Please allow me to add, for perspective, that when I was part of a small group, and I trusted the maintenance guys, they would give me the “problem children“ airplanes. Because they know I could handle the problem, and they knew they would get a thorough examination, troubleshooting, and debrief of the problem.
For example, when I was getting night carrier qualified again, as a RAG instructor returning to fleet, we had an airplane aboard ship that did not have any functioning instrument approach system.
Both the ACLS, and the ILS, systems in this airplane were not working and our maintenance guys were unable to troubleshoot the problem.
If it were a student operating that airplane, they would not be allowed to attempt the carrier landing and would be sent back to home base.
A simultaneous failure of both systems would constitute an emergency. But I took that jet around the pattern for four arrested landings, on two successive nights.
We flew the equivalent of a non-precision approach, and I had a fair amount of time in the airplane. So, maintenance was able to give me the “problem child“, thereby saving the good aircraft for the students who had never landed on a carrier before, and I willingly took the airplane.
In 28+ years as an airline pilot, I have never flat out refused to take an airplane. I have had some discussions, and negotiation, with dispatch and maintenance.
I have a great deal of confidence in my airline mechanics. I mean that sincerely. I’ve never had to refuse an airplane.
But I reserve the right to do so.