That is why the law judge found in favor of the CFI. A couple of notes though. The airplane belonged to the school that the CFI worked for, not the commercial pilot. They had the airplane at an airshow at which the CFI and the pilot had volunteered to work for the school. The pilot volunteered to fly the Diamond back to the school but he had not flown a Diamond before. He asked the CFI to ride along and provide an aircraft checkout, the CFI refused, stating that the checkout was unneccessary, and it was agreed that the CFI would only be a passenger. The NTSB agreed that the pilot was current and qualified in class and category and therefore did not legally require a checkout.
The real problem is the trust and understanding between the pilots and an often unforgiving FAA/NTSB. If the problem was something that you could have reasonably noticed and corrected than you may be held responsible. You may have agreed that you are not acting as an instructor, but you are still an instructor in both the FAA's eyes and the other Pilot's eyes. Even if the other pilot agree's that you are not acting as an instructor, there is an assumption that an experienced pilot (read instructor) is onboard, and would not be likely to let things get out of control without saying something. I have to admit that I have flown with owner's many times and I'm usually very aware of what they are doing during critical phases of flight. I have flown with relatively experienced pilots, in their own airplanes, that have done dumb things like porpoise the airplane or lose control in cross winds and then just stop flying because they think I will fix it, (and believe me, I do!
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It is unfortunate perhaps, but you are assuming a big responsibilty when you become a flight instructor. The FAA tends to be heavy handed with instructors, and insurance companies are always looking for a scapegoat too. Beware! It could even be argued that it is unreasonable for an experienced pilot (read CFI) to be sound asleep, while sitting at the controls, in the right seat, during a landing. I wake my passengers up during critical phases of flight so that they can be alert and prepared in case there is an emergency.
I'm not saying I agree or disagree with any of this, I'm simply passing on what I read and heard. I have saved out of control landings many times, seconds before, during, and after touch down and many CFI's have been found responsible for a students faulty landing. In this case, the CFI could have taken control, applied full throttle, and continued the go around. The commericial pilot claimed he freaked out and didn't know what to do, and thought the CFI would take over, an arguably reasonable assumption given the CFI's greater experience. Would you have just sat there? I wouldn't have! And the NTSB didn't think the CFI should have either.
Crazy stuff. Lawyer's like crazy stuff, especially when dealing with distraut families and an uninformed jury.