Anyone with significant experience working on cars can tell you some of the problems you get with parts that don't get the scrutiny of parts in the aerospace in

Anyone with significant experience working on cars can tell you some of the problems you get with parts that don't get the scrutiny of parts in the aerospace industry: * Where did this thing come from and what can I expect from its performance? -- is it new? used? new old stock that has been sitting on a shelf? remanufactured? * Is this even manufactured to the correct spec? The manufacturer claims this coil pack meets OEM spec, but it doesn't work...? * Wait, why isn't this bolt going in? The hole isn't threaded? * Hold up, this part doesn't fit at all. * These parts don't look factory.... how do I fix this? * This part broke after one week? The last thing I want on my airplane is something that was handed over the counter at Autozone.