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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 ~......................................... | WINDOW | | WHCU | | RESISTANCE (OHMS) | TERMINAL | CONNECTOR| | (WINDOW UNDER | STRIP TAP| PIN | | 88°F |20°) | | | ........................................... | WINDOW NO. 1 | ........................................... | MIN | MAX | | | ........................................... | 31.4 | 35.1 | 1 | 7 | | 35.1 | 38.8 | 2 | 8 | | 38.8 | 42.6 | 3 | 14 | | 42.6 | 47.3 | 4 | 20 | | 47.3 | 52.0 | 5 | 21 | ..........…................................ | WINDOW NO. 2 | ........................................... | MIN | MAX | | | ........................................... | 55.7 | 62.3 | 1 | 1 | | 62.3 | 69.0 | 2 | 7 | | 69.0 | 75.5 | 3 | 8 | | 75.5 | 81.6 | 4 | 14 | | 81.6 | 90.3 | 5 | 20 | | 90.3 | 100 | 6 | 21 | 2.........….........…..........…..........1
 Window Resistance and Control Unit Connection Table 1
 (f)  Connect the wires to the heater on window No. 1.
 S 765-030
 (3)  
Do the same test again for the other No. 1 window and the two No. 2 windows.

 S 725-069

 (4)  
As an optional method the windows No.1 and No.2 can be measured at the Window Heat Control Unit connector.

 S 765-070

 (5)  
Remove the Window Heat Control Unit from the E3-3 rack.

 NOTE:____Window No.1 Left use WHCU connector D1044A ## Window Window No.1 Right use WHCU connector D1048A Window No.2 Left use WHCU connector D1046A Window No.2 Right use WHCU connector D1042A
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 30-41-21
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 S 765-073
 (6)  Do a check of the resistance of the heater circuit in the No.1 window.
 (a)  
Using Table 1 measure the resistance of the heater circuit Left No.1 window.

 (b)  
If the resistance check failed, then check the circuit from the WHCU to the applicable window. (WDM 30-41-11, 30-41-12)

 (c)  
If the circuit checks good then do a test of the electrical resistance of the applicable window.

 S 765-078
 (7)  
Do the same test again for the other No. 1 window and the two No. 2 windows.

 S 765-040

 (8)  
Do a test of the electrical resistance of window No. 4 and 5.

 NOTE: Do these steps for each window.
____
 (a)  
Disconnect the wires from the heater connections on the window.

 (b)  
Measure the resistance across the window.

 (c)  
Make sure the resistance is in these limits:

 (d)  
If the resistance check failed then replace the window.

 (AMM 56-11-31/401) ~.................................................. | WINDOW NO. 4 | Triplex | 41.3 - 55.8 OHMS | .................................................... | WINDOW NO. 4 | PPG | 61.6 - 83.4 OHMS | .................................................... | WINDOW NO. 5 | Triplex | 34.1 - 46.0 OHMS | .................................................... | WINDOW NO. 5 | PPG | 40.6 - 55.0 OHMS | 2................…...........….....................1

 (e)  
Connect the wires to the window heater.

 S 865-062
 (9)  Close these circuit breakers and remove the DO-NOT-CLOSE tags:
 (a)  On the P6 panel
 1) R FRONT WINDOW ANTI-ICE
 2) L FRONT WINDOW ANTI-ICE
 3) R SIDE WINDOW ANTI-ICE
 4) L SIDE WINDOW ANTI-ICE
 5) RIGHT NO. 4 AND NO. 5 WINDOW ANTI-ICE
 6) LEFT NO. 4 AND NO. 5 WINDOW ANTI-ICE

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