Flown checklist carried on board the Shuttle Challenger mission STS-51-F from July 29–August 6, 1985. Checklist measures 5.5 x 8.25 and is bound together by two original metal rings, with 49 tabs along the right edges of the page. Front is labeled “PDRS Ops Checklist STS-51-F,” is stamp dated October 2, 1985, and is signed on the cover in black felt tip by Gordon Fullerton. There are several highlighted lines inside the manual. PDRS stands for Payload Deployment and Retrieval System and covers all the components used to carry and remove payloads from the shuttle cargo bay. In fine condition. Pre-certified Steve Zarelli and RR Auction COA.