(f)
Push the + key to get the calibration resistance values for the other sensors.
(g)
Push the RESET key to stop this mode. (The WBC shows PROCESS ABORTED.)
S 975-128
(4) Read the pitch attitude sensor (PAS) zero with WBC mode-27 and write the data in Figure 526:
(a)
Push the MODE key.
(b)
Push the 2 key and then the 7 key.
(c)
Push the ENTER key.
(d)
When OK? shows, push the YES key.
(e)
When ZERO PAS shows, read the sign and number that show to the right of ZERO PAS and record them in Figure 526.
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MAINTENANCE MANUAL
Record of Calibration Data
Figure 526
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F27037
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747-400 MAINTENANCE MANUAL
(f) Push the RESET key to stop this mode. (The WBC shows PROCESS ABORTED.)
Q. Put the Airplane Back to Its Usual Condition
S 865-063
(1)
Make sure that the shock struts of the wing, body, and nose landing gears are at normal inflation pressures (AMM 12-15-03/301, AMM 12-15-04/301, AMM 12-15-05/301).
S 865-064
(2)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
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747-400 MAINTENANCE MANUAL
WEIGHT AND BALANCE COMPUTER - REMOVAL/INSTALLATION
__________________________________________________
1. General_______
A. There are two tasks in this procedure. The first task is the removal of the weight and balance computer (WBC). The second task is the installation of the WBC. The installation task contains steps to put an airplane identification number into the WBC.
B. The WBC, B7110, is in the main equipment center on rack E2, shelf 4.
C. The non-volatile memory (NVM) of the WBC must contain an airplane identification number to operate. The identification number is the airplane registration number. (The airplane registration number, also referred to as the tail identification or tail sign (T/S), comes from the MAWEA, through the EIU, to the WBC. The number is identified on the WBC display as EIU T/S.)
D. The calibration module (CM) also contains the airplane registration number. When you install a new WBC, you let the WBC automatically get the airplane registration number from the CM.
TASK 31-41-01-004-001
2. Weight and Balance Computer Removal___________________________________
A. References
(1)
AMM 20-11-22/401, E/E Rack Mounted Components
(2)
AMM 20-41-01/201, Static Grounding Procedure
B. Access
(1) Location Zone 118 Electrical and Electronics Compartment, Right
C. Weight and Balance Computer Removal
S 864-020
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P414 Power Distribution Center - Left 1) 414K20 WT & BAL
(b)
P415 Power Distribution Center - Right 1) 415G21 WBS CHB ALT
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