(b)  
11G4, VHF COMM CENTER (if installed)

 (c)  
11G31, VHF COMM RIGHT

 S 024-001
 (2) Remove the VHF communication transceiver, (AMM 20-10-01/401).
 TASK 23-12-01-424-003
 3.  Install the VHF Communication Transceiver_________________________________________
 A.  References
 (1)  
AMM 20-10-01/401, E/E Rack Mounted Components

 (2)  
AMM 24-22-00/201, Electrical Power - Manual Control

 B.  Access
 (1)  Location Zones
 119/120 Main Equipment Center

 C.  Procedure
 S 424-005
 (1)
Install the VHF communication transceiver (AMM 20-10-01/401).

 S 864-006

 (2)  
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the overhead circuit breaker panel, P11, as required:

 (a)  11C3, VHF COMM LEFT
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 (b)  
11G4, VHF COMM CENTER (if installed)

 (c)  
11G31, VHF COMM RIGHT

 D. Installation Test
 S 744-030
 (1)  AIRPLANES WITH COLLINS VHF-700/700A TRANSCEIVERS;
 Do the steps that follow:

 (a)  
Supply electrical power (AMM 24-22-00/201).

 (b)  
Set the STBY PWR switch, on the pilots' overhead panel P5, to the AUTO position.

 (c)  
Push and hold the SQL/LAMP TEST switch on the transceiver front panel. 1) Make sure the red CONTROL INPUT FAIL, and green LRU PASS

 lights on the transceiver front panel come on and stay on.

 (d)  
Release the SQL/LAMP TEST switch.

 (e)  
Push and release the TEST switch on the VHF transceiver front panel.

 (f)  
Make sure of the conditions that follow: 1) The CONTROL INPUT FAIL light does not come on. 2) The green LRU PASS light comes on for approximately four

 seconds. 3) The display shows less than 3.0.
 S 744-034
 (2)  AIRPLANES WITH BENDIX RTA-44A TRANSCEIVERS; VHF Communication Transceiver Installation Test Do these steps to do a test of the VHF communication transceiver:
 (a)  
Supply electrical power (AMM 24-22-00/201).

 (b)  
Set the STBY PWR switch, on the pilots' overhead panel P5, to AUTO.

 (c)  
Push and hold the SQ/TEST switch on the VHF transceiver front panel.

 (d)  
Make sure the conditions that follow occur: 1) The three front panel lights come on for three seconds, then go off. 2) After three seconds, the green COMM light comes on and

 stays on until the SQ/TEST pushbutton switch is released. 3) The red COMM light and red DATA IN light stay off.
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 E.  Put the Airplane Back to Its Initial Condition S 864-008
 (1) Remove electrical power if it is not necessary (AMM 24-22-00/201).
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 VHF COMMUNICATION CONTROL PANEL - REMOVAL/INSTALLATION
______________________________________________________
 1.  General
_______
 A.  The left, right, and center (if installed) VHF communication control panels M78, M79 and M90 are installed on the pilots' aft control stand P8. The removal and installation procedures are the same for each of the control panels.
　
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