
 (1)  
Do this task: "Removal of the Door Locks from the Wing Landing Gear" (AMM 32-00-30/201).

 S 094-077

 (2)  
Do this task: "Removal of the Door Locks from the Body Landing Gear" (AMM 32-00-30/201).

 S 844-079

 (3)  
Remove electrical power, if it is not necessary (AMM 24-22-00/201).

 TASK 32-41-14-404-041
 5. Hydraulic System 4 Pressure Switch - Installation (Fig. 401)
_________________________________________________
 A. General
 (1)  
In subsequent steps, the hydraulic system 4 pressure switch is referred to as the pressure switch.

 B.
Consumable Materials

 (1)  
D00288 Lubricant - MCS 352

 NOTE: Use BMS 3-11 or MCS 352 to lubricate
____ O-rings and fittings on the accumulator assembly.
 (2)  D00196 Hydraulic Fluid - BMS 3-11
 NOTE: Use BMS 3-11 or MCS 352 to lubricate
____ O-rings and fittings on the accumulator assembly.
 C. References
 (1)
AMM 12-12-01/301, Hydraulic Systems (Hydraulic Replenishing)

 (2)  
AMM 24-22-00/201, Manual Control

 (3)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (4)  
AMM 31-61-00/001, Integrated Display System

 (5)  
AMM 32-00-30/201, Landing Gear Door Locks

 (6)  
AIPC 32-41-14 Fig. 2

 (7)  
SSM 32-41-02

 (8)  
WDM 32-41-11

 D.
Access

 (1)  
Location Zone
 135 Wing Landing Gear Well - Left

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 ALL  ú ú 01 Page 408 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 E.  Procedure
 S 434-064
 (1)
Lubricate the threads of the pressure switch, the O-rings, and the backup rings with hydraulic fluid or hydraulic assembly lube.

 S 434-066

 (2)  
Install the O-rings and backup rings on the pressure switch.

 S 424-068

 (3)  
Do these steps to install the pressure switch:

 (a)  
Remove the plug from the port in the manifold.

 (b)  
Install the pressure switch at the port in the manifold.

 (c)  
Lockwire the pressure switch to the manifold.

 (d)  
Connect the electrical connector, DS1886, to the pressure switch.

 S 714-070
 (4)
Do these steps to do on operational test of the pressure switch:

 (a)  
If necessary, supply electrical power (AMM 24-22-00/201).

 (b)  
Make sure the power is removed from hydraulic systems 1 and 2 (AMM 24-22-00/201).

 (c)  
Make sure the pressure in hydraulic systems 1 and 2 is less than 1400 psi.

 NOTE: Use the pressure indication on the EICAS hydraulic
____ synoptic display to get a value for the pressure in hydraulic system 1 and 2 (AMM 31-61-00/001).
 (d)  In necessary, do these steps to decrease the pressure in hydraulic system 1 and 2 to less than 1400 psi: 1) Make sure the power is removed from hydraulic system 4
 (AMM 29-11-00/201). 2) Look at the pressure indications on the EICAS hydraulic synoptic display (AMM 31-61-00/001).
 3)  Slowly push one set of brake pedals to the limit of travel, hold momentarily, and then release. Do this cycle of manual brake operation until the pressure indication for hydraulic systems 1 and 2 is less than 1400 psi.
　
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