34-45-00
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747-400 MAINTENANCE MANUAL
 S 215-328
 (14)
 Make sure bit 25 is set to 1 and bit 26 is set to 0 of label 350 from the TCAS computer.

 S 865-241

 (15)
 Close these circuit breakers:

 (a)  On the P7 Overhead Circuit Breaker Panel:
 1) 7F09, EIU L
 2) 7F10, EIU C

 S 865-242
 (16) Push the traffic switch on the captain's and first officer's EFIS control panels.
 (a)  Make sure the captain's and first officer's ND show TFC and TA ONLY indications.
 S 865-243
 (17) Set the LWR CRT switch on the Capt Display Transfer Module to the ND position.
 (a)  Make sure the lower EICAS display shows the TFC and TA ONLY messages.
 S 865-244
 (18)
 Set the LWR CRT switch on the Capt Display Transfer Module to the NORM position.

 S 865-245

 (19)
 Set the LWR CRT switch on the F/O Display Transfer Module to the ND position.

 (a)  Make sure the lower EICAS display shows the TFC and TA ONLY messages.
 S 865-246
 (20) Set the LWR CRT switch on the F/O Display Transfer Module to the NORM position.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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747-400 MAINTENANCE MANUAL
 H. EICAS Interface Test
 S 865-144
 (1)  
Set the Ground Test Enable switch on the P461 panel to the ENABLE position.

 S 865-145

 (2)  
Set the EIU source select switch to L, then to C, and then to R on the source select panel.

 (a)  Make sure the upper EICAS display does not show TCAS FAIL for each EIU source select switch position.
 NOTE: You possibly will have to page through messages on
____
 the upper EICAS display.

 S 865-146
 (3)  Open this circuit breaker.
 (a)  P7 Overhead Circuit Breaker Panel:
 1) 7A5, TCAS

 S 215-147
 (4)  Make sure the upper EICAS display shows TCAS FAIL on all EIU source select switch position.
 NOTE: You possibly will have to page through messages on
____
 the upper EICAS display.

 S 865-148
 (5)  
Close this circuit breaker.

 (a)  P7 Overhead Circuit Breaker Panel:
 1) 7A5, TCAS

 (6)  
Make sure the upper EICAS display does not show TCAS FAIL.

 S 215-149
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747-400 MAINTENANCE MANUAL
 I. Put the Airplane Back to Its Usual Condition
 S 865-150
 (1)  Remove the electrical power if it is not necessary (AMM 24-22-00/201).
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747-400 MAINTENANCE MANUAL
 TRAFFIC ALERT AND COLLISION AVOIDANCE SYSTEM
____________________________________________ (TCAS) COMPUTER REMOVAL/INSTALLATION
____________________________________
 1.  General_______
 A.  This procedure has two tasks. One is the removal of the TCAS computer, the other is the installation of the TCAS computer.
 B.  The TCAS computer, B8385, is installed on the E1 rack ,on shelf No. 2, in the main equipment center.
 TASK 34-45-01-004-120
 2.  TCAS Computer Removal_____________________
 A.  References
　
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