The B-99,1900 has dual "crackers" & i think the Fairchild had Garrett "Grenades" I remember as a young pup doing a compressor wash on a B-1900 i was sitting in the cockpit operating the starter & the inspector would hide under the a/c & snap the metal paper holder on a clipboard. It scared the hell out of me! The starter switch had 3 positions, off, starter only & start ign. Of course I had the s/w in starter only ,but he sure got me!