S 865-070
 (9)  
Apply 39 to 41 PSIG air pressure to the switch with an external compressed air source.

 S 715-084

 (10)
 Make sure that the applicable EICAS status message ANTI ICE NAC 1, 2, 3, or 4 shows.

 NOTE: 70 seconds are necessary for this message to show.
____
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A
747-400 MAINTENANCE MANUAL
 S 865-060
 (11)
 Decrease the air pressure to 0.

 S 865-092

 (12)
 Set the engine 1, 2, 3, and 4 fuel control switches on the P8, panel to the CUTOFF position.

 S 865-091

 (13)
 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

 (c)
6J12, NACELLE ANTI ICE 3

 (d)
6J13, NACELLE ANTI ICE 4

 S 035-061
 (14)
 Remove the electrical connector from the nose cowl pressure switch.

 S 425-062

 (15)
 Install the nose cowl pressure switch (AMM 30-21-04/401).

 S 865-068

 (16)
 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

 (c)
6J12, NACELLE ANTI ICE 3

 (d)
6J13, NACELLE ANTI ICE 4

 S 415-102
 (17)
 AIRPLANES WITH ACCESS DOOR ON THE FORWARD FAIRING;
 Close the TAI access door.

 S 405-103

 (18)
 AIRPLANES WITHOUT ACCESS DOOR ON THE FORWARD FAIRING; Install No. 2 and No. 3 forward fairings (AMM 54-62-04/401).

 (19)
 Remove electrical power (AMM 24-22-00/201).

 S 865-064
 TASK 30-21-00-735-008
 4.  System Test - Engine Inlet Anti-Ice System__________________________________________
 A. Standard Tools and Equipment
 (1) Source of compressed air, 0-50 psig
 B. References
 (1)
AMM 24-22-00/201, Manual Control

 (2)
AMM 30-21-04/401, Nose Cowl Pressure Switch

 (3)
AMM 30-81-00/501, Ice Detection System

 (4)
AMM 31-61-00/201, Integrated Display System

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 C.
D.
E.
A
747-400 MAINTENANCE MANUAL
 (5)  
AMM 54-62-04/401, Forward Fairing - Removal/Installation

 (6)  
AMM 71-11-04/201, Fan Cowl

 (7)  
AIPC 30-21-03, Fig. 1

 (8)  
SSM 30-21-01, SSM 30-21-02, SSM 30-21-03, SSM 30-21-04

 (9)
WDM 30-21-11, WDM 30-21-21, WDM 30-21-31, WDM 30-21-41Access

 (1)  
AIRPLANES WITH ACCESS DOOR ON THE FORWARD FAIRING;

 Location Zone 451 Engine 1 - Strut Forward Fairing, No. 3 Fairing 461 Engine 2 - Strut Forward Fairing, No. 3 Fairing 471 Engine 3 - Strut Forward Fairing, No. 3 Fairing 481 Engine 4 - Strut Forward Fairing, No. 3 Fairing

 (2)  
AIRPLANES WITHOUT ACCESS DOOR ON THE FORWARD FAIRING; Location Zone 451 Engine 1 - Strut Forward Fairing, No. 2 and No. 3 Fairings 461 Engine 2 - Strut Forward Fairing, No. 2 and No. 3 Fairings 471 Engine 3 - Strut Forward Fairing, No. 2 and No. 3 Fairings

 481  Engine 4 - Strut Forward Fairing, No. 2 and No. 3 Fairings
Preconditions
 S 865-088
 (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 the Test
 S 865-009
 (1)  
Supply electrical power (AMM 24-22-00/201).
　
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