S 864-028
(5)
Remove the electrical power (AMM 24-22-00/201).
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A
747-400 MAINTENANCE MANUAL
BODY GEAR STEERING MODULE SERVOVALVE - REMOVAL/INSTALLATION
___________________________________________________________
1. General_______
A. This procedure removes and installs the servovalve of the steering module of the body landing gear.
TASK 32-53-07-004-001
2. Body Gear Steering Module Servovalve Removal____________________________________________
A. References
(1)
AMM 09-11-00/201, Towing
(2)
AMM 29-11-00/201, Main Hydraulic Supply System
(3)
AMM 32-00-30/201, Landing Gear Door Locks
(4)
IPC 32-53-05 Fig. 1
(5)
SSM 32-53-02
(6)
WDM 32-53-13
B.
Access
(1)
Location Zone
755 Body Landing Gear, LH
765 Body Landing Gear, RH
C.
Servovalve Removal (Fig. 401)
S 864-002
(1) Make sure that you install the ground locks of the landing gear (AMM 09-11-00/201).
S 494-003
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.
(2)
Install the door locks of the wing and the body landing gear (AMM 32-00-30/201).
S 864-004
(3)
Open the circuit breakers as follows for the steering system of the body landing gear:
(a)
P7 Overhead Circuit Breaker Panel
1) 7G23 BODY GR STRG ARM AC
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A 747-400 MAINTENANCE MANUAL
SEE A
CAPSCREW
SERVOVALVE
SEAL PLATE
CONTROL FWDMODULE
A
Body Gear Steering Control Valve Servovalve Installation Figure 401
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A
747-400 MAINTENANCE MANUAL
2) 7G24 BODY GR STRG ARM DC.
S 864-005
(4)
Remove the hydraulic pressure of system No. 1 (AMM 29-11-00/201).
S 034-006
(5)
Disconnect the electrical connector from the applicable servovalve.
(a)
Right control module 1) Servovalve electrical connector DX343C
(b)
Left control module 1) Servovalve electrical connector DX358C.
S 024-007
(6)
Remove the mounting screws and lift the servovalve from the control module.
S 034-008
(7)
Remove the seal plate from the module.
TASK 32-53-07-404-009
3. Body Gear Steering Module Servovalve Installation_________________________________________________
A. Consumable Materials
(1)
D00153 Hydraulic Fluid, BMS 3-11
B.
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 Actuators and Yoke Assembly
