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A
747-400 MAINTENANCE MANUAL
 S 424-057
 (5)  
Align spring assemblys and hook (17). Install bolt (18) with washers (13) and (14) under the head. Install washer (14) and nut (16). Torque to 100 lb-in (0.11 N-m). Loosen as needed to install cotter pin (15). View A-A.

 S 424-058

 (6)  
Install hydraulic actuator per (AMM 32-32-14/401).

 S 984-059

 (7)
Manually move the uplock hook to the closed (gear up) position.

 NOTE: You can use a metal uplock actuating tool to move the uplock
____
 hook to the closed position (Fig. 402).

 S 864-060
 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.
 (8)  
Pressurize hydraulic system 4 (AMM 29-11-00/201).

 S 714-061

 (9)
Move the control handle for the landing gear to the DN position.

 (a)  
Make sure the uplock hook moves to the open position and stays.

 F.
Put the Airplane to Its Usual Condition

 S 864-062
 (1)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P6, Main Power Distribution Panel
 1) 6C28, ALT LG EXT NOSE

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747-400 MAINTENANCE MANUAL
 2) 6C31, ALT LG EXT BODY L 3) 6C32, ALT LG EXT BODY R
 S 864-063
 (2)  
Remove the pressure from hydraulic system 4 (AMM 29-11-00/201). S 024-064

 THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.

 (3)
Do this task: "Landing Gear Door Lock Removal" (AMM 32-00-30/201).

 WARNING:_______ YOU MUST CAREFULLY DO THE STEPS IN THE TASKS BELOW TO REMOVE
 THE DOOR LOCKS FROM THE LANDING GEAR DOORS.  THE DOORS CAN
 CLOSE QUICKLY IF YOU DO NOT REMOVE THE DOOR LOCKS CORRECTLY.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 WING LANDING GEAR UPLOCK ACTUATOR - REMOVAL/INSTALLATION
________________________________________________________
 1. General
_______
 A. This procedure contains these two tasks:
 (1)
The removal of the uplock actuator for the wing landing gear

 (2)
The installation of the uplock actuator for the wing landing gear.

 B.
To remove the uplock actuator these operations are necessary:

 (1)
Disconnect the hydraulic lines from the actuator.

 (2)
Disconnect the actuator at the rod end and the head end.

 (3)
Remove the actuator.

 (4)
Remove the hydraulic fittings from the actuator.

 C.
To install the uplock actuator these operations are necessary:

 (1)
Install the hydraulic fittings in the actuator.

 (2)
Extend the actuator and fill it with hydraulic fluid.

 (3)
Install the actuator.

 (4)
Connect the hydraulic lines to the actuator.

 (5)
Make sure the uplock hook operates correctly.

 (6)
Make sure the uplock actuator does not have leaks.

 TASK 32-32-14-004-001
 2. Wing Landing Gear Uplock Actuator Removal
　
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