Orbiter Processing Facility

An Orbiter Processing Facility was one of three hangars where U.S. space shuttle orbiters underwent maintenance between flights. All three such facilities, OPF-1, OPF-2 and OPF-3, were located at NASA's Kennedy Space Center in Florida at Launch Complex 39.They were located west of the Vehicle Assembly Building, where the orbiter was mated with its External Tank and Solid Rocket Boosters before transport to the launch pad. OPF-1 and OPF-2 are connected with a low bay between them, while OPF-3 is across the street.OPF-3 was previously called the Orbiter Maintenance & Refurbishment Facility, but was upgraded to a fully functioning OPF.