(c)
Close 6D34, PROBE HEAT IND L and 6D32, PROBE HEAT AUX PITOT L circuit breakers on the P6 Main Power Distribution Panel.
(d)
Open 7F23, LANDING GEAR DSP & CONT ALTN circuit breaker on the P7, Overhead Circuit Breaker Panel.
(e)
Make sure that the EICAS advisory message HEAT P/S L AUX does not show.
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747-400 MAINTENANCE MANUAL
(f)
Make sure that the lower left pitot probe head temperature increases.
(g)
Close 7F23, LANDING GEAR DSP & CONT ALTN circuit breaker on the P7, Overhead Circuit Breaker Panel.
(h)
Open 6D34, PROBE HEAT IND L and 6D32 PROBE, HEAT AUX PITOT L circuit breakers on the P6, Main Power Distribution Panel.
(i)
Install relay, R7437, in the P414, Left Power Distribution Center.
S 715-028
(4) Make sure that the lower left pitot probe strut heater operates:
(a)
Remove relay, R7435, from the P414, Left Power Distribution Center.
(b)
Close 6D34, PROBE HEAT IND L and 6D32, PROBE HEAT AUX PITOT L circuit breakers on the P6, Main Power Distribution Panel.
(c)
Open 7F23, LANDING GEAR DSP & CONT ALTN circuit breaker on the P7, Overhead Circuit Breaker Panel.
(d)
Make sure that the EICAS advisory message HEAT P/S L AUX does not show.
(e)
Make sure that the lower left pitot probe strut temperature increases.
(f)
Close 7F23, LANDING GEAR DSP & CONT ALTN circuit breaker on the P7, Overhead Circuit Breaker Panel.
(g)
Open 6D34, PROBE HEAT IND L and 6D32, PROBE HEAT AUX PITOT L circuit breakers on the P6, Main Power Distribution Panel.
(h)
Install relay, R7435, in the P414, Left Power Distribution Center.
S 715-029
(5) Make sure that the lower left pitot probe heater operates on the ground with an engine on signal:
(a)
Remove relay, R7437, from the P414, Left Power Distribution Center.
(b)
Close 6D34, PROBE HEAT IND L and 6D32, PROBE HEAT AUX PITOT L circuit breakers on the P6, Main Power Distribution Panel.
(c)
Set the S1 switch on the YMLA003 ENG 2 N2 speed card in the forward electrical systems card file to TEST.
(d)
Make sure that the EICAS advisory message HEAT P/S L AUX does not show.
(e)
Make sure that the lower left pitot probe head temperature increases at a lower rate.
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747-400
MAINTENANCE MANUAL
(f)
Set the S1 switch on the YMLA003 ENG 2 N2 speed card to NORMAL.
(g)
Alternative steps to do a check of the probe heater operation: 1) Set the S1 switch on the YMLA003 ENG 1 N2 speed card to
TEST. 2) Measure the voltage at Pin B1 of Relay socket DR7435. 3) Make sure the voltage measurement is from 60 to 65 volts,
with a digital multimeter on the AC scale. 4) Set the S1 switch on the YMLA003 ENG 1 N2 speed card to NORMAL.
(h)
Open 6D34, PROBE HEAT IND L and 6D32, PROBE HEAT AUX PITOT L circuit breakers on the P6 Main Power Distribution Panel.
(i)
Install relay, R7437, in the P414, Main Power Distribution Panel.
H. Upper Right Pitot Probe Heat Test
S 865-030
(1)
Close 6D35, PROBE HEAT IND R and 6D31, PROBE HEAT PITOT R circuit breakers on the P6, Main Power Distribution Panel.
S 715-031
(2)
Make sure that the upper right pitot probe heaters operate:
(a)
Make sure that the EICAS advisory message HEAT P/S F/O shows.
(b)
Make sure that the upper right pitot probe temperature does not increase.
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