So here’s my scenario:
You’re flying an airplane that you have received no (formal factory) Training in, you’re not a Cirrus certified instructor ( which you have no requirement to be but hold on) you log the “dual given” (and PIC) therefore accepting responsibility for the outcome of the flight.
Like I stated earlier, an accident or incident will bring a lot of scrutiny as to who is what and who is doing what on board this airplane.
What does the owners insurance policy say about flight instruction on his airplane ? Min reqs for the instructor?
Min hours? Min Training received?
Sure, whatch out there’s traffic, clean up your steep turn....dual given log it.
Why not.
But there’s a little more to it then just putting a pen to paper.
Here’s what I would recommend you do:
Have a coffee with the owner and be very honest and upfront.
“I really appreciate you taking me up and I would love to log the time but in order to legally do so may I please review your insurance policy and will you allow me to sign your logbook.”
If not then all is good and just enjoy the experience and be grateful he takes you up.