To enhance its competitive edge in producing highly contamination-sensitive space systems, TRW has recently designed and constructed a large spacecraft assembly and test facility that is fully cleanroom compatible. Features of this facility include a large assembly and test area and a smaller support room that have HEPA-filtered vertical flow, dedicated staging areas for garment application, storage, and equipment preparation, and an automated cleanroom monitoring system (CRMS). A description of the design, construction, and certification process is given. Operational data from the CRMS and lessons learned are also presented.

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