32-41-14
 ALL  ú ú 01 Page 405 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (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

 E.  
Procedure

 S 434-065
 (1)
Lubricate the threads of the pressure switch, the O-rings, and the backup rings with hydraulic fluid or hydraulic assembly lube.

 S 434-067

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

 S 424-069

 (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, DS1887, to the pressure switch.

 S 714-071
 (4)
Do these steps to do on operational test of the pressure switch:

 (a)  
Supply electrical power (AMM 24-22-00/201).

 (b)  
Make sure the power is removed from hydraulic system 4 (AMM 24-22-00/201).

 (c)  
Make sure the pressure in hydraulic system 4 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 4 (AMM 31-61-00/001).
 (d)  In necessary, do these steps to decrease the pressure in hydraulic system 4 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 system 4 is less than 1400 psi.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 32-41-14
 ALL  ú ú 01 Page 406 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 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.
 (e)  
Pressurize hydraulic system 1 (AMM 29-11-00/201).

 (f)  
Do a check of these indications: 1) Make sure the BRAKE SOURCE light on the Captain's Main Instrument Panel, P1, is not on.

 2)  Make sure the EICAS message BRAKE SOURCE (caution) does not show on the top EICAS display.

 (g)
After hydraulic system 1 is pressurized for at least two minutes do a check for leaks at the pressure switch.

 (h)  
Remove the power from hydraulic system 1 (AMM 29-11-00/201).

 (i)  
Make sure the power is removed from hydraulic system 2 (AMM 29-11-00/201).

 (j)  
Look at the pressure indication for hydraulic system 1 on the EICAS hydraulic synoptic display (AMM 31-61-00/001).

 (k)  
Slowly push one set of brake pedals to the limit of travel, hold momentarily, and then release. Continue this cycle of manual brake operation to bleed down the pressure in hydraulic system 1.

 (l)  
As the pressure indication for hydraulic system 1 decreases to 1400 psi and less, do a check of these indications: 1) Make sure the BRAKE SOURCE light, on the P1 panel, comes

 on. 2) Make sure the EICAS message BRAKE SOURCE (caution) shows on the top EICAS display.
 S 614-073
 (5)  
Do a check of the fluid level in the reservoir for hydraulic system 1.

 (a)  
Fill up the reservoir to the correct level if the fluid level is low (AMM 12-12-01/301).

 S 614-037
 (6)  
Do a check of the fluid level in the reservoir for hydraulic system 2.

 (a)  
Fill up the reservoir to the correct level if the fluid level is low (AMM 12-12-01/301).
　
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