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The NASA manager overseeing development of Boeing and SpaceX's commercial crew ferry ships says the space agency has approved SpaceX's proposal to strap in astronauts atop Falcon 9 rockets, then fuel the launchers in the final hour of the countdown as the company does for its uncrewed missions.
The "load-and-go" procedure has become standard for SpaceX's satellite launches, in which an automatic countdown sequencer commands chilled kerosene and cryogenic liquid oxygen to flow into the Falcon 9 rocket in the final minutes before liftoff.
[...] SpaceX's "load-and-go" procedure raised concerns after a Falcon 9 rocket exploded on its launch pad at Cape Canaveral in September 2016. The fiery accident occurred in the final minutes of a countdown while propellants were flowing into the rocket before a hold-down engine firing, destroying the launcher and an Israeli-owned communications satellite on-board.
Officials from SpaceX said the Crew Dragon's escape system, comprising a set of high-thrust SuperDraco engines around the circumference of the capsule, would be quick enough to push the spacecraft and its crew away from such an explosion during fueling.
The abort thrusters will be activated and armed before fueling of the Falcon 9 during crewed launches.
SpaceX plans an unmanned, in-flight abort test prior to the first crewed flight, which is tentatively scheduled for April 2019.
(Score: 2) by VLM on Tuesday August 14 2018, @12:38PM
NASA is political and you're missing the CYA component. At the congressional hearings, "it was loaded and ready to go" will sell better after a pre-launch accident.
Also really old timers or hard core space dudes will remember Apollo 1 and its fire and more importantly its investigation. They're worried the fueling process will start a fire and cook the crew in some unanticipated incident, not in an anticipated incident. You can't cook the crew in a completely unanticipated fueling accident if the crew is sleeping in their beds 20 miles away while fueling, and in the congressional investigation its hard to hand wave away sound bites about alternative procedures no matter how stupid or on average more dangerous, being 0% dangerous for the isolated situation where a crew gets cooked.
A fueling accident is how the procedure will get rolled back, even if the rollback is on average on a system wide basis more dangerous.