747-400 AMM 飞机维护手册 指示/记录系统 1(127)

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747-400 MAINTENANCE MANUAL
 NOSE LANDING GEAR LOAD SENSOR - REMOVAL/INSTALLATION
____________________________________________________
 1.  General_______
 A.  There are two tasks in this subject. The first task is the removal of a load sensor from the nose landing gear. The second task is the installation of a load sensor in the nose landing gear. The installation task also contains two zero adjustment procedures and the null adjustment procedure for the load sensors on the nose landing gear.
 B.  One zero adjustment is done with the airplane on jacks; the other is done without jacks. Refer to the installation task to see if the nose landing gear must be on jacks.
 C.  There are four load sensors installed in the axle of the nose landing gear. Two sensors are installed in each end of the axle between the strut and the wheel. The sensors are installed on the two in-axle mount assemblies. Two mounting adapters attach each sensor to the in-axle mount.
 D.  The sensors send signals to the weight and balance computer (WBC). The signals give the weight on the nose landing gear.
 TASK 31-41-06-004-001
 2.  Nose Landing Gear Load Sensor Removal_____________________________________
 A.  General
 (1)  It is not necessary to lift the airplane on jacks when you remove a load sensor from the nose landing gear. (It can be necessary to lift the airplane on jacks when you do the zero adjustment after installation of the replacement sensor. The installation task gives the conditions when jacks are necessary.)
 B.  Standard Tools and Equipment
 (1)  Socket for Axle Nut - MIT65B01202-1
 C.  References
 (1)  AMM 09-11-00/201, Towing
 D.  Access
 (1)  Location Zone
 715 Nose Landing Gear

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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

Nose Gear Load Sensor Location
Figure 401 (Sheet 1)

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 ALL  ú ú 01 Page 402 ú Oct 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL

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AXLE
SENSOR INBOARD OUTBOARD CABLES RING RING SENSORS
AXLE IAM AND SENSOR ASSEMBLY INSTALLED IN AXLE A-A
Nose Gear Load Sensor Location Figure 401 (Sheet 2)
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 31-41-06
 ALL  ú ú 01 Page 403 ú Oct 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 S 864-091
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  
P414 Power Distribution Center - Left
 1) 414K20 WT & BAL

 (b)  
P415 Power Distribution Center - Right
 1) 415G21 WBS CHB ALT

 

 S 494-082
 WARNING: MAKE SURE THE GROUND LOCKS ARE INSTALLED ON ALL THE LANDING
_______ GEAR. WITHOUT THE GROUND LOCKS, THE LANDING GEAR CAN RETRACT AND CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
 (2)  
Make sure the ground locks are installed on the nose and main landing gear (AMM 09-11-00/201).

 S 014-085

 (3)  
Remove the hubcap from the wheel.

 S 024-044

 (4)  
Remove the sensor (Fig. 402):

 (a)  
Remove the nameplate from nameplate attachment (1) at the top of the outboard ring.

 (b)  
Disconnect the electrical cable from the electrical connector

 (4) of the sensor.

 (c)  
Loosen the inboard mounting bolt (10) on the inboard mounting adapter until it rotates freely.

 (d)  
Remove the outboard mounting bolt (7) and the outboard antirotation washer (6) from the outboard mounting adapter.
　
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