Declaring an emergency is, oddly, fairly routine. There are surely dozens each day. (I’ve declared three in a little over 1500 hours of flying piston aircraft.)
When you have an abnormal condition that gives you doubt about the aircraft state and priority ATC handling would be helpful, declare an emergency. It’s as simple as that.
When you have an abnormal condition that gives you doubt about the aircraft state and priority ATC handling would be helpful, declare an emergency. It’s as simple as that.