on idle cutoff 90-110#, slowly building till secondaries cut in around 220-250# this is -67 , don't remember the -42 numbers
thanks for answering . however- i do not think this is what you read on the fuel flow gauges starting any real pt6.
In The King Air Book, Tom Clements suggests starting the second engine with both generators off, though once the N1 is through a certain value (not a book figure, just suggested) turning on the generator of the running engine. This will provide higher N1 and a cooler start.
thats pretty correct. start one engine, turn on generator , load battery, turn off again, start the second and at lets say 30% ,when the current from the starter dropped , kick the opposite generator in.
cheers