(b)
Push the 2 key and then the 4 key.
(c)
Push the ENTER key.
(d)
When OK? shows, push the YES key.
(e)
When SPAN 1 shows, read the sign and number that show to the right of SPAN 1 and record them in Figure 515.
(f)
Push the + key to get the span values for the other sensors (SPAN 2, SPAN 3, SPAN 4...).
(g)
Push the RESET key to stop this mode. (The WBC shows PROCESS ABORTED.)
S 975-138
(2) Read the load sensor offset values with WBC mode-25 and write the data in Figure 515:
(a) Push the MODE key.
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747-400
MAINTENANCE MANUAL
LOAD
LOAD SENSOR
LOAD SENSOR
LOAD SENSOR
SENSOR
SPAN
OFFSET
RESISTANCE
NUMBER
(MODE 24)
(MODE 25)
(MODE 26)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17F
17R
18F
18R
PITCH ATTITUDE SENSOR (PAS) ZERO (MODE 27)
Record of Calibration Data
Figure 515
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747-400 MAINTENANCE MANUAL
(b)
Push the 2 key and then the 5 key.
(c)
Push the ENTER key.
(d)
When OK? shows, push the YES key.
(e)
When OFF 1 shows, read the sign and number that show to the right of OFF 1 and record them in Figure 515.
(f)
Push the + key to get the offset values for the other sensors (OFF 2, OFF 3, OFF 4...).
(g)
Push the RESET key to stop this mode. (The WBC shows PROCESS ABORTED.)
S 975-140
(3) Read the load sensor calibration resistances with WBC mode-26 and write the data in Figure 515:
(a)
Push the MODE key.
(b)
Push the 2 key and then the 6 key.
(c)
Push the ENTER key.
(d)
When OK? shows, push the YES key.
(e)
When CRES 1 shows, read the sign and number that show to the right of CRES 1 and record them in Figure 515.
(f)
Push the + key to get the calibration resistance values for the other sensors (CRES 2, CRES 3, CRES 4...).
(g)
Push the RESET key to stop this mode. (The WBC shows PROCESS ABORTED.)
S 975-080
(4) Read the pitch attitude sensor (PAS) zero with WBC mode-27 and write the data in Figure 515:
(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 515.
(f)
Push the RESET key to stop this mode. (The WBC shows PROCESS ABORTED.)
U. Put the Airplane Back to its Usual Condition
S 865-080
(1)
Make sure that the tires and shock struts of the wing, body, and nose landing gear are at normal inflation pressures (AMM 12-15-03/301, AMM 12-15-04/301, AMM 12-15-05/301).
(2)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
S 865-142
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