(2)
The installation of the drag strut on the nose landing gear.
TASK 32-21-04-004-001
2. Nose Landing Gear Drag Strut Removal (Fig. 401)____________________________________
A. Special Tools and Equipment
(1)
PRE65B01202-1 Protective Equipment for Tripod Apex Pin.
(2)
20HME65B01462 Nose Landing Gear Drag Strut Hoisting Tool
B.
References
(1)
AMM 07-11-02/201, Jacking Airplane Nose
(2)
AMM 09-11-00/201, Towing
(3)
AMM 29-11-00/201, Main Hydraulic Supply System
(4)
AMM 32-00-30/201, Landing Gear Door Locks
(5)
AMM 32-35-05/401, Nose landing Gear Alternate Extension Drive Unit
(6)
AMM 32-61-03/201, Nose Gear Lock Sensor
(7)
AIPC 32-21-04 Fig. 1
(8)
AIPC 32-21-05 Fig. 1
(9)
AIPC 32-34-01 Fig. 2
(10)
AIPC 32-34-02 Fig. 2
(11)
AIPC 32-35-62 Fig. 1
C.
Access
(1)
Location Zone
715 Nose Landing Gear
D.
Prepare for the Procedure
(1)
Install the ground locks in all landing gear (AMM 09-11-00/201).
S 494-039
S 494-040
WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(2) Do this task: "Installation of the Door Locks on the Nose Landing Gear" (AMM 32-00-30/201).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
32-21-04
ALL ú ú 01 Page 401 ú Oct 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
S 864-004
(3)
Release the pressure from the hydraulic system No. 1
(AMM 29-11-00/201).
S 584-005
(4)
Lift the nose of the airplane with jacks to decrease the pressure on the drag strut (AMM 07-11-02/201).
S 034-006
(5)
Remove the wire connection from the primary (S397) and the alternate (S424) lock sensor of the nose landing gear (AMM 32-61-03/201).
S 034-007
(6)
Remove the bolt (1).
(a)
Disconnect the lock actuator from the actuator crank fitting (12).
S 034-008
(7)
Disconnect the vertical links (3) from the upper drag strut and attach them out of the way.
S 034-009
(8)
Disconnect the vertical link (3) from the crank fitting
assembly (11) of the downlock.
E.
Remove the Drag Strut
S 034-010
(1) Remove the pin (7).
WARNING: MAKE SURE THAT YOU HOLD THE TRIPOD BEFORE YOU REMOVE THE
_______ PIN (7). THE UPPER TRIPOD BRACE WEIGHS APPROXIMATELY 45 POUNDS. THE LOWER TRIPOD BRACE WEIGHS APPROXIMATELY 57 POUNDS. FAILURE TO HOLD THE TRIPOD WILL RESULT IN A POSSIBLE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(a) Hold the tripod assembly to make sure the tripod will not fall when you remove the apex pin.
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32-21-04
ALL ú ú 01 Page 402 ú Feb 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
(b) (c) (d) (e) Remove the tripod apex lockbolt (5).Remove the nut (6).Install a thread protector on the pin (7).Remove the pin (7).
NOTE:____ Shake the nose gear tires backward and forward to help to remove the pin (7). Leave the lube insert (8) inside the pin (7).
1) Disconnect the lower drag strut from the upper tripod brace.
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