STS-51-F Abort-to-Orbit (1985)
STS-51-F was the only Space Shuttle mission to execute an Abort-to-Orbit after sensor failures triggered a main engine shutdown during the 1985 Challenger launch.
summary is enough A concise historical overview that rewards a quick read for spaceflight enthusiasts interested in rare shuttle abort procedures and mission trivia.
summary
Space Shuttle Challenger's STS-51-F mission in 1985 is notable for executing the program's only successful Abort-to-Orbit after multiple engine sensor failures caused a premature shutdown of its center main engine. Quick thinking by a booster systems engineer prevented cascading shutdowns that could have resulted in the loss of the vehicle. The mission also famously carried competing Coca-Cola and Pepsi zero-gravity dispensers, an infrared telescope, and even baby dinosaur fossils. Despite lower-than-planned orbital altitudes from the abort, the Spacelab 2 scientific objectives were largely achieved.
key points
- Challenger experienced sensor failures in its center main engine 3.5 minutes into launch, forcing the only Abort-to-Orbit in Space Shuttle history.
- Engineer Jenny M. Howard prevented a potential catastrophic multi-engine shutdown by advising the crew to inhibit automatic sensor aborts.
- The mission featured unusual payloads, including Cola Wars beverage dispensers and the first dinosaur fossils sent to space.
who should read it
Aerospace enthusiasts and readers interested in the technical history and near-disasters of the NASA Space Shuttle program.
discussion positive
consensus
Commenters focus on the extreme risks of Space Shuttle abort modes, particularly the terrifying Return to Launch Site maneuver, and how historical disasters often stemmed from ignored warning signs.
> Booster Systems Engineer Jenny M. Howard acted quickly to recommend that the crew inhibit any further automatic RS-25 shutdowns based on readings from the remaining sensors,[6] preventing the potential shutdown of a second engine and a possible abort mode that may have resulted in the loss of crew and vehicle (LOCV)
Incredible that human action during ascent (when everything is usually automated) potentially saved a crew. One of probably dozens of cases, is my guess.
STS still has the record for most astronauts killed. I don't believe we will surpass that grim record until Starship starts …
It emphasizes the critical, life-saving human intervention by engineer Jenny M. Howard during ascent when automation usually rules.
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