S 865-010

 (2)  
Set these switches on the P5, panel to the off position:

 NACELLE ANTI-ICE 1 ENGINE START VALVE 1 NACELLE ANTI-ICE 2 ENGINE START VALVE 2 NACELLE ANTI-ICE 3 ENGINE START VALVE 3 NACELLE ANTI-ICE 4 ENGINE START VALVE 4 AIR CONDITIONING PACK 1 ENGINE BLEED VALVE 1 AIR CONDITIONING PACK 2 ENGINE BLEED VALVE 2 AIR CONDITIONING PACK 3 ENGINE BLEED VALVE 3 APU VALVE ENGINE BLEED VALVE 4 LEFT ISOLATION VALVE RIGHT ISOLATION VALVE
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747-400 MAINTENANCE MANUAL
 S 865-069
 WARNING: MAKE SURE TO OPEN ENGINE IGNITION CIRCUIT BREAKERS BEFORE YOU
_______ SET THE FUEL CONTROL SWITCH TO RUN. IF YOU DO NOT OPEN THE CIRCUIT BREAKERS, THE IGNITER PLUGS CAN AUTOMATICALLY FIRE. WITH UNBURNED FUEL IN THE COMBUSTION CHAMBER, THERE MAY BE AN INTERNAL ENGINE FIRE OR A TAILPIPE FIRE. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO THE ENGINE.
 (3)  Open these circuit breakers on the P6, Main Power Distribution Panel:
 (a)  
6F1, IGN 1 ENG 1

 (b)  
6K19, IGN 2 ENG 1

 (c)  
6G19, STBY IGN ENG 1

 S 865-055
 (4)  
Set the engine 1, 2, 3, and 4 fuel control switches on the P8, panel to the RUN position.

 S 865-011

 (5)  
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 015-104
 (6)  
AIRPLANES WITH ACCESS DOOR ON THE FORWARD FAIRING; Open the TAI access door on the left side of the No. 3 forward fairing.

 S 045-105

 (7)  
AIRPLANES WITHOUT ACCESS DOOR ON THE FORWARD FAIRING;
 Remove No. 2 and No. 3 forward fairings (AMM 54-62-04/401).

 F. System Operation and Indication Test
 S 035-012
 (1)  Disconnect the electrical connector from the applicable TAI valve: ~................................ | Engine 1 | Connector DV88 | .................................. | Engine 2 | Connector DV159 | .................................. | Engine 3 | Connector DV160 | .................................. | Engine 4 | Connector DV161 | 2............…...................1
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747-400 MAINTENANCE MANUAL
 S 865-013
 (2)  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 715-014
 (3)  
Set the applicable NACELLE ANTI-ICE switch on the anti-ice/rain removal module (P5, panel) to the ON position.

 S 765-015

 (4)  
Measure the voltage between pin 1 (+) and pin 2 (gnd) of the TAI valve electrical connector.

 NOTE: There will not be voltage at the TAI valve electrical
____ connector until 2 seconds after the switch is turned on.
 (a)  Make sure that the voltage is is 28 |3 volts dc.
 S 865-016
 (5)  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 765-017
 (6)  Make sure that the voltage between pins 1 and 2 of the TAI valve electrical connector is 0 |3 volts dc.
 G. Valve Position Disagreement Test
 S 715-020
 (1)  
Make sure that the applicable EICAS advisory message NAI VALVE ENG 1, 2, 3, or 4 shows.
　
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