S 864-036
 CAUTION: DO NOT TOUCH THE WBC BEFORE YOU DO THE STATIC GROUNDING
_______ PROCEDURE. ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE WBC.
 (2)  
Do the static grounding procedure (AMM 20-41-01/201).

 S 024-003

 (3)
Remove the weight and balance computer (AMM 20-11-22/401).

 TASK 31-41-01-404-004
 3. Weight and Balance Computer Installation
________________________________________
 A. References
 (1)  
AIPC 31-41-01, Fig. 1

 (2)  
AMM 20-11-22/401, E/E Rack Mounted Components

 (3)  
AMM 20-41-01/201, Static Grounding Procedure

 (4)  
AMM 24-22-00/201, Manual Control (Apply Power)

 B. Access
 (1)  Location Zone 118 Electrical and Electronics Compartment, Right
 C. Weight and Balance Computer Installation
 S 864-044
 (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 864-045
 CAUTION: DO NOT TOUCH THE WBC BEFORE YOU DO THE STATIC GROUNDING
_______ PROCEDURE. ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE WBC.
 (2)  
Do the static grounding procedure (AMM 20-41-01/201).

 (3)
Install the weight and balance computer (AMM 20-11-22/401).

 S 424-005
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 ALL  ú ú 14 Page 402 ú Feb 15/98
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747-400 MAINTENANCE MANUAL
 S 864-050
 (4) Remove the DO-NOT-CLOSE tags and close these circuit breakers:
 (a)  
P414 Power Distribution Center - Left
 1) 414K20 WT & BAL

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

 S 864-061
 (5)  
Supply electrical power (Ref 24-22-00/201).

 S 864-059

 (6)  
Use WBC mode 41 to put the airplane registration number into the WBC:

 (a)  
Open the keyboard cover.

 (b)  
Push the MODE key.

 (c)  
Push the 4 key and then the 1 key.

 (d)  
Push the ENTER key.

 (e)  
When OK? shows, push the YES Key. (The WBC automatically gets the airplane registration number from the calibration module.)

 (f)  
Close the keyboard cover.

 (g)  
When PUSH TEST SW shows, do the Weight and Balance Computer Installation Test below.

 D. Weight and Balance Computer Installation Test
 S 744-054
 (1)  Push the TEST switch on the front panel of the WBC.
 (a)  Make sure that the WBC shows these test displays:
 NOTE: Each test display shows for approximately 10 seconds.
____ Then the WBC shows TEST IN PROGRESS for approximately 20 seconds.
 1) ++++++++ ++++++++
 2) XXXXXXXX XXXXXXXX
 3) OOOOOOOO OOOOOOOO
 4) ........ ........

 (b)  Make sure that the WBC shows NO FAULTS.
 NOTE: The NO FAULTS display goes out of view after
____
 approximately 8 seconds.

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747-400 MAINTENANCE MANUAL
 S 864-005
 (2)  Remove the electrical power if it is not necessary (AMM 24-22-00/201).
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 31-41-01
　
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