STS-51-F Abort-to-Orbit (1985)

STS-51-F, the 19th Space Shuttle mission, launched on July 29, 1985, with the primary payload being the Spacelab 2 laboratory module, though it also carried notable experiments including a carbonated beverage dispenser evaluation and an infrared telescope. During launch, Engine 1 experienced multiple sensor failures, forcing the shuttle to perform an "Abort to Orbit" emergency procedure—the only Shuttle mission ever to execute an abort after launching—resulting in a slightly lower orbital altitude for the remainder of the eight-day mission.