(d)
Make sure that the largest SENSOR SPAN value is less than 10.5.
NOTE: Maximum NLG SENSOR SPAN < 10.5
____
S 975-087
(5) For the nose landing gear, calculate the span ratio for each nose wheel:
(a)
For each nose wheel, divide the SENSOR SPAN value of the AFT sensor by the SENSOR SPAN value of the FORWARD sensor.
(b)
Make sure that each span ratio is between 1.25 and 1.75.
NOTE: 1.25 (AFT SENSOR SPAN) / (FWD SENSOR SPAN) 1.75
____
P. Calculate Offset Values (Figure 512)
S 975-149
(1) For the main landing gear, calculate the AXLE OFFSET value for each axle:
(a) Refer to Figure 512 for the formula to calculate AXLE OFFSET (b).
S 975-136
(2) For the main landing gear, calculate the SENSOR OFFSET values:
(a) Refer to Figure 512 for the formulas to calculate SENSOR OFFSET.
NOTE: The formula for the sensors on the aft axles of the wing
____ landing gear is different than the formula for the other sensors.
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MAINTENANCE MANUAL
AXLE -YV AXLE OFFSET (b) V+1 b = é méXV é NO. SENSOR GEAR SENSOR OFFSET 450b -2 AFT WING LANDING 2 b OTHER MAIN LANDING GEAR SENSOR OFFSET
FWD L WING 2 1
AFT L WING 3 4
FWD L BODY 5 6
AFT L BODY 7 8
FWD R BODY 10 9
R BODY AFT 12 11
FWD R WING 14 13
AFT R WING 16 15
MAIN LANDING GEAR
SENSOR LOCATION NO. SENSOR SENSb = V+1 -OR OFFSET (b) éYV méXV é
LEFT FWD 17F
LEFT AFT 17R
RIGHT FWD 18F
RIGHT AFT 18R
NOSE LANDING GEAR
Offsets
Figure 512
C22254
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(b) Make sure that each SENSOR OFFSET value is not more than 1000 lbs.
NOTE: MLG SENSOR OFFSET 1000 lbs.
____
S 975-090
(3) For the nose landing gear, calculate the SENSOR OFFSET value for each sensor:
(a)
Refer to Figure 512 for the formulas to calculate SENSOR OFFSET.
(b)
Make sure that each SENSOR OFFSET value is not more than 2000 lbs.
NOTE: NLG SENSOR OFFSET 2000 lbs.
____
Q. Record Load Sensor Resistance (Mode-23) (Figure 513)
S 975-065
(1) Read the resistance of each load sensor with WBC mode 23 and write the data in Figure 513:
(a)
Push the MODE key.
(b)
Push the 2 key and then the 3 key.
(c)
Push the ENTER key.
(d)
When OK? shows, push the YES key.
(e)
When RES 1 shows, read the sign and number that show to the right of RES 1 and write them in Figure 513.
(f)
Push the + key to get the resistance values for the other sensors (RES 2, RES 3, RES 4...).
(g)
Push the RESET key to stop this mode. (The WBC shows PROCESS ABORTED.)
R. Put Calibration Data into Calibration Module
S 975-016
(1) Use WBC mode-99 to put the load sensor spans, offsets, and resistances from Figures 511, 512, and 513 into the calibration module:
(a)
Put the WBC into Mode-99 operation: 1) Open the keyboard cover, and push the MODE key. Display shows ( ) (MODE= ) 2) Push 99 (the 9 key two times). Display shows ( ) (MODE= 99) 3) Push the ENTER key. Display shows (OK? ) (MODE= 99)
4) When the proper mode shows, push the YES key. Display shows (ENTR CAL) (CODE ) 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 指示/记录系统 1(97)
