(b)  
P6 Circuit Breaker Panel
 1) HF-2 AC (if installed)
 2) HF-2 DC

 S 864-032
 (3)  Make sure that the circuit breaker (if installed) for the other panel is open.
 NOTE: You will close one circuit breaker at a time to do a check
____
 for a cross-connection.

 E. Installation Test
 S 864-009
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 714-016

 (2)  
Do these steps to do the installation test:

 (a)  Use the new HF communication control panel to set the applicable HF communication system to a test frequency.
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 (b)  
Do these steps at the audio selector panel for the applicable HF communication system: 1) Push and release the applicable HF switch.

 a) Make sure the HF switch light comes on. 2) Adjust the HF volume control for a satisfactory sound level.

 (c)  
Do these steps at the HF communication control panel: 1) Set the mode select switch to the applicable mode of operation (USB/LSB/SSB or AM). 2) Set the frequency display to an HF frequency (which transmits frequently).

 3)  If it is necessary, adjust the RF SENS knob for a satisfactory sound level. a) Make sure the received voice is satisfactory.

 (d)  
Set the mode select switch on the HF communication control panel to the OFF position.

 S 864-033
 (3)  Remove the DO-NOT-CLOSE tag and close the circuit breaker for the other HF communication control panel (if installed.
 (a)  
P18 Circuit Breaker Panel
 1) HF-1 AC
 2) HF-1 DC

 (b)  
P6 Circuit Breaker Panel
 1) HF-2 AC (if installed)
 2) HF-2 DC

 (c)  
Use the appllicable HF communication control panel to set the HF communication system to a test frequency.

 (d)  
Do these steps at the audio selector panel for the applicable HF communication system: 1) Push and release the applicable HF switch.

 a) Make sure the HF switch light comes on. 2) Adjust the HF volume control for a satisfactory sound level.

 (e)  
Do these steps at the HF communication control panel:

 1)  Set the mode select switch to the applicable mode of operation (USB/LSB/SSB or AM).
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 2)  Set the frequency display to an HF frequency (which transmits frequently).
 3)  If it is necessary, adjust the RF SENS knob for a satisfactory sound level. a) Make sure the received voice is satisfactory.
 (f)  Set the mode select switch on the HF communication control panel to the OFF position.
 F.  Put the Airplane Back to Its Initial Condition
 S 864-013
 (1)  Remove the electrical power if it is not necessary
 (AMM 24-22-00/201).

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 HF COMMUNICATION ANTENNA - REMOVAL/INSTALLATION
_______________________________________________
 1. General
_______
 A. Two tasks are in this procedure:
 (1)  
Removal of the HF communication antenna.

 (2)  
Installation of the HF communication antenna.
　
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