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747-400 MAINTENANCE MANUAL
S 745-023
(2) Do a CMC ground test of the No. 1 right 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-1R 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 right WINDOW HEAT
switch comes on in 12 seconds or less. 3) Make sure that PASS shows on the CDU for the right window heat control unit.
(d)
Push the right window heat switch to the off position. 1) Make sure that the INOP light in the switch comes on.
S 745-024
(3) Make sure that there indication of a shorted sensor:
(a) Open 6B17, WINDOW HEAT 1R circuit breaker on the P6, Main Power Distribution Panel and 180H12, WDO HEAT CONT 1R circuit breaker on the P180, DC Power Distribution Panel.
WARNING: DO NOT CONNECT JUMPER TO CONNECTORS D400, D402, D404, OR
_______ D418. THIS WILL CAUSE ELECTRICAL ARCS WHICH CAN CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
(b)
Install a jumper between connectors D410 and D412 of the No. 1 right window.
(c)
Close 6B17, WINDOW HEAT 1R circuit breaker on the P6, Main Power Distribution Panel and 180H12, WDO HEAT CONT 1R circuit breaker on the P180, DC Power Distribution Panel.
(d)
Push the right 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 make sure that FORWARD WINDOW HEAT SENSOR - R shows on the CDU.
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747-400 MAINTENANCE MANUAL
(f)
Make sure that the EICAS advisory message HEAT WINDOW R shows.
(g)
Open 6B17, WINDOW HEAT 1R circuit breaker on the P6, Main Power Distribution Panel and 180H12, WDO HEAT CONT 1R circuit breaker on the P180, DC Power Distribution Panel.
(h)
Remove the jumper between connectors D410 and D412 of the right forward window.
(i)
Close 6B17, WINDOW HEAT 1R circuit breaker on the P6, Main Power Distribution Panel and 180H12, WDO HEAT CONT 1R circuit breaker on the P180, DC Power Distribution Panel.
S 865-043
(4) Set the GND TEST switch on the P461, panel to NORM.
G. No. 2L and No. 3R Window Heat System Test
NOTE: Do not do this test when the outside ambient temperature is above
____ 86° F (30° C). If the EICAS message or CMCS input monitoring bit does not show, the window may be at its operation temperature. If this occurs, let the window become cool. To do this, open 6E28 WINDOW HEAT 2L&3R PWR circuit breaker or apply freeze spray to the control thermostat until it closes. Do not apply freeze spray to the overheat thermostat.
S 715-035
(1) Do a test of the No. 2L window heat circuit:
(a)
Open 6E28, WINDOW HEAT 2L&3R PWR and 6E29, WINDOW HEAT 2L&3R IND circuit breakers on the P6, Main Power Distribution Panel. 1) Make sure that the EICAS status message WINDOW HEAT 2L
shows.
(b)
Remove the relay R7568 from the P415, Right Power Distribution Center.
(c)
Install a jumper between pins A1 and A2 of DR7568.
1) Make sure that the EICAS ststus message WINDOW HEAT 2L does not show.
(d)
Close 6E28, WINDOW HEAT 2L&3R PWR circuit breaker on the P6, Main Power Distribution Panel. 1) Make sure that the EICAS status message WINDOW HEAT 2L
shows.
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