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1967, "Saturn V / Apollo Requirements for S-1C Emergency Detection System, SA-503" (Boeing, 111pp.,

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1967,  Saturn V / Apollo Requirements for S-1C Emergency Detection System, SA-503  (Boeing, 111pp.,
1967, "Saturn V / Apollo Requirements for S-1C Emergency Detection System, SA-503" (Boeing, 111pp., card) "This report summarizes the results of a study initiated on February 2, 1967, to evaluate and recommend feasibility changes to the Saturn V / Apollo vehicle that improve crew safety. The changes considered are to provide improved malfunction flight capability during S-1C burn and to allow safe abort by the Emergency Detection System (EDS) ... EDS effectiveness after malfunction during S-1C flight was identified as a problem in November, 1966. Since that time, two significant actions have been initiated by MSFC including a) The S-1C stage flight control system for the 501 vehicle was modified in March, 1967, to provide improved bending mode gain margin, increased dynamic gains and new switch times to maintain the benefit of the increased gains over a longer flight time. This modification improves malfunction flight capability for loss of a single engine thrust or actuator deflected hardcover. The change is being implemented on vehicles through SA-504 and b) A test program has begun with the stage contractors to determine the tension capability at critical joints of the launch vehicle...". An important, early document.