TASK 31-41-05-822-019
5. Zero Adjustment on Jacks________________________
A. General
(1)
The zero adjustment on jacks procedure records the digital voltage count of each load sensor in the weight and balance computer (WBC). This digital voltage count is recorded with mode 22. No weight is on the main landing gear.
(2)
You then use mode 99 to put the recorded digital voltage count into the WBC. You make sure that the digital voltage count is correct with mode 21.
(3)
You must calibrate the WBS after the zero adjustment on jacks.
B. 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)
AMM 31-41-00/501, Weight and Balance System Adjustment/Test
(5)
AMM 31-41-05/401, Zero Adjustment on Jacks
C. Access
(1) Location Zone 118 Electrical and Electronics Compartment, Right
D. Procedure
S 822-021
(1)
Do the zero adjustment on jacks (AMM 31-41-05/401).
(2)
Do the WBS calibration (AMM 31-41-00/501).
S 822-022
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A
747-400
MAINTENANCE MANUAL
MAIN GEAR AFT
MAIN GEAR FORWARD
PROTECTIVE COVER
PROTECTIVE COVER
SEE B
SEE A
LOAD SENSOR PROTECTIVE COVERS PROTECTIVE
PLUG (4 LOCATIONS) SCREW PROTECTIVE COVER
SEE C LOAD SENSOR
WHEEL TRUCK LUGS
PROTECTIVE COVER MAIN GEAR FORWARD (FACEPLATE REMOVED) A
PLUG
COVER
SCREW (4 LOCATIONS)
LOAD
SENSOR
SEE C
WHEEL
TRUCK
LUGS
MAIN GEAR AFT PROTECTIVE COVER (FACEPLATE REMOVED)
B
LOAD SENSOR (TOP VIEW)
C
LOAD SENSOR (SIDE VIEW)
C
Main Gear Load Sensors
L05670
Figure 205
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A
747-400 MAINTENANCE MANUAL
MAIN LANDING GEAR LOAD SENSOR - REMOVAL/INSTALLATION
____________________________________________________
1. General_______
A. There are three tasks in this procedure. The first task is the removal of a load sensor from the main landing gear. The second task is the installation and zero adjustment of a load sensor on the main landing gear. The third task is the installation of shims on the mounting lugs for the load sensors.
B. This procedure applies to all sensors on the main landing gear. The main landing gear includes both the wing and the body landing gear.
C. Each main landing gear has four load sensors. Each sensor is installed on the wheel truck lugs of the landing gear. The weight and balance system has one weight and balance computer (WBC) that reads all sensors.
TASK 31-41-05-004-137
2. Main 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 main 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. Special Tools and Equipment
(1) 4065575-901 - Alignment Clamp, Honeywell Inc., Phoenix, Arizona
C. References
(1) AMM 09-11-00/201, Towing
D. Access
(1) Location Zone
735/736 Wing Landing Gear
755/756 Body Landing Gear
E. Procedure
S 864-161
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P414 Power Distribution Center - Left 1) 414K20 WT & BAL
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