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More Details for 1968-07-13

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ASPO Manager George M. Low wrote to Grumman President Llewellyn J. Evans to call his attention to the problem of continued propellant leaks in the LM.

"In spite of all of our efforts, last summer" (i.e., with the extensive plumbing rework done on LM-1 after its delivery to Florida), Low said, technicians at KSC found a leak on one of the lines on LM-3, even though no leaks had been observed during checkout at Bethpage. Investigating the problem, Low had learned that Grumman had made some propellant-system design changes that had led to installation of four-bolt flanges with single teflon O-ring seals - despite the fact that during the preceding summer NASA and Grumman had jointly agreed not to use this joint on the LM vehicle. This most recent problem, said Low, again points up the importance of strictest control of all design changes in the spacecraft. Because of the need for maintaining a lunar-configured LM as a design baseline, all spacecraft design changes had to be carried through the Apollo Configuration Control Board before implementation.