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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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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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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