(b)  
Push the MODE key on the WBC.

 (c)  
Use the keyboard to put in 22.

__

 (d)  
Push the ENTER key.

 (e)  
When OK shows, push the YES key.

 (f)  
Push the + key until the identification number of the replaced sensor shows (The table below shows the sensor identification numbers).

 ~................................................... | | LEFT | RIGHT | | | NOSE SENSORS | NOSE SENSORS | ..................................................... | FORWARD | 17F | 18F | ..................................................... | AFT | 17R | 18R | 2.............…..................…..................1 Nose Landing Gear Sensor Identification Numbers

 (g)  
Make a record of the value that shows on the right side of the display.

 (h)  
If the value is not between 21518 and 39518, do the Null Adjustment procedure.

 (i)  
Do above steps again for each replaced sensor.

 (j)  
Push the RESET key.

 (k)  
Push the MODE key.

 (l)  
Use the keyboard to put in 99.

__
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747-400 MAINTENANCE MANUAL
 (m)  
Push the ENTER key.

 (n)  
When OK shows, push the YES key.

 (o)  
When ENTER CAL CODE shows, push the decimal point (.) key, the 9 key, and the MODE key.

 (p)  
Push the ENTER key.

 (q)  
When OK shows, push the YES key.

 (r)  
When ENTER 99 CODE shows, put in 747.

___

 (s)  
Push the ENTER key.

 (t)  
When OK shows, push the YES key.

 (u)  
When EDIT ZERO? shows, push the YES key.

 (v)  
Push the + key until the identification number of the replaced sensor shows.

 (w)  
Use the keyboard to put in the value that you made a record of in mode 22.

 (x)  
Push the ENTER key.

 (y)  
When OK shows, push the YES key.

 (z)  
When DONE shows, push the NO key and do above steps again for

 each replaced sensor. (aa) When DONE shows and all sensors are adjusted, push the YES key. (ab) When EXIT MODE 99? shows, push the YES key.
 S 824-088
 (3)  Use mode 21 to make sure that the zero adjustment was satisfactorily completed:
 (a)  
Push the MODE key.

 (b)  
Use the keyboard to put in 21.

__

 (c)  
Push the ENTER key.

 (d)  
When OK shows, push the YES key.

 (e)  
Push the + key until the identification number of the replaced sensor shows.

 (f)  
Make sure that the data for the replaced sensor matches the data that you put in with mode 99.

 (g)  
Do above steps again for each replaced sensor.

 (h)  
Close the WBC keyboard cover.

 H. Null Adjustment
 NOTE:____The cam (9) is sensitive to adjustment. Turning it one degree changes the null by 160 mico-inches (WBC mode 22 count equals approximately 714).
 S 584-074
 (1)  Lift the nose landing gear fully off the ground on a jack
 (AMM 07-11-03/201).

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 S 014-075
 (2)  
Remove the hubcap from the wheel.

 S 824-077

 (3)  
Do the null adjustment:

 (a)  
Remove the nameplate from the top of the outboard ring of the in-axle mount assembly (1, Fig. 402).

 (b)  
Loosen the outboard mounting bolt (7).

 (c)  
Tighten the outboard mounting bolt (4) to 10 |5 pound-inches.

 (d)  
Push the MODE key.
　
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