30-41-00
 ALL  ú ú 01 Page 503 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
Preconditions
 S 865-047
 (1)  These conditions are necessary for this task:
 (a)  
Electrical power on (AMM 24-22-00/201).

 (b)  
Integrated Display System (IDS) is serviceable

 (AMM 31-61-00/501).Prepare for Test
 S 865-011
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-014

 (2)
Set the GND TEST switch on the P461, panel to ENABLE.No. 1 Left Window Heat System Test

 NOTE: Do not do this test when the outside ambient temperature is above
____ 85° F (29° C).
 S 715-016
 (1)  Push the left WINDOW HEAT switch on the anti-ice/rain removal module (P5, panel) to ON.
 (a)  Make sure that the INOP light in the switch goes off.
 S 745-017
 (2)  Do a CMC ground test of the No. 1 left window heat system (AMM 30-41-00/501):
 (a)  
Select <GROUND TESTS from the CMC main menu.

 (b)  
Select <30 ICE AND RAIN from the ground tests menu.

 (c)  
Select <WINDOW HEAT-1L from the ice and rain menu. 1) Make sure that TEST IN PROGRESS shows on the CDU. 2) Make sure that the INOP light in the left WINDOW HEAT

 switch comes on in 12 seconds or less.
 3) Make sure that PASS shows on the CDU.

 (d)  
Push the left window heat switch to the off position. 1) Make sure that the INOP light in the switch comes on.

 S 745-018
 (3)  Make sure that there is indication for a shorted sensor:
 (a)  Open 6B34, WINDOW HEAT 1L circuit breaker on the P6, Main Power Distribution Panel and 180H26, WDO HEAT CONT 1L circuit breaker on the P180, DC Power Distribution Panel.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 30-41-00
 ALL  ú ú 01 Page 504 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 WARNING: DO NOT CONNECT JUMPER TO CONNECTORS D401, D403, D405, OR
_______ D419. THIS WILL CAUSE ELECTRICAL ARCS WHICH CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
 (b)  
Install a jumper between connectors D411 and D413 of the No. 1 left window.

 (c)  
Close 6B34, WINDOW HEAT 1L circuit breaker on the P6, Main Power Distribution Panel and 180H26, WDO HEAT CONT 1L circuit breaker on the P180, DC Power Distribution Panel.

 (d)  
Push the left WINDOW HEAT switch to the ON position.

 1)  Make sure that the INOP light in the switch comes on within 5 seconds.

 (e)  
Select EXISTING FAULTS, chapter 30 and check that FORWARD WINDOW HEAT SENSOR - L shows on the CDU.

 (f)  
Make sure that the EICAS advisory message HEAT WINDOW L shows.

 (g)  
Open 6B34, WINDOW HEAT 1L circuit breaker on the P6, Main Power Distribution Panel and 180H26, WDO HEAT CONT 1L circuit breaker on the P180, DC Power Distribution Panel.

 (h)  
Remove the jumper between connectors D411 and D413 of the left forward window.

 (i)  
Close 6B34, WINDOW HEAT 1L circuit breaker on the P6, Main Power Distribution Panel and 180H26, WDO HEAT CONT 1L circuit breaker on the P180, DC Distribution Panel.

 F.  No. 1 Right Window Heat System Test
 NOTE: Do not do this test when the outside ambient temperature is above
____
 85° F (29° C).

 S 715-022
 (1)  Push the right WINDOW HEAT switch on the anti-ice/rain removal module (P5, panel) to ON.
 (a) Make sure that the INOP light in the switch goes off.
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