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A
747-400 MAINTENANCE MANUAL
E. Procedure
NOTE: You can find each step that follows in the Weight and
____
Balance System - Calibration (Recommended) task.
S 825-168
(1)
Do the Zero Adjustment on Jacks (Mode 99) (AMM 31-41-05/401).
S 865-169
(2)
Do the Prepare the Scales and the Airplane.
S 745-170
(3)
Do the How to Use WBC Mode 22.
S 975-171
(4)
Do the Collect Data at Normal Strut Pressure (Fig. 503 and 504).
S 975-172
(5)
Do the Collect Data at Low Wing Strut Pressure (Fig. 505 and 506).
S 975-173
(6)
Do the Collect Data at Normal Strut Pressure - Second Time (Fig. 507 and 508).
S 865-174
(7)
Do the Decrease Body Strut Pressure.
S 975-175
(8)
Do the Collect Data at Normal Strut Pressure - Third Time (Fig. 509 and 510).
S 865-191
(9)
Do the Put the Airplane Back to its Usual Condition.
S 865-179
(10)
Do the Find Load Sensor Zeros (Fig. 501).
NOTE: The airplane must make a minimum of one takeoff and landing
____
to complete this step.
S 975-180
(11)
Do the Calculate Y (Wheel Weight Fig. 503, 505, 507 and 509).
(12)
Do the Calculate X (Sensor Counts Fig. 504, 506, 508 and 510).
(13)
Do the Calculate Spans Values (Fig. 511).
S 975-181
S 975-182
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747-400 MAINTENANCE MANUAL
S 975-183
(14)
Do the Calculate Offset Values (Fig. 512).
S 975-184
(15)
Do the Load Sensor Resistance (Mode 23), Fig. 513.
S 975-186
(16)
Do the Put Calibration Data into Calibration Module.
S 865-187
(17)
Do the Calibration Check (Compare Mode 01 data with Scales Data) (Fig. 514).
S 975-188
(18)
Do the Make a Record of Calibration Data.
S 865-189
(19)
Do the Put the Airplane Back to its Usual Condition.
TASK 31-41-00-705-193
5. Remote Dedicated Display Unit (RDDU) - Operational Test_______________________________________________________
A. References
(1) AMM 24-22-00/201, Manual Control (Apply Power)
B. Access
(1) Location Zones 118 Electrical and Electronics Compartment, RH 211 Main Deck, LH
C. Procedure
S 865-144
(1)
Supply electrical power (AMM 24-22-00/201).
S 865-113
(2)
Start WBC mode 01:
(a) Push the MODE key on the WBC.
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747-400 MAINTENANCE MANUAL
(b)
Push the 0 key and then the 1 key.
(c)
Push the ENTER key.
(d)
When OK? UNITS=LB shows, push the NO key.
(e)
When OK? UNITS=KG shows, push the YES key.
NOTE: The gross weight shows on the left side of the display.
____ The center of gravity shows on the right side.
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