Surveyor 6 was the first spacecraft planned to liftoff from the Moon's surface. The rocket explodes 51 seconds after liftoff. It controlled the entire rocket from just before liftoff until battery depletion. The Block 1 will use 5-segment solid rocket boosters producing of thrust at liftoff. The Irwin covers were not postmarked, either at liftoff or splashdown. At liftoff, a propellant fill umbilical became snared with its release lanyard. This EVA is mostly just preparations for the lunar liftoff, this includes jettisoning hardware. Timing sequence referencing in ignition is critical for a successful liftoff and ascent flight. Rockets under 125g propellant and 1500g liftoff mass are exempt from most requirements. Impact with the ground occurred 30 seconds after liftoff. It was nearing thirty hours since liftoff. The AS-510 mission (Apollo 15) had a liftoff thrust of . A few minutes after liftoff, it spectacularly exploded, lighting up the night sky. A few minutes after liftoff, it exploded spectacularly, lighting up the night sky. Gross liftoff mass is at a lift-off thrust of .