 The fuselage was lengthened by , a larger nose radome was fitted for the AN/APG-66 radar, wing area was increased from to , the tailfin height was decreased, the ventral fins were enlarged, two more stores stations were added, and a single door replaced the original nosewheel double doors.The F-16's weight was increased by 25% over the YF-16 by these modifications.The FSD F-16s were manufactured by General Dynamics in Fort Worth, Texas at United States Air Force Plant 4 in late 1975; the first F-16A rolled out on 20 October 1976 and first flew on 8 December.