Amendment 1 - Attachment 4 Milestone Payment Schedule.xlsx

This is a Milestone Payment Schedule template for the VC3 Vacuum Chamber project under solicitation 80GRC026R0011 issued by NASA Glenn Research Center. The schedule outlines 18 distinct milestones spanning the full lifecycle of a custom thermal vacuum chamber system, including chamber shell, thermal shroud, and thermal conditioning unit (TCU). The milestones progress sequentially from project initiation through design phases (50%, 90%, and final design completion), material acquisition, fabrication of major components, procurement activities, shop acceptance testing, onsite installation, acceptance testing of individual components, punchlist completion, and delivery of as-built documentation and operation manuals. A critical constraint requires that onsite installation and acceptance testing activities must collectively represent a minimum of 35% of the total contract value across milestones 11 through 17. The template includes fields for milestone amounts, period completion percentages and dollar values, cumulative completion metrics, and comments, though all values currently display as zero dollars pending contract award and negotiation. The schedule also incorporates a contingency milestone (VC3 18) for standby or storage costs that may be required during project execution.