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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