Mightychan
Member
Hi all, 2005 420 DA, fully mechanical 6CTA engines, original gauges and VHF. I just noticed that, at idle, if I key the VHF, the starboard tach rises to about 1000 RPM (from about 550 RPM idle). Once I am over 1000 RPM, keying the VHF causes no change, but at any speed less than 1000 RPM, keying the VHF will cause the tach to rise. Obviously, the engine is not accelerating. This doesn't seem to be causing any problems, I am just wondering if anyone else has experienced this, and if it is something that I should address. Thanks!