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 (1)  The table that follows contains port/label and bit data. This information is necessary when you do the test of the pressure switch on the control module for the steering system for the body landing gear.
 ~.................................................................. | BIT TABLE | .................................................................... | | Bit Condition | .................................................................... | Switch | Port/Label | Bit | 0 | 1 | .................................................................... | L BODY GEAR | C/026/005/10 | 15 | NO PRESSURE | PRESSURE | | PRESS | | | | | .................................................................... | R BODY GEAR | C/026/004/01 | 15 | NO PRESSURE | PRESSURE | | PRESS | | | | | 2.............…..............….........….............….............1
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 32-53-05
 ALL  ú ú 01 Page 403 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 B. Special Tools and Equipment
 (1)  
78169-T2 - Crowfoot Wrench ; Abex Corp., Aerospace Div., Oxnard, California, U.S.A.

 C.
Consumable Materials

 (1)  
D00153 Hydraulic Fluid - BMS 3-11

 D.
References

 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 29-11-00/201, Main Hydraulic Supply System

 (3)  
AMM 32-00-30/201, Landing Gear Door Locks

 (4)  
AMM 32-21-03/201, Nose Gear Torsion Links

 (5)  
AMM 32-53-11/201, Body Gear Steering Acuators and Yoke Assembly

 (6)  
IPC 32-53-05 Fig. 1

 (7)  
SSM 32-53-01

 (8)  
WDM 32-53-12

 E.
Access

 (1)  
Location Zone
 755 Body Landing Gear, LH
 765 Body Landing Gear, RH

 F.
Install the Pressure Switch (Fig. 401)

 S 494-010
 WARNING: REFER TO AMM 32-00-30/201 FOR THE LOCK INSTALLATION PROCEDURE.
_______ THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (1)  
Make sure that you install the door locks of the wing and the body landing gear (AMM 32-00-30/201).

 (2)  
Lubricate the O-ring with hydraulic fluid.

 (3)  
Install the new O-ring on the pressure switch.

 S 644-011
 S 434-012
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 32-53-05
 ALL  ú ú 01 Page 404 ú Oct 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 S 424-013
 (4)  
Install the pressure switch in the module assembly with the crowfoot wrench and tighten the switch 90 to 110 pound-inches.

 S 434-014

 (5)
Connect the electrical connector to the applicable control module:

 (a)  
Left control module 1) Electrical connector DX358B of the pressure switch

 (b)  
Right control module 1) Electrical connector DX343B of the pressure switch.

 S 864-015
 WARNING: MAKE SURE THAT ALL PERSONS AND EQUIPMENT ARE AWAY FROM THE NOSE
_______ AND THE BODY GEAR BEFORE YOU PRESSURIZE THE HYDRAULIC SYSTEMS (AND OPERATE THE STEERING SYSTEMS). THE COMPONENTS THAT MOVE CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (6)  
Supply hydraulic power to system No. 1 (AMM 29-11-00/201).

 S 794-016

 (7)  
Do a check on the hydraulic connections for leaks.

 G.
Pressure Switch Test

 S 014-017
 (1)  
Disconnect the trunnion links of the nose landing gear at the apex (AMM 32-21-03/201).

 S 014-018

 (2)  
Disconnect the steering actuators of the body landing gear from the torsion link (AMM 32-53-11/201).

 S 864-019

 (3)  
Supply electrical power (AMM 24-22-00/201).

 S 864-020

 (4)  
Close the circuit breakers as follows:
　
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本文鏈接地址：747-400 AMM 飛機維護手冊 起落架 LANDING GEAR 8(80)