S 715-019

 (10)
 Slowly decrease the selected altitude on the MCP.

 (a)  Make sure that the approach advisory indications occur.
 NOTE: You will complete this step when the selected altitude
____ goes through a value of 900 feet above the baro-corrected altitude.
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747-400 MAINTENANCE MANUAL
 S 715-020
 (11) Decrease the selected altitude until the selected altitude is the same as the baro-corrected altitude.
 (a)  
Make sure that the altitude displays on the PFD's go back to a satisfactory value.

 (b)  
Make sure that you cannot hear an aural warning.

 NOTE: You will complete this step when the selected altitude
____ goes through a value of 300 feet above the baro-corrected altitude.
 S 715-021
 (12) Slowly increase the selected altitude.
 (a)  Make sure that the deviation indications occur.
 NOTE: You will complete this step when the selected altitude
____ goes through a value of 300 feet above the baro-corrected altitude.
 S 715-022
 (13) Continue to increase the selected altitude.
 (a)  
Make sure that you do not see the deviation indications.

 (b)  
Make sure that the altitude displays on the PFD's go back to a satisfactory value.

 NOTE: You will complete this step when the selected altitude
____ goes through a value of 900 feet above the baro-corrected altitude.
 S 865-025
 (14) Set the captain's and first officer's EIU source select switches to the AUTO position.
 F. Air Data Input Test
 S 865-026
 (1)  Open these circuit breakers and attach DO-NOT-CLOSE tags:
 (a)  P7 Overhead Circuit Breaker Panel
 1) 7A14 ADC R PWR

 S 715-027
 (2)  Set the captain's and first officer's AIR DATA source select switches to the L position.
 (a)  Make sure that the PFD's show satisfactory altitude data.
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A 747-400 MAINTENANCE MANUAL
 (b)  Make sure that you do not see an altitude alert indication on the auxiliary EICAS display.
 (3)  S 715-028Set the captain's AIR DATA source select switch to the C position. (a) Make sure that the PFD's show satisfactory altitude data. (b) Make sure that you do not see an altitude alert indication on the auxiliary EICAS display.
 (4)  S 715-029Set the captain's AIR DATA source select switch to the R position. (a) Make sure that these displays occur on the captain's PFD: 1) Make sure that you do not see the altitude tape, altitude display box, selected altitude display, and selected altitude bug. 2) Make sure that you see a yellow ALT flag shown. 3) Make sure that you see the status indication ALT ALERT SYS shown on the auxiliary EICAS display.
 (5)  S 865-030Remove the DO-NOT-CLOSE tags and close these circuit breakers: (a) P7 Overhead Circuit Breaker Panel. 1) 7A14 ADC R PWR
 (6)  S 865-031Open these circuit breakers and attach DO-NOT-CLOSE tags: (a) P7 Overhead Circuit Breaker Panel. 1) 7A10 OR 7A11 ADC L PWR
 (7)  S 715-032Set the captain's and first officer's AIR DATA source select switches to the R position. (a) Make sure that the PFD's show satisfactory data. (b) Make sure that you do not see an altitude alert indication on the auxiliary EICAS display.
 (8)  S 715-033Set the first officer's AIR DATA source select switch to the C position. (a) Make sure that the PFD's show satisfactory data.

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