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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL

 (f)  
Apply a thin layer of grease on the bolt that attaches the link to the uplock mechanism.

 (g)  
Put the link in the correct position on the outboard side of the uplock mechanism.

 (h)  
Install the bolt with a countersunk washer adjacent to the bolt head and a plain washer adjacent to the nut.

 S 434-039
 (5)  
Move the sensor conduit to the correct position.

 S 434-041

 (6)  
Install the clamp on the conduit.

 S 434-040

 (7)  
Tighten the conduit nuts.

 S 434-012

 (8)  
Install the uplock sensor (AMM 32-61-21/201).

 S 434-013

 (9)  
Connect the actuator rod from the uplock-operated sequence valve to the uplock mechanism (AMM 32-32-06/401).

 S 434-014

 (10)
 Connect each end of the uplock actuator to the uplock mechanism (AMM 32-32-14/401).

 S 864-016

 (11)
 Remove pressure from hydraulic system No. 4 (AMM 29-11-00/201).

 S 864-017

 (12)
 Move the control handle for the landing gear to the OFF position.

 S 984-018

 (13)
 Manually move the uplock hook to the closed (gear locked up) position.

 NOTE: If it is necessary, use a metal tool to move the uplock hook
____
 to the closed position (Fig. 402).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 S 864-049
 (14)
 For the applicable system, Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P6, Main Power Distribution Panel
 1) 6C29, ALT LG EXT WING L
 2) 6C30, ALT LG EXT WING R

 S 864-020
 (15)
 Supply electrical power (AMM 24-22-00/201).

 S 714-021

 (16)
 Do a check of the uplock release mechanism for the alternate extension system for the wing landing gear.

 CAUTION: YOU MUST KEEP THE ALTERNATE EXTENSION SWITCH IN THE ON
_______ POSITION FOR A MINIMUM OF 90 SECONDS. FAILURE TO DO THIS WILL CAUSE MALFUNCTIONS WHEN YOU RETRACT THE LANDING GEAR OR CLOSE THE LANDING GEAR DOORS.
 (a)  
Put the ALTN GEAR EXTEND WING switch in the on position.

 (b)  
Make sure the uplock hook opens.

 NOTE:____The hook must open. It can go to the closed position when the weight of the gear is not on the hook.
 S 984-022
 (17) Manually move the uplock hook to the closed (gear locked up) position.
 NOTE: If it is necessary, use a metal tool to move the uplock hook
____
 to the closed position (Fig. 402).

 S 864-047
 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.
 (18)
 Supply system No. 4 hydraulic power (AMM 29-11-00/201).

 S 714-024

 (19)
 Do a check of the hydraulic operation of the uplock mechanism for the wing landing gear.

 (a)  
Move the control handle to the DN position.

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 (b)  
Make sure the uplock hook for the wing landing gear moves to the open position.

 (c)  
Make sure the uplock hook stays in the open position.

 S 714-025
 (20) Make sure the white bar on the valve slide is between the edges of the slot (AMM 32-32-06/401).
　
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