NOTE: Do not remove the shims (1) that are installed on the
____
wheel truck lugs.
TASK 31-41-05-404-139
3. Main Landing Gear Load Sensor Installation
__________________________________________
A. General
(1) After the installation of a load sensor you must adjust the sensor to zero. There are two zero adjustment procedures. It is necessary to do only one of the two adjustment procedures. One procedure does not require the airplane to be on jacks. The other procedure requires the airplane to be on jacks. Both procedures use the keyboard modes of the weight and balance computer (WBC).
(a)
After sensor installation, do the automatic zero adjustment (without jacks, mode 38) at these times: 1) After replacement of only one sensor on the body landing
gear. 2) After replacement of only one sensor on the wing landing gear. 3) After replacement of one sensor on the body landing gear and one sensor on the wing landing gear.
(b)
After sensor installation, do the zero adjustment on jacks (mode 99) at these times: 1) After replacement of more than one sensor on the body
landing gear. 2) After replacement of more than one sensor on the wing landing gear.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
B. Special Tools and Equipment
(1) 4065575-901 - Alignment Clamp, Honeywell Inc., Phoenix, Arizona
C. References
(1)
AMM 07-11-01/201, Jack Airplane
(2)
AMM 09-11-00/201, Towing
(3)
AMM 24-22-00/201, Manual Control
(4)
IPC 31-41-04 Fig. 1
D. Access
(1) Location Zone
735/736 Wing Landing Gear
755/756 Body Landing Gear
E. Sensor Installation
S 864-164
(1) Make sure these circuit breakers are open with DO-NOT-CLOSE tags attached:
(a)
P414 Power Distribution Center - Left
1) 414K20 WT & BAL
(b)
P415 Power Distribution Center - Right
1) 415G21 WBS CHB ALT
S 494-175
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).
(3)
Make sure the faceplate is removed from the protective cover.
S 014-113
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A
747-400 MAINTENANCE MANUAL
S 424-158
CAUTION:_______DO NOT STRETCH THE BELLOWS OF THE SENSOR. DAMAGE TO THE SENSOR CAN OCCUR IF YOU STRETCH THE BELLOWS.
(4) Install the sensor:
NOTE: Do not move the shims that are installed on the wheel truck
____
lugs.
(a) Put the sensor (7, Fig. 402) on the wheel truck lugs (6).
NOTE: On the forward sensor locations, the sensor is
____ installed with the connector end on the forward lug.
On the aft sensor locations, the sensor is installed with the connector end on the aft lug.
(b)
Put the mounting bolts (10) through the washers (9), the sensor, and the wheel truck lugs.
NOTE:____Do not use a different type of mounting bolt. Special mounting bolts are used to prevent corrosion.
(c)
Install the washer (5) and the hex nut (4) on each mounting bolt.
(d)
Tighten the hex nuts with your hand.
(e)
Install the alignment clamp on the sensor to hold the sensor bellows rigid.
(f)
Tighten the hex nuts to 75 |5 pound-inches.
(g)
Install the locknuts (3) on the mounting bolts and tighten the locknuts to 55 |5 pound-inches.
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