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 31-41-00
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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.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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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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