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D. Remove the Pressure Switch
S 034-007
(1)
Disconnect the electrical connector from the pressure switch.
S 024-008
(2)
Remove the pressure switch from the shuttle valve.
S 494-009
(3)
Install a plug in the valve.
TASK 32-32-18-404-023
3. Install the Pressure Switch in the Truck Positioner Shuttle Valve (Fig. 401)_________________________________________________________________
A. References
(1)
AMM 12-12-01/301, Hydraulic Systems - Servicing
(2)
AMM 24-22-00/201, Electrical Power - Control
(3)
AMM 29-11-00/201, Pressurize/Depressurize Main Hydraulic System
(4)
AMM 32-00-15/201, Landing Gear Door Locks
B.
Access
(1)
Location Zones
551 Wing Trailing Edge (Left)
651 Wing Trailing Edge (Right)
C.
Procedure to Remove the Pressure Switch
S 094-010
(1)
Remove the plug from the shuttle valve.
S 434-011
(2)
Install packing on the pressure switch.
S 424-012
(3)
Install the pressure switch in the shuttle valve and tighten.
S 894-013
(4)
Remove the DO-NOT-CLOSE tag and close this circuit breaker on the overhead circuit breaker panel, P11:
(a)
11G11, AUTO SPEED BRAKE
D.
Do the steps that follow to make sure the pressure switch operates correctly:
(1)
Pressurize the left hydraulic system (AMM 29-11-00/201).
S 864-014
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S 864-016
(2)
Make sure the control lever for the landing gear lever is in the OFF position.
S 864-015
(3)
Put the speed brake lever on the center control stand in ARMED.
S 214-016
(4)
Make sure the AUTO SPDBRK light on the pilots' overhead panel, P5, is off.
S 714-017
(5)
Move the control lever for the landing gear from OFF to DN.
S 214-018
(6)
Make sure the shuttle valve and pressure switch do not have any leaks.
E.
Put the Airplane Back to Its Usual Condition
S 864-019
(1) Make sure the fluid in the hydraulic reservoir is at the correct level. Fill if it is neccessary (AMM 12-12-01/301).
S 094-020
WARNING: USE THE PROCEDURE IN AMM 32-00-15/201 TO REMOVE THE DOOR LOCKS.
_______ THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(2)
Remove the door locks from the landing gear and close the doors (AMM 32-00-15/201).
S 864-021
(3)
Remove the pressure from the left hydraulic system if it is not necessary (AMM 29-11-00/201).
(4)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
S 864-022
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MAIN GEAR EXTENSION/RETRACTION HYDRAULIC FLOW FUSES -
_____________________________________________________ MAINTENANCE PRACTICES
_____________________
1. General_______
A. This procedure has the tasks that follow:
(1)
Removal of the hydraulic fuse from the truck positioner shuttle valve on the main landing gear
(2)
Removal of the extension/retraction hydraulic fuses for the main landing gear
(3)
Installation of the hydraulic fuse on the truck positioner shuttle valve
(4)
Check of the hydraulic fuse on the truck positioner shuttle valve
(5)
Installation of the extension/retraction hydraulic fuses
(6)
Check of the extension/retraction hydraulic fuses. Hydraulic flow fuse reset
B.
A hydraulic flow fuse is installed in the truck positioner shuttle valve module for the left main landing gear. For the right main landing gear, there are two hydraulic flow fuses. One is in the gear up circuit and the other is in the gear down circuit. They are located on the keel beam in the right wheel well next to the door actuator or on the ceiling of the wheel well.
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