Unusual noise/crackling in the headset today somewhat tied to engine RPM, disappears when intercom turned off (PM3000). Basically unusually noisy background and then specific regular beating crackle noise when RPM hits around 1300 and goes away at 1500 or higher. Never happened before and nothing changed on the aircraft recently. Was fine flying earlier in the week.
0-360 with slick mags.
I could fly without the intercom but all the aural warnings are routed though it.
Any ideas about where to start troubleshooting or things to check?
Thanks
Figs
0-360 with slick mags.
I could fly without the intercom but all the aural warnings are routed though it.
Any ideas about where to start troubleshooting or things to check?
Thanks
Figs