(h)  
Loosen the nut (15) to permit the installation of the cotter pin.

 (i)  
Remove the plugs and the caps from the hydraulic lines (8 and 9).

 (j)  
Connect the hydraulic lines (8 and 9) to the actuator.

 (6)  
Put the control handle for the landing gear in the OFF position.

 S 864-009
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 S 714-027
 (7)  
Do a check of the actuator operation:

 (a)
Manually move the hook to the closed (gear locked) position.

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

 (b)  
Make sure the uplock actuator hook moves and does not catch on equipment.

 (c)  
Manually move the uplock hook to the open (gear down) position.

 S 864-028
 WARNING: MAKE SURE THAT PERSONS AND EQUIPMENT ARE CLEAR OF ALL CONTROL
_______ SURFACES BEFORE YUOU SUPPLY HYDRAULIC POWER. AILERONS, RUDDERS, ELEVATORS, FLAPS, SPOILERS, LANDING GEAR, AND THRUST REVERSERS CAN MOVE QUICKLY WHEN YOU SUPPLY HYDRAULIC POWER. THIS CAN CASUE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (8)  
Pressurize hydraulic system No. 4 (AMM 29-11-00/201).

 S 794-013

 (9)  
Do a check of the uplock actuator for leaks:

 (a)  
Put the control handle in the DN position.

 (b)  
Make sure there are no leaks in the hydraulic connections.

 S 094-021
 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. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (10)
 Do this task:  "Body Landing Gear Door Lock Removal" (AMM 32-00-30/201).

 S 094-017

 (11)
 Do this task:  "Wing Landing Gear Door Lock Removal" (AMM 32-00-30/201).

 (12)
 Remove hydraulic power if it is not necessary (AMM 29-11-00/201).

 S 864-015
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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

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

 B.
To remove the downlock actuator these steps are necessary:

 (1)  
Bleed the pressure from the retract side of the actuator.

 (2)  
Disconnect the actuator hydraulic connections.

 (3)  
Remove the downlock actuator.

 C.
To install the downlock actuator these steps are necessary:

 (1)  
Install the actuator with the attach bolts.

 (2)  
Connect the hydraulic lines to the actuator.

 (3)  
Do a check of the hydraulic connections for leaks.

 TASK 32-32-15-004-001
 2. Wing Landing Gear Downlock Actuator 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)  
AIPC 32-11-01, Fig. 1

 (5)  
AIPC 32-32-15, Fig. 1

 (6)  
AIPC 32-32-16, Fig. 2

 B.
Access

 (1)  
Location Zone
 735 Wing Landing Gear, LH
 745 Wing Landing Gear, RH
　
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