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 NOTE: In the steps that follow, you will collect scales data for
____ Figure 517 and WBC data for Figure 518. The instructions tell you to take three sets of samples. Although it is not mandatory to collect three sets of samples, it is recommended because three samples give more accurate results.
 S 865-086
 (1)  
Make sure that persons inside the airplane do not move around when you read the scales or the WBC display.

 S 585-065

 (2)  
Lower the nose gear onto the scales.

 S 975-148

 (3)  
A minimum of 10 minutes after the airplane was moved onto the scales, collect the first set of samples:

 NOTE: The time delay is necessary to let the struts, the weight and
____ balance system (WBS) and the scales become stable.
 (a)  Read the weight on each nose wheel from the scales and write the data in Figure 517, in the WHEEL WEIGHT, SAMPLE 1 column.
 NOTE: Wheel weights must be recorded in pounds (lbs.).
____
 (b)  Read the counts for each load sensor (on the nose landing gear) with WBC mode 22 and write the data in Figure 518, in the SENSOR COUNTS, SAMPLE 1 column.
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SENSOR  ZERO 
NO.  (MODE 22) 
17F 
17R 
18F 
18R 

NOSE LANDING GEAR

Zeros
Figure 516

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F27021
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MAINTENANCE MANUAL

NOSE LANDING GEAR

Nose Wheel Weights at Normal Strut Pressures
Figure 517

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F27023
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MAINTENANCE MANUAL

 

Nose Sensor Counts at Normal Strut Pressures
Figure 518

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F27025
A 747-400 MAINTENANCE MANUAL
 (4)  S 865-090Stop for a minimum of one minute.
 (5)  S 975-034Collect the second set of samples: (a) Read the weight on each nose wheel from the scales and write the data in Figure 517, in the WHEEL WEIGHT, SAMPLE 2 column. (b) Read the counts for each load sensor (on the nose landing gear) with WBC mode 22 and write the data in Figure 518, in the SENSOR COUNTS, SAMPLE 2 column.
 (6)  S 865-035Stop for a minimum of one minute.
 (7)  S 975-036Collect the third set of samples: (a) Read the weight on each nose wheel from the scales and write the data in Figure 517, in the WHEEL WEIGHT, SAMPLE 3 column. (b) Read the counts for each load sensor (on the nose landing gear) with WBC mode 22 and write the data in Figure 518, in the SENSOR COUNTS, SAMPLE 3 column.

 H. Adjust Wing Gear Strut Pressure and Collect Data (Figures 519 and 520)
 NOTE: In the steps that follow, you will adjust the shock strut
____ pressures of the wing landing gear. Then you will collect scales data for Figure 519 and WBC data for Figure 520.
 S 865-044
 (1)  Adjust the inflation pressure of the wing landing gear shock struts equally until the total weight on the nose wheels is at least 20,000 lbs greater than the total weight in Figure 517, but it is not greater than 60,000 lbs total weight.
　
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