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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (v)  
Close the 7J17 ADC C P/S XFR VLV circuit breaker on the P7 overhead circuit breaker panel. 1) Make sure the status message, P/S XFR VALVE, does not show

 on the bottom EICAS display.

 (w)  
Set the AIR DATA switch on the captain's SOURCE SELECT module to the R position.

 S 865-969
 (20)
 Open the 414L08 CMC L circuit breaker on the P414 circuit breaker panel.

 S 745-997

 (21)
 Push the AIR DATA CMPTR-L line select key on the CDU.

 (a)  Make sure these conditions occur for approximately 2 seconds: 1) The Master Warning lights on the glareshield come on. 2) The overspeed aural warning is heard from the aural warning
 speaker. 3) The warning message, >OVERSPEED, shows on the top EICAS display.
 S 745-998
 (22) Push the AIR DATA CMPTR-C line select key on the CDU.
 (a)  Make sure these conditions occur: 1) The Master Warning lights on the glareshield do not come on. 2) The overspeed aural warning is not heard from the aural warning speaker.
 3)  The warning message, >OVERSPEED, does not show on the top EICAS display.
 S 745-002
 (23) Push the AIR DATA CMPTR-R line select key on the CDU.
 (a)  Make sure these conditions occur for approximately 2 seconds: 1) The Master Warning lights on the glareshield come on. 2) The overspeed aural warning is heard from the aural warning
 speaker. 3) The warning message, >OVERSPEED, shows on the top EICAS display.
 S 865-003
 (24)
 Close the 414L08 CMC L circuit breaker on the P414 circuit breaker panel.

 S 865-973

 (25)
 Set the AIR DATA switch on the first officer's SOURCE SELECT module to the R position.

 (a)  Make sure the advisory message, >SOURCE SEL ADC, does not show on the top EICAS display.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

 (b)  Make sure the ALT flag does not show on the captain's and first officer's PFD's.
 S 865-974
 (26) Open the 7A14 ADC R PWR circuit breaker on the P7 overhead circuit breaker panel.
 (a)  
Make sure the ALT flag shows on the captain's and first officer's PFD's.

 (b)  
Make sure the status message, ADC RIGHT, shows on the bottom EICAS display.

 S 865-975
 (27)
 Set the EIU switch on the captain's SOURCE SELECT module to the C position.

 S 865-132

 (28)
 Set the EIU switch on the first officer's SOURCE SELECT module to the C position.

 (a)  Make sure the ALT flag shows on the captain's and first officer's PFD's.
 S 865-134
 (29) Close the 7A14 ADC R PWR circuit breaker on the P7 overhead circuit breaker panel.
 (a)  
Make sure the ALT flag does not show on the captain's and first officer's PFD's.

 (b)  
Make sure the status message, ADC RIGHT, does not show on the bottom EICAS display.

 S 865-022
 (30)
 Set the EIU switch on the captain's SOURCE SELECT module to the R position.

 S 865-043

 (31)
 Set the EIU switch on the first officer's SOURCE SELECT module to the R position.

 (a)  Make sure the ALT flag does not show on the captain's and first officer's PFD's.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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