S 715-005
 (4)  Make sure that the anti-ice valves close:
 (a)  
Set the NACELLE ANTI-ICE 1, 2, 3, and 4 switches to the off position.

 (b)  
Make sure that NAI no longer shows.

 S 865-006
 (5)  
Remove pneumatic power (AMM 36-00-00/201).

 S 865-007

 (6)  
Remove electrical power (AMM 24-22-00/201).

 TASK 30-21-00-735-065
 3.  Duct Overpressure Indication Test_________________________________
 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

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (3)  AMM 54-62-04/401, Forward Fairing - Removal/Installation
 C. Access
 (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
 D. Preconditions
 S 865-087
 (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).

 E. Procedure
 S 865-078
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-080

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

 S 865-082

 (3)  
Open this circuit breaker on the P6, Main Power Distribution Panel for the applicable engine:

 (a)  6J10, NACELLE ANTI ICE 1
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 (b)  
6J11, NACELLE ANTI ICE 2

 (c)  
6J12, NACELLE ANTI ICE 3

 (d)  
6J13, NACELLE ANTI ICE 4

 S 015-100
 (4)  
AIRPLANES WITH ACCESS DOOR ON THE FORWARD FAIRING; Open the TAI access door on the left side of the No. 3 forward fairing.

 S 045-101

 (5)  
AIRPLANES WITHOUT ACCESS DOOR ON THE FORWARD FAIRING; Remove No. 2 and No. 3 forward fairings (AMM 54-62-04/401).

 S 025-056

 (6)  
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 435-057
 (7)  
Connect the electrical connector to the nose cowl pressure switch again.

 S 865-090

 (8)  
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
　
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