Is it possible to be allowed to fly your own little propellor airplane (like a piper seneca) if you have a?

Question

prosthetic left arm ? Would you be able to pass the medical test ?

Answer 1

Yes. You may have to jump through a few more bureacratic hoops, like a statement of demonstrated ability or a waiver, but it can be done.

I had a multiengine student who had only one arm. The designated examiner that I sent him up with had only one leg. Between the two of 'em they had enough limbs to fly the aircraft. He passed his ride. It can be done.

Answer 2

The Seneca is a twin, and has pretty complex controls.  Start with a very simple single engine airplane before deciding how complex an airplane you can handle.

Many amputations can be managed in a way that will allow you to pass the third class medical exam with waivers, so long as you are otherwise in good health.

Consult the FAA Flight Surgeon's office on line for basic advice about the process you will go through.