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[i]At touchdown, the lunar module was located partially inside a small crater with the rim of the crater directly underneath the descent engine skirt. The descent engine skirt buckled during landing. This is accounted for in the touchdown dynamic analysis, and was expected as the skirt length had been extended 10 inches over that of previous vehicles. This buckling was noted by the crew and confirmed by photographs of the damaged skirt. The crew reported that there was a gap between the exit plane of the skirt and the lunar surface, indicating that buckling was probably caused by a buildup of pressure inside the nozzle due to proximity to the lunar surface, and not due entirely to contact of the nozzle skirt with the lunar surface. The crew also reported that the buckling seemed to be uniform around the skirt periphery and that the exit plane height above the surface was uniform.[/i]
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