(b)
Make sure the V/S flag does not show on the captain's PFD.
(c)
Make sure the V/S flag does not show on the first officer's PFD.
S 865-051
(33)
Close the 7A14 ADC R PWR circuit breaker on the P7 overhead circuit breaker panel.
S 865-154
(34)
Set the AIR DATA switch on the captain's SOURCE SELECT module to the L position.
(a) Make sure the advisory message, >SOURCE SEL ADC, does not show on the top EICAS display.
S 865-053
(35) Set the EIU switch on the captain's SOURCE SELECT module to the L position.
I. TAT Probe Test
S 865-085
(1)
Open the 7A14 ADC R PWR and 7J15 ADC C PWR circuit breakers on the P7 overhead circuit breaker panel.
S 865-088
(2)
Apply pressure of at least 10 psig to the pneumatic system air supply manifold (Ref 36-00-00/201).
S 485-089
(3)
Put a thermometer near the left TAT probe to measure the
temperature.
NOTE: Shield the thermometer from direct wind or sunlight and
____ permit it to come to equilibrium before you read the temperature.
(a) After 10 seconds, make sure the total air temperature shown on the top EICAS display is the same as the temperature measured on the thermometer | 3.0 degrees C.
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A 747-400 MAINTENANCE MANUAL
(4) S 085-090Remove the thermometer from the left TAT probe.
(5) S 865-348Close the 7A14 ADC R PWR circuit breaker on the P7 overhead circuit breaker panel.
(6) S 865-092Open the 7A10 ADC L PWR circuit breaker on the P7 overhead circuit breaker panel.
(7) S 485-093Put a thermometer near the right TAT probe to measure the temperature.
NOTE:____ Shield the thermometer from direct wind or sunlight and permit it to come to equilibrium before you read the temperature.
(a) After 10 seconds, make sure the total air temperature shown on the top EICAS display is the same as the temperature measured on the thermometer | 3.0 degrees C.
(8) S 085-094Remove the thermometer from the right TAT probe.
(9) S 725-095Do these steps to do a test of the TAT probe for the center ADC: (a) Open the 7A14 ADC R PWR circuit breaker on the P7 overhead circuit breaker panel. (b) Close the 7J15 ADC C PWR circuit breaker on the P7 overhead circuit breaker panel. (c) Put a thermometer near the right TAT probe to measure the temperature.
NOTE:____ Shield the thermometer from direct wind or sunlight and permit it to come to equilibrium before you read the temperature.
1) After 10 seconds, make sure the total air temperature shown on the top EICAS display is the same as the temperature measured on the thermometer | 3.0 degrees C.
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A
747-400 MAINTENANCE MANUAL
(d)
Remove the thermometer from the right TAT probe.
(e)
Close the 7A14 ADC R PWR circuit breaker on the P7 overhead circuit breaker panel.
S 865-103
(10)
Close the 7A10 ADC L PWR circuit breaker on the P7 overhead circuit breaker panel.
S 865-349
(11)
Remove the pressure from the pneumatic system air supply mainfold (Ref 36-00-00/201).
J. Maximum Operating Speed Test
S 485-105
(1)
Connect an ARINC 429 bus reader to the L ADC front panel TEST ONLY connector.
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