B.
The nose gear steering actuators are double acting hydraulic actuators with external fluid transfer tubes.
(1)
Mounting trunnions on the actuators are attached between steering plates fixed to the aft side of the nose gear shock strut outer cylinder.
C.
To remove the steering actuator these steps are necessary:
-
Remove the cables from trunnion pivot link drum
-
Remove the steering metering valve
-
Remove the steering summing mechanism
-Disconnect the steering actuator rod ends from the steering collar clevis
-
Remove the steering collar
-
Remove the steering actuator and support plates
-
Seperate the steering actuators from support plates.
D.
To install the steering actuator these steps are necessary:
-Assemble the actuators and support plates on the shock strut
-
Install the support plate attach bolts
-
Install the steering collar
-
Install the actuator rod end in the steering collar clevis
-
Install the steering summing mechanism
-
Install the steering metering valve
-Test the steering system operation.
TASK 32-51-05-004-001
2. Nose Gear Steering Actuator Removal___________________________________
A. Special Tools and Equipment
(1) G12001 - Rigging pin - NS-4, 0.311 (+0.000/-0.002)-inch diameter,
2.50 inch length
NOTE: Rigging pin is part of G12001 tool kit.
____
(2)
OHME65B01519-1 - Steering Cylinder Sling
(3)
ST2580-315 - Torque Wrench Adapter
(4)
2ME65B00162 - Torsion Link Support Tool
B.
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)
AMM 32-51-00/501, Nose Wheel Steering System
(5)
AMM 32-51-04/401, Steering Metering Valve
(6)
AMM 32-51-06/401, Nose Gear Steering Collar
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
32-51-05
ALL ú ú 01 Page 401 ú Oct 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(7)
AIPC 32-51-00 Fig. 1
(8)
AIPC 32-51-04 Fig. 1
(9)
AIPC 32-51-06 Fig. 2,
(10)
AIPC 32-51-60 Fig. 1
C.
Access
(1)
Location Zone
715 Nose Landing Gear
D.
Prepare for Removal
S 494-003
WARNING: YOU MUST CAREFULLY INSTALL THE GROUND LOCKS IN ALL LANDING
_______ GEAR. AN ACCIDENTAL RETRACTION OF THE LANDING GEAR CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(1) Install the ground locks in all landing gear (AMM 09-11-00/201).
S 494-034
WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. 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)
Do this task: "Installation of the Door Locks on the Nose Gear Landing Gear" (AMM 32-00-30/201).
S 494-036
(3)
Do this task: "Installation of the Door Locks on the Wing Gear Landing Gear" (AMM 32-00-30/201).
S 494-037
(4)
Do this task: "Installation of the Door Locks on the Body Gear Landing Gear" (AMM 32-00-30/201).
S 864-004
(5)
Do this task: "Hydraulic System Depressurization"
(AMM 29-11-00/201).
