Half a century ago, on 20 July 1969, Neil Armstrong was in the final stages of the lunar descent, just a few thousand feet above the surface, when suddenly his on-board computer indicated a critical alarm. For three nail-biting seconds it looked as if the mission would have to be aborted. However, Armstrong was given a “go” to continue, and after several more alarms the Eagle touched down safely on the Moon.
Very insightful talk by Robert Wills, engineer at Cisco. No only does it give an insight in how to land a Lunar Lander on the moon, it also provides a thorough analysis of the hardware and software design principles that saved the mission.