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747-400 MAINTENANCE MANUAL
 S 975-064
 (3) Calculate the delta counts for Figures 504, 506, 508, and 510:
 (a)  For each main landing gear axle, subtract the AXLE ZERO (Figure 501) from the AXLE COUNTS, and write the results in the X (DELTA COUNTS) columns.
 NOTE: For the main landing gear:
____ X = DELTA COUNTS = AXLE COUNTS - AXLE ZERO
 (b)  For each nose landing gear sensor, subtract the ZERO (Figure 501) from the AVERAGE, and write the results in the column labeled X (DELTA COUNTS).
 NOTE: For the nose landing gear:
____ X = DELTA COUNTS = AVERAGE - ZERO
 O. Calculate Span Values (Figure 511)
 S 975-083
 (1) For the main landing gear, calculate the AXLE SPAN for each axle:
 (a)  
Refer to Figure 511 for the formula to calculate AXLE SPAN (m).

 (b)  
For each summation, calculate products from the X, Y, and V values in each pair of figures (505 and 506, 507 and 508, 509 and 510) and then add the three products.

 NOTE: Because the weighting values in Figure 503 are zero, you
____ will use only three pairs of figures for the main landing gear calculations.
 (c)  
For example, to calculate the summation of XYV, add these products: 1) XYV from Figures 505 and 506 2) XYV from Figures 507 and 508 3) XYV from Figures 509 and 510

 (d)  
Make sure that each AXLE SPAN value is between 12.5 and 15.5.

 NOTE: 12.5  AXLE SPAN  15.5
____
 S 975-084
 (2)  For the main landing gear, calculate the PRIMARY SPAN values for the odd numbered sensors:
 (a)  
Multiply the AXLE SPAN (m) by the value of k from Figure 511.

 (b)  
Write the results in the PRIMARY SPAN column of Figure 511.

 S 975-085
 (3)  For the main landing gear, calculate the SECONDARY SPAN values for the even numbered sensors:
 (a)  Multiply the AXLE SPAN (m) by 1 minus the value of k from Figure 511.
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747-400 MAINTENANCE MANUAL
AXLE SPAN (m)
AXLE  m =  2éVX éXYV  XVéYVé (éXV)2 ((éV)+ 1) ((éV)+ 1) -- SENSOR NO.  k  SENSOR SPAN mk PRIMARY  SECONDARY SENSOR SPAN m(1-k) 
L WING  1  0.64 
FWD  2  0.64 
L WING  3  0.64 
AFT  4  0.64 
L BODY  5  0.67 
FWD  6  0.67 
L BODY  7  0.67 
AFT  8  0.67 
R BODY  9  0.67 
FWD  10  0.67 
R BODY  11  0.67 
AFT  12  0.67 
R WING  13  0.64 
FWD  14  0.64 
R WING  15  0.64 
AFT  16  0.64 
MAIN LANDING GEAR 
SENSOR SPAN (m) 
SENSOR LOCATION  NO. SENSOR  m =  é 2VX éXYV  -- (éXV)2 V éV é XVéYVé 
LEFT FWD  17F 
LEFT AFT  17R 
RIGHT FWD  18F 
RIGHT AFT  18R 
NOSE LANDING GEAR 
Spans 
Figure 511 

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 (b)  Write the results in the SECONDARY SPAN column of Figure 511.
 S 975-086
 (4)  For the nose landing gear, calculate the SENSOR SPAN for each sensor:
 (a)  
Refer to Figure 511 for the formula to calculate SENSOR SPAN (m).

 (b)  
For each axle, calculate products from the X, Y, and V values in each pair of figures (503 and 504, 505 and 506, 507 and 508, 509 and 510) and then add the four products.

 (c)  
For example, to calculate the summation of XYV, add these products: 1) XYV from Figures 503 and 504 2) XYV from Figures 505 and 506 3) XYV from Figures 507 and 508 4) XYV from Figures 509 and 510
　
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