(f)
Remove the jumper from pins A1 and A2 of DR7568.
S 715-037
(2) Do a test of the No. 3R window heat circuit:
(a)
Put C/26/002/11 into the CMCS INPUT MONITORING screen and make sure that bit 20 is a 1.
(b)
Install a jumper between pins B1 and B2 of DR7568.
1) Put C/26/002/11 into the CMCS INPUT MONITORING screen and make sure that bit 20 is a 0.
(c)
Close 6E28, WINDOW HEAT 2L&3R PWR circuit breaker on the P6, Main Power Distribution Panel. 1) Put C/26/002/11 into the CMCS INPUT MONITORING screen and
Make sure that bit 20 is a 1.
(d)
Open 6E28, WINDOW HEAT 2L&3R PWR circuit breaker on the P6, Main Power Distribution Panel.
(e)
Remove the jumper from pins B1 and B2 of DR7568.
(f)
Install the relay R7568 in the P415, Right Power Distribution Center.
S 715-038
(3) Do a test of the 2L&3R power off relay:
(a)
Close 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 does
not show. 2) Put C/26/002/11 into the CMCS INPUT MONITORING screen and Make sure that bit 20 is a 0.
(b)
Open 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. 2) Put C/26/002/11 into the CMCS INPUT MONITORING screen and make sure that bit 20 is a 1.
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747-400 MAINTENANCE MANUAL
(c)
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 does
not show. 2) Put C/26/002/11 into the CMCS INPUT MONITORING screen and make sure that bit 20 is a 0.
(d)
Open 6E29, WINDOW HEAT 2L&3R IND circuit breaker on the P6, Main Power Distribution Panel. 1) Make sure that the EICAS status message WINDOW HEAT 2L
shows.
NOTE: A delay of about 60 seconds can occur before the
____
message shows.
2) Put C/26/002/11 into the CMCS INPUT MONITORING screen and make sure that bit 20 is a 1.
(e) Close 6E29, WINDOW HEAT 2L&3R IND circuit breaker on the P6, Main Power Distribution Panel. 1) Make sure that the EICAS status message WINDOW HEAT 2L does
not show. 2) Put C/26/002/11 into the CMCS INPUT MONITORING screen and make sure that bit 20 is a 0.
H. No. 2R and No. 3L 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 6E30 WINDOW HEAT 2R&3L PWR circuit breaker or apply freeze spray to the control thermostat until it closes. Do not apply freeze spray to the overheat thermostat.
S 715-036
(1) Do a test of the No. 2R window heat circuit:
(a)
Open 6E30, WINDOW HEAT 2R&3L PWR and 6E31, WINDOW HEAT 2R&3L IND circuit breakers on the P6, Main Power Distribution Panel. 1) Make sure that the EICAS status message WINDOW HEAT 2R
shows.
(b)
Remove the relay R7569 from the P414, Left Power Distribution Center.
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747-400 MAINTENANCE MANUAL
(c)
Install a jumper between terminals B1 and B2 of DR7569.
1) Make sure that the EICAS status message WINDOW HEAT 2R does not show. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 防冰和排雨 ICE AND RAIN PROTECTION(52)
