Originally Posted by
Fursty Ferret
Never seen this before so can't offer more than a guess, but the same motor controllers used for engine start also handle the CACs. Perhaps there was a logic condition which was preventing the controllers disconnecting from the CACs and supplying the VFSGs on the engines, which was cleared by pushing the air con reset button? As I said, just a guess though.
That seems like a correct assumption. I have never seen this as part of an approved fault isolation procedure but it seems like a good way to correct such a scenario.