1. Listen to ATIS using pilot headphones jack
2. Turn power to the intercom off
3. Turn up SL40 volume
Is the distortion still there? If yes, the problem is in the SL40. If no, the problem is in the intercom.
Edit: I re-read your post, I see you’ve done the test. There’s a problem in the intercom.
Last edited by BobTurner : 10-11-2019 at 10:15 PM.