When I first started in aviation, we didn't have that many task cards requiring the wires to be meggered. Maybe this work was done at other checks. I work at an MRO doing mostly heavy checks.
Now we have quite a few cards requiring the megger. From testing wiring to fuel pumps. The older planes get a lot more of this. And the McDonald Douglas planes get a whole lot of it. Could just be because of the aging fleet and wire insulation breaking down.
I'm sure they do a lot of testing on the new systems. I have never been involved in the manufactering of aircraft, so I don't see this part.
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