Kazakh authorities also use it for passenger and charter flights from Russia. Site 254 – Built to service the Buran-class orbiters between flights (thus fulfilling a role similar to the OPF at KSC). Constructed in the 1980s as a special four-bay building, it also featured a large processing area flanked by several floors of test rooms. After cancellation of the Buran program it was adapted for pre-launch operations of the Soyuz and Progress spacecraft. Missions Following a series of atmospheric test flights using the jet-powered OK-GLI prototype, the first operational spacecraft (Orbiter K1) flew one test mission on 15 November 1988 at 03:00:02 UTC. The spacecraft was launched uncrewed from and landed at Baikonur Cosmodrome in the Kazakh S.S.R. and flew two orbits, travelling in 3 hours and 25 minutes (0.14 flight days). Buran never flew again; the program was cancelled shortly after the dissolution of the Soviet Union. In 2002, the collapse of the hangar in which it was stored destroyed the Buran K1 orbiter. Atmospheric test flights An aerodynamic testbed, OK-GLI, was constructed in 1984 to test the in-flight properties of the Buran design. Unlike the American prototype , OK-GLI had four AL-31 turbofan engines fitted, meaning it was able to fly under its own power. Orbital flight of Buran 1.01 in 1988 The only orbital launch of Buran (orbiter 1K) was at 03:00 UTC on 15 November 1988 from pad 110/37 in Baikonur. The uncrewed craft was lifted into orbit by the specially designed Energia booster rocket. The life support system was not installed and no software was installed on the CRT displays. The shuttle orbited the Earth twice in 206 minutes of flight. On its return, it performed an automated landing on the shuttle runway at Baikonur Cosmodrome. Planned flights The planned flights for the shuttles in 1989, before the downsizing of the project and eventual cancellation, were: 1991 — Ptichka 1.02 uncrewed first flight, duration 1–2 days. 1992 — Ptichka 1.02 uncrewed second flight, duration 7–8 days. Orbital manoeuvres and space station approach test. 1993 — Buran 1.01 uncrewed second flight, duration 15–20 days. 1994 — Orbiter 2.01 first crewed space test flight, duration of 24 hours. Craft equipped with life-support system and with two ejection seats. Crew would consist of two cosmonauts with Igor Volk as commander, and Aleksandr Ivanchenko as flight engineer. 1994-1995 - Second, third, fourth and fifth crewed orbital test flights.