I've wondered the same. It also applies to Piper PA31s. It could be a system limitation that, under a certain set of circumstances, doesn't guarantee the fuel supply. Or, pragmatically, the manufacturer may not have bothered testing that ability during certification.
For the orginial question re start:
Older Kingairs have 300 amp current limiters - essentially a big fuse - in the electrical path between each generator's buss and the other engine's starter/generator. During start the starter pulls around 1000 amps which reduces rapidly after ignition. Delaying the use of the 1st engine's generator when starting the second reduces the chance of blowing the current limiter. Newer Kingairs have a different electrical system that removes that limitation. Can't remember how, other than it's a 5 buss system, as was written in an earlier post.
Last edited by Tinstaafl; 27th Aug 2013 at 17:12.