(2)  
20-11-22/401, Rack-Mounted Electrical/Electronic Module

 B.  Access
 (1)  
Location Zones
 117/118 Electrical and Main Equipment Center

 (2)  
Access Panels 117AL Electronics compartment Center Access Door

 C.  Prepare for Removal
 S 864-122
 (1)  Open this circuit breaker and attach DO-NOT-CLOSE tag:
 (a)  P7, Overhead Circuit Breaker Panel:
 1) 7A5, TCAS

 S 014-121
 (2)  Open the access door (117AL) of the electronics compartment to get to the TCAS computer (Ref 06-09-01/201).
 D.  Procedure
 S 024-123
 CAUTION: DO NOT TOUCH THE CONNECTOR PINS OR OTHER CONDUCTORS ON THE
_______ TCAS COMPUTER. IF YOU TOUCH THESE CONDUCTORS, ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE TCAS COMPUTER.
 (1)  
Remove the TCAS computer (Ref 20-11-22/401).

 (2)  
Install dust caps on the electrical connectors.

 S 434-124
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747-400 MAINTENANCE MANUAL
 TASK 34-45-01-404-125
 3. TCAS Computer Installation
__________________________
 A. References
 (1)  
06-09-01/201, Body Section 41 Access Doors and Panels

 (2)  
20-11-22/401, Rack-Mounted Electronic/Electrical Module

 (3)  
24-22-00/201, Manual Control

 (4)  
34-45-00/501, TCAS

 B. Access
 (1)  
Location Zones 117/118 Electrical and Electronics Compartment

 (2)  
Access Panels
 117AL Electronics Compartment Access Door

 C. Prepare for Installation
 S 754-126
 (1)  Make sure this circuit breaker is open with the DO-NOT-CLOSE tag attached:
 (a)  
P7, Overhead Circuit Breaker Panel:

 (b)  
7A5, TCAS

 D. Procedure
 S 424-128
 CAUTION: DO NOT TOUCH THE CONNECTOR PINS OR OTHER CONDUCTORS ON THE TCAS
_______ COMPUTER. IF YOU TOUCH THESE CONDUCTORS, ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THIS TCAS COMPUTER.
 (1)  
Remove the dust caps from the electrical connectors.

 (2)  
Install the TCAS computer (Ref 20-11-22/401).

 (3)  
Make sure you have the correct TCAS part number.

 S 024-129
 S 284-132
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747-400 MAINTENANCE MANUAL
 S 474-133
 (4)  If you do not have the correct TCAS part number, do the TCAS software installation procedure (AMM 34-45-10/201).
 E. TCAS Computer Test
 S 864-130
 (1)  Remove the DO-NOT-CLOSE tag and close this circuit breaker:
 (a)  P7, Overhead Circuit Breaker Panel:
 1) 7A5, TCAS

 S 864-117
 (2)  
Supply electrical power (Ref 24-22-00/201).

 S 744-131

 (3)  
Do the TCAS Operational test (Ref 34-45-00/501).

 (a)  
Push the TEST switch on the front panel of the TCAS computer.

 (b)  
Make sure the green TCAS PASS light comes on after a few seconds.

 F. Put the Airplane Back to Its Usual Condition
 S 864-119
 (1)  Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

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