(b)  
Set the AIR DATA switch on the first officer's SOURCE SELECT module to the C position. 1) Make sure the advisory message, >SOURCE SEL ADC, shows on

 the top EICAS display.

 (c)  
Push the AIR DATA CPTR-L line select key on the CDU. 1) Make sure these conditions occur: a) The Master Warning lights on the glareshield are not on. b) The overspeed aural warning is not heard from the aural warning speaker.

 c)  The warning message, >OVERSPEED, does not show on the top EICAS display.

 (d)  
Push the AIR DATA CMPTR-C line select key on the CDU.

 1)  Make sure these warnings occur for approximately 2 seconds: a) The Master Warning lights on the glareshield are on. b) The overspeed aural warning is heard from the aural
 warning speaker. c) The warning message, >OVERSPEED, shows on the top EICAS display.
 (e)  
Push the AIR DATA CMPTR-R line select key on the CDU. 1) Make sure these conditions occur: a) The Master Warning lights on the glareshield are not on. b) The overspeed aural warning is not heard from the aural warning speaker.

 c)  The warning message, >OVERSPEED, does not show on the top EICAS display.

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

 (g)  
Make sure the V/S flag shows on the captain's and first officer's PFD's.

 (h)  
Open the 7J15 ADC C PWR circuit breaker on the P7 overhead circuit breaker panel. 1) Make sure the ALT flag shows on the captain's and first

 officer's PFD's. 2) Make sure the V/S flag shows on the captain's and first officer's PFD's. 3) Make sure the status message, ADC CENTER, shows on the bottom EICAS display.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 34-12-00
 ALL  ú ú 08 Page 518 ú Feb 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 
747-400 
MAINTENANCE MANUAL
 (i)  Close the 7J15 ADC C PWR circuit breaker on the P7 overhead
 circuit breaker panel.
 1) Make sure the status message, ADC CENTER, does not show on
 the bottom EICAS display.
 (j)  Set the EIU switch on the captain's SOURCE SELECT module to the
 C position.
 (k)  Set the EIU switch on the first officer's SOURCE SELECT module
 to the C position.
 (l)  Open the 7A17 AOA ALTN R and 7J17 ADC C P/S XFR VLV circuit
 breakers on the P7 overhead circuit breaker panel.
 (m)  Set the AIR DATA switch on the captain's SOURCE SELECT module
 to the R position.
 1) Make sure the advisory message, >SOURCE SEL ADC, does not
 show on the top EICAS display.
 2) Make sure the status message, AOA RIGHT, shows on the
 bottom EICAS display.
 3) Make sure the status message, P/S XFR VALVE, shows on the
 bottom EICAS display.
 (n)  Close the 7A17 AOA ALTN R and 7J17 ADC C P/S XFR VLV circuit
 breakers on the P7 overhead circuit breaker panel.
 1) Make sure the status message, AOA RIGHT, does not show on
 the bottom EICAS display.
 2) Make sure the status message, P/S XFR VALVE, does not show
 on the bottom EICAS display.
 (o)  Set the AIR DATA switch on the captain's SOURCE SELECT module
 to the C position.
 (p)  Set the EIU switch on the captain's SOURCE SELECT module to the
 L position.
 (q)  Set the EIU switch on the first officer's SOURCE SELECT module
 to the L position.
 1) Make sure the ALT flag does not show on the captain's and
 first officer's PFD's.
 2) Make sure the V/S flag shows on the captain's and first
 officer's PFD's.
 (r)  Open the 7J15 ADC C PWR circuit breaker on the P7 overhead
 circuit breaker panel.
 1) Make sure the ALT flag shows on the captain's and first
 officer's PFD's.
 2) Make sure the V/S flag shows on the captain's and first
 officer's PFD's.
 (s)  Close the 7J15 ADC C PWR circuit breaker on the P7 overhead
 circuit breaker panel.
 (t)  Open the 7J17 ADC C P/S XFR VLV circuit breaker on the P7
 overhead circuit breaker panel.
 (u)  Set the AIR DATA switch on the first officer's SOURCE SELECT
　
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