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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 30-21-00
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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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 30-21-00
 ALL  ú ú 04 Page 509 ú Jun 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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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