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[i]The [URL=https://www.hq.nasa.gov/alsj/CSM06_Command_Module_Overview_pp39-52.pdf]inner structure[/URL] is of aluminum sandwich construction which consists of a welded aluminum inner skin, adhesively bonded aluminum honey comb core and outer face sheet. The thickness of the honeycomb varies from about 1.5 inches at the base to about 0.25 inch at the forward access tunnel. This inner structure — basically the crew compartment — is the part of the module that is pressurized and contains an atmosphere. The outer structure is the heat shield and is made of stainless steel brazed honeycomb brazed be between steel alloy face sheets. It varies in thickness from 0.5 inch to 2.5 inches. Part of the area between the inner and outer shells is filled with a layer of fibrous insulation as additional heat protection.[/i]
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