I once flew on a little junk plane. I can't believe they allowed such a crappy plane to fly. It was actually kind of cool in a weird way. It sounded like it was going to break apart in the sky.
Another time, we had to wait for the pilot to decide whether we would fly or get some of the electric work repaired. They couldn't fix the problems so the pilot decided to go. She reassured us that the electrical problems that interfered with starting up will not interfere with flying. I forget....may the electrical engineers here may know how that works.
The flight was absolutely fine but some people were very concern that the electrical ground problems that caused the plane to not work correctly will have the same problem in the sky. Once she switched off the "ground electrical work" all was well. Darn it I should know this stuff after being with my aviator ex.