Showerthought: My first APU start failure in Wichita taught me more than a year of line work | Avionics Technicians

Parker Grant · 2026-10-03T16:05:03.746539+00:00

Had an APU fail to spin up in Wichita last month, and instead of swapping the start relay I pulled the schematic and traced the whole start circuit. Turned out to be a chafed wire behind the aft pressure bulkhead that only grounded when the fuselage flexed on the ground, has anyone else chased a ghost like that?

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Showerthought: My first APU start failure in Wichita taught me more than a year of line work | Avionics Technicians - The Community Guide