I have Dash 8 100/300 audio panel questions regarding contacting the F/A.

What is the difference in selecting PA versus INT on the rotary dial?

I know I must push call or emer on the interphone control unit to contact the f/a, but the rotary dial is throwing me off. I also notice the pre 1990 has no PA option on the rotary dial.


Geez I feel like such a noob.