(c)  
6J12, NACELLE ANTI ICE 3

 (d)  
6J13, NACELLE ANTI ICE 4

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747-400 MAINTENANCE MANUAL
 (2)  S 015-037Open the fan cowl panels for the applicable engine (AMM 71-11-04/201).
 (3)  S 035-038Disconnect the applicable electrical connector from the engine cowl overheat switch located on the fan cowl support beam: ~................................. | Engine 1 | Connector DS1626 | ................................... | Engine 2 | Connector DS1627 | ................................... | Engine 3 | Connector DS1628 | ................................... | Engine 4 | Connector DS1629 | 2............…....................1
 (4)  S 865-039Set the applicable NACELLE ANTI ICE switch to the ON position.
 (5)  S 485-040Connector a jumper from pin 1 to pin 3 on the engine cowl overheat switch electrical connector.
 (6)  S 715-041Make sure that the applicable EICAS status message NAI DUCT 1, 2, 3, or 4 LEAK shows.
 (7)  S 765-042Make sure that the voltage between pin 1 (+) and pin 2 (gnd) of the TAI valve electrical connector is 0 |3 volts dc.
 (8)  S 085-043Disconnect the jumper between pins 1 and 3 of the engine cowl overheat switch electrical connector.
 (9)  S 765-044Make sure that the voltage between pin 1 (+) and pin 2 (gnd) of the TAI valve electrical connector is 0 |3 volts dc.
 S 865-045

 (10)
 Set the applicable NACELLE ANTI-ICE switch to the off position and then back to the ON position.

 S 765-047

 (11)
 Make sure that the voltage between pin 1 (+) and pin 2 (gnd) of the TAI valve electrical connector is 28 |3 volts dc.

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747-400 MAINTENANCE MANUAL
 J. Auto Anti-Ice Test
 S 715-066
 (1)  Do an operational test of the ice detection system
 (AMM 30-81-00/501).

 K. Put the Airplane to its Initial Condition
 S 865-067
 (1)  Close 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 865-048
 (2)
Set the applicable NACELLE ANTI-ICE switch to the off position.

 S 865-049

 (3)  
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 435-050
 (4)  
Connect the electrical connector to the TAI valve.

 (5)  
Connect the electrical connector to the engine cowl overheat switch.

 S 865-077

 (6)  
Close this circuit breaker on the P6, Main Power Distribution Panel for the applicable engine:

 S 435-051
 (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 415-048
 (7)  
Close the fan cowl panels (AMM 71-11-04/201).

 S 415-106

 (8)  
AIRPLANES WITH ACCESS DOOR ON THE FORWARD FAIRING; Close the TAI access door.
　
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