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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
K18920
A
747-400 MAINTENANCE MANUAL
 C. Parts
 ~...................................................................... | QUANTITY | NAME | AIPC # |ITEM #| ........................................................................ | 1 |Hook | 420 | 18 | ........................................................................ | 1 |Cotter Pin (CP) - Link | 225 | 19 | ........................................................................ | 1 |CP - Spring | 225 | 13 | ........................................................................ | 1 |CP - Pin | 220 | 24 | ........................................................................ | 1 |CP - Actuator Pin End | 225 | 3 | ........................................................................ | 1 |CP - Actuator Link End | 225 | 7 | 2...........….......................................…...........…......1
 D. Access
 (1)  
Location Zone
 755 Body Landing Gear, LH
 765 Body Landing Gear, RH

 E.
Install the Uplock Hook.

 S 644-047
 (1)  
Apply a thin layer of BMS 3-27 corrosion preventive compound to the threads of pivot pin (6).

 S 424-048

 (2)  
Align hook (18) with assembly. Install pivot pin (6) with head toward hydraulic actuator. Install washer (26) and nut (25), tighten nut to 100 lb-in (0.11 N-m). Loosen nut if necessary to install cotter pin (24). View C-C.

 S 644-050

 (3)  
Apply a thin layer of grease to faying surfaces of link and hook (18).

 S 424-051

 (4)  
Align hook (18) and link. Install bolt (22) with washer (23) under head. Install washer (21) and nut (20). Torque to 100 lb-in (0.11 N-m). Loosen as needed to install cotter pin (19). View B-B.

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747-400 MAINTENANCE MANUAL
 S 424-052
 (5)  
Align spring assemblys and hook (18). Install bolt (15) with washers (16) and (17) under the head. Install washer (17) and nut (14). Torque to 100 lb-in (0.11 N-m). Loosen as needed to install cotter pin (13). View A-A.

 S 424-053

 (6)  
Install hydraulic actuator per (AMM 32-33-14/401).

 S 984-032

 (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 864-033
 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 1 (AMM 29-11-00/201).

 S 714-054

 (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 864-036
 (1)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

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

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 2) 6C31, ALT LG EXT BODY L 3) 6C32, ALT LG EXT BODY R
 S 864-037
 (2)  
Remove the pressure from hydraulic system 1 (AMM 29-11-00/201). S 024-055

 THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.

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