Aircraft should be repaired only by competent mechanics but they should be looked after by their owners and operators; plus, there are situations in which any sort of technician may not be available, so every pilot should know what to do for expedient field repairs.
So, if the next mechanic is in a galaxy far away, what do you do
with your mighty, albeit malfunctioning, bush plane in the middle of
nowhere? Rules and regulations say that you have to bring the mechanic
in, let him work and then get off with your airplane, but that is not
always practical or feasible at all.