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

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

 (o)  
Push the ENTER key.

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

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

___

 (r)  
Push the ENTER key.

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

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 (t)  
When EDIT ZERO? shows, push the YES key.

 (u)  
Push the right or left arrow key until the identification number of the replaced sensor shows (Table 1 shows the sensor identification numbers).

 (v)  
Use the keyboard to put in the value that you made a record of in step (g).

 (w)  
Push the ENTER key.

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

 (y)  
When DONE shows, push the NO key and do steps (u) thru (x) again for each replaced sensor.

 (z)
When DONE shows and all sensors are adjusted, push the YES key. (aa) When EXIT MODE 99? shows, push the YES key.

 S 744-122
 (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 right or left arrow key until the identification number of the replaced sensor shows (Table 1 shows the sensor identification numbers).

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

 (g)  
Do steps (e) and (f) again for each replaced sensor.

 (h)  
Close the WBC keyboard cover.

 S 584-123
 (4)  
Lower the airplane (AMM 07-11-01/201).

 S 864-145

 (5)  
Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

 TASK 31-41-05-824-190
 4.  Main Landing Gear Mounting Lug Shims____________________________________
 A. General
 (1)  Shims are installed on the mounting lugs for the load sensors. The shims set the mounting surfaces parallel to each other (| 0.005 inch).
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747-400
MAINTENANCE MANUAL

 (2)  
The shims are installed initially and are not usually replaced. Adhesive attaches the shims.

 (3)  
During the overhaul of the main landing gear, the shims can be removed. New beams for the landing gear possibly will not have shims installed.

 (4)  
It is necessary to lift the airplane on jacks when you install the shims. The digital voltage count of the WBC mode 22 is used to find the necessary shims. The permitted digital voltage count is 26467 to 37717.

 (5)  
Shims are available in two dimensions. A 0.002-inch thick shim (Boeing P/N 284U4049-55) will change the digital voltage count by approximately 9000 counts. A 0.003-inch thick shim (Boeing P/N 284U4049-49) will change the digital voltage count by approximately 13,500 counts. No more than two shims are permitted at each mounting lug pair.

 B. Equipment
 (1)  
4065575-901 - Alignment Clamp, Top Load Sensor, Honeywell Inc., Phoenix, Arizona

 (2)  
4065572-901 - Alignment Clamp, Bottom Load Sensor, Honeywell Inc., Phoenix, Arizona (dual WBS only)

 C. Consumable Materials
 (1)  
A00779 Adhesive, BMS 5-26

 (2)  
B00184 Solvent, BMS 11-7

 (3)  
E00002 Stripper, Paint, TURCO 5351

 D. Parts
　
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