(i)  
Install relay R7434 in the P415 Right Power Distribution Center.

 I. Lower Right Pitot Probe Heat Test
 S 865-035
 (1)  
Close 6D35, PROBE HEAT IND R and 6D33, PROBE HEAT AUX PITOT R circuit breakers on the P6, Main Power Distribution Panel.

 S 715-036

 (2)  
Make sure that the lower right pitot probe heaters operate:

 (a)  Make sure that the EICAS advisory message HEAT P/S R AUX shows.
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 (b)  
Make sure that the lower right pitot probe temperature does not increase.

 (c)  
Open 7H8, GND SAFETY RELAY circuit breaker on the P7, Overhead Circuit Breaker Panel.

 (d)  
Make sure that the EICAS advisory message HEAT P/S R AUX does not show.

 (e)  
Make sure that the lower right pitot probe temperature increases.

 (f)  
Close 7H8, GND SAFETY RELAY circuit breaker on the P7, Overhead Circuit Breaker Panel.

 (g)  
Make sure that the EICAS advisory message HEAT P/S R AUX shows.

 S 715-037
 (3)  Make sure that the lower right pitot probe head heater operates:
 (a)  
Open 6D35, PROBE HEAT IND R and 6D33, PROBE HEAT AUX PITOT R circuit breakers on the P6, Main Power Distribution Panel.

 (b)  
Remove relay, R7438, from the P415, Right Power Distribution Center.

 (c)  
Close 6D35, PROBE HEAT IND R and 6D31, PROBE HEAT AUX PITOT R circuit breakers on the P6, Main Power Distribution Panel.

 (d)  
Open 7H8, GND SAFETY RELAY circuit breaker on the P7, Overhead Circuit Breaker Panel.

 (e)  
Make sure that the EICAS advisory message HEAT P/S R AUX do not show.

 (f)  
Make sure that the lower right pitot probe head temperature increases.

 (g)  
Close 7H8, GND SAFETY RELAY circuit breaker on the P7, Overhead Circuit Breaker Panel.

 (h)  
Open 6D35, PROBE HEAT IND R and 6D33, PROBE HEAT AUX PITOT R circuit breakers on the P6, Main Power Distribution Panel.

 (i)  
Install relay R7438 in the P415 Right Power Distribution Center.

 S 715-038
 (4)  Make sure that the lower right pitot probe strut heater operates:
 (a)  Remove relay, R7436, from the P415, Right Power Distribution Center.
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 (b)  
Close 6D35, PROBE HEAT IND R and 6D33, PROBE HEAT AUX PITOT R circuit breakers on the P6, Main Power Distribution Panel.

 (c)  
Open 7H8, GND SAFETY RELAY circuit breaker on the P7, Overhead Circuit Breaker Panel.

 (d)  
Make sure that the EICAS advisory message HEAT P/S R AUX does not show.

 (e)  
Make sure that the lower right pitot probe strut temperature increases.

 (f)  
Close 7H8, GND SAFETY RELAY circuit breaker on the P7, Overhead Circuit Breaker Panel.

 (g)  
Open 6D35, PROBE HEAT IND R and 6D33, PROBE HEAT AUX PITOT R circuit breakers on the P6, Main Power Distribution Panel.

 (h)  
Install relay, R7436, in the P415, Right Power Distribution Center.

 S 715-039
 (5)  Make sure that the lower right pitot probe heat operates on the ground with an engine on signal:
 (a)  
Remove relay R7438 from the P415 Right Power Distribution Center.

 (b)  
Close 6D35, PROBE HEAT IND R and 6D33, PROBE HEAT AUX PITOT R circuit breakers on the P6, Main Power Distribution Panel.

 (c)  
Hold the S2 switch on the YMLA007 ENG 4 N2 speed card in the forward electrical systems card file to TEST.
　
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