ASTP Countdown Planning Charts: CDDT Wet and Dry, and Launch Countdown for Spacecraft 111

Three oversized double-page bar-chart timeline sheets from an internal launch-operations planning binder. Two, headed “ASTP CDDT Wet and Dry” and dated 5 June 1974 (page 00-101, and a continuation marked “Sheet 2 of 3”), lay out the Countdown Demonstration Test hour by hour — the full dress-rehearsal countdown run in both a fueled (“wet”) and unfueled (“dry”) configuration ahead of flight, tracking tasks such as helium servicing, cryogenic tanking and detanking, hatch closeout, and crew ingress against a countdown clock spanning roughly T-133 hours to T-0 and into hold/recycle branches, with rows grouped into General Activity, Test Setups, and BCRD tiers.

The third sheet, headed “Launch Countdown S/C 111” (page 00-103), is the actual flight countdown plan for Command/Service Module 111 — the CSM that flew the Apollo-Soyuz Test Project, docking with Soyuz 19 in July 1975 in the final flight of an Apollo spacecraft.

All three sheets are heavily worked in red ink with crossed-out and rewritten line items, added steps, and margin notes, consistent with an engineer’s working copy rather than an archival reference set; a faint pencil page sequence in the corner of the third sheet suggests the pages were pulled from a larger personal binder. No accompanying folder or provenance came with them.