Luna 6 - USSR Lunar Soft Lander - 1,440 kg - that was launched on June 8, 1965, proceeded as planned until the major midcourse correction late on June 9.
Although the main retro-rocket engine (the S5.5A) ignited on time, it failed to cut off and continued to fire until propellant supply was exhausted.
An investigation later indicated that the problem had been due to human error; a command had been mistakenly sent to the timer that ordered the main engine to shut down.
Although the spacecraft was sent on a completely wrong trajectory, ground controllers put the spacecraft through a series of steps to practice an actual landing, all of which were satisfactorily accomplished.
Luna 6 passed by the Moon late on 11 June at a range of 161,000 kilometers and eventually entered heliocentric orbit.
Contact was maintained to a distance of 600,000 kilometers from Earth.
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