S 865-019
(2)
Close this circuit breaker on the P6, Main Power Distribution Panel for the applicable engine:
(a) 6J10, NACELLE ANTI ICE 1
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A
747-400 MAINTENANCE MANUAL
(b)
6J11, NACELLE ANTI ICE 2
(c)
6J12, NACELLE ANTI ICE 3
(d)
6J13, NACELLE ANTI ICE 4
S 715-018
(3)
Make sure that the applicable EICAS advisory message NAI VALVE ENG 1, 2, 3, or 4 shows.
S 485-020
(4)
Connect an electrical ground to pin 5 of the TAI valve electrical connector.
S 715-021
(5)
Make sure that the applicable EICAS message NAI VALVE ENG 1, 2, 3, or 4 does not show.
S 085-022
(6)
Remove the ground from pin 5 of the TAI valve electrical connector.
S 865-071
(7)
Set the applicable NACELLE ANTI-ICE switch to the OFF position.
S 765-024
(8)
Measure the voltage between pin 1 (+) and pin 2 (gnd) of TAI valve electrical connector.
(a) Make sure that the voltage is 0 |3 volts dc.
S 485-073
(9)
Connect an electrical ground to pin 3 of the TAI valve electrical connector.
S 715-075
(10)
Make sure that the applicable EICAS advisory message NAI VALVE ENG 1, 2, 3, or 4 does not show.
S 715-027
(11)
Make sure that NAI does not show to the left of the applicable engine N1 indicator.
(12)
Remove the ground from pin 3 of the TAI valve electrical connector.
S 715-029
(13)
Make sure that the applicable EICAS advisory message NAI VALVE ENG 1, 2, 3, or 4 shows.
S 865-030
(14)
Open this circuit breaker on the P6, Main Power Distribution Panel for the applicable engine:
(a)
6J10, NACELLE ANTI ICE 1
(b)
6J11, NACELLE ANTI ICE 2
S 085-028
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A
747-400 MAINTENANCE MANUAL
(c)
6J12, NACELLE ANTI ICE 3
(d)
6J13, NACELLE ANTI ICE 4
H. Duct Overpressure Indication Test
S 025-029
(1) Remove the applicable nose cowl pressure switch
(AMM 30-21-04/401):
~..............................
| Engine 1 | Switch S789 |
................................
| Engine 2 | Switch S790 |
................................
| Engine 3 | Switch S791 |
................................
| Engine 4 | Switch S792 |
2............….................1
S 435-030
(2)
Connect the electrical connector to the nose cowl pressure switch again.
S 865-031
(3)
Apply 39 to 41 PSIG air pressure to the switch with an external compressed air source.
S 715-032
(4)
Make sure that the applicable EICAS status message ANTI ICE NAC 1, 2, 3, or 4 shows.
NOTE: AIRPLANES WITH GE OR PW ENGINES;
____ 70 seconds are necessary for this message to show.
S 845-033
(5)
Decrease the air pressure to 0.
(6)
Remove the electrical connector from the nose cowl pressure switch.
S 425-035
(7)
Install the nose cowl pressure switch (AMM 30-21-04/401).
S 035-034
I. Engine Cowl Overheat Switch Test
S 865-036
(1) Close this circuit breaker on the P6, Main Power Distribution Panel for the applicable engine:
(a)
6J10, NACELLE ANTI ICE 1
(b)
6J11, NACELLE ANTI ICE 2
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本文链接地址：747-400 AMM 飞机维护手册 防冰和排雨 ICE AND RAIN PROTECTION(20)
