. English: Soviet Astronaut Propulsion Unit SPK 21KS, flown on a 1990 Mir mission by Viktorenko and Serebrov. Stabilized, weighs 180 kg, has maximum 10° rotational speed and an emergency mode (5°/s per s acceleration), has delta-v of 30 m/s. Non-tethered (test flight used a safety line). February 1st or 5th, 1990. Main Directorate of Space Development, Ministry of Defense, USSR (GUKOS) 53 Soviet Astronaut Propulsion Unit SPK 21KS, flown on a 1990 Mir mission by Viktorenko and Serebrov

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Keywords: ., /., 1990., 1st, 5th, deve, directorate, february, main, space