SATURN V's SECOND FLIGHT, A GIANT POGO STICK.
Flight Operations Plan, AS-502. Houston, TX: NASA/MSC, September 20, 1966. 62 pp. 10½ by 8 inches. Card stock covers, tabbed, punched with ring binders. Internal distribution secretarial inscription "C.C. Kraft" (Flight Operations Director) on the front cover.
Covers all aspects and objectives of the unmanned second flight of Saturn V. Describes flight phases of launch, earth parking orbit, high altitude orbit, planned SPS burns, and Command Module reentry. Plans for flight control, network support, abort and recovery efforts are addressed. Known as Apollo 6, the Saturn's first stage experienced a massive "pogo effect" which was a severe vibration along the longitudinal axis of the rocket caused by thrust fluctuations with the F-1 engines. Later, the second stage had two of the five J-2 engines shut down prematurely. This required a longer burn time of the remaining 3 engines to achieve earth orbit. Once in orbit, the third stage failed to restart and thus could not send the CSM into a higher orbit. The CSM's own engine was used to salvage parts of the mission's objectives. Flight issues such as these are addressed in the abort section of this document.