Encyclopedia Astronautica
1963.10.16 - Apollo CM humidity study


Because of an electrical equipment failure on Mercury MA-9, North American began a CM humidity study.

The company found in the crew compartment major spacecraft systems which were not designed for operation in the presence of corrosive moisture. (The environmental control system did not guarantee complete humidity control.) Investigators also examined in minute detail all electrical electronic components. North American was considering design changes that would protect all components from moisture.

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