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SpaceX working to fix Dragon capsule’s thrusters
Question of the Day
CAPE CANAVERAL, FLA. (AP) - A commercial craft carrying a ton of supplies for the International Space Station ran into thruster trouble shortly after liftoff Friday, and flight controllers scrambled to fix the problem.
SpaceX founder Elon Musk said three of the four sets of thrusters on the company's unmanned Dragon capsule did not immediately kick in, delaying the release of twin solar panels for two hours.
The company said in a statement that a fuel valve was at fault, and that two sets of thrusters were needed before the Dragon could begin the maneuvers needed to get to the space station.
But more than four hours after the launch, there was no word on whether any more thrusters were working. And as the afternoon wore on, Saturday's planned rendezvous with the space station became less likely. SpaceX and NASA hastily called a news conference for mid-afternoon.
The capsule is equipped with 18 thrusters, divided into four sets, and can maneuver adequately even if they aren't all working.
The problem cropped up following Dragon's separation from the rocket upper stage, nine minutes into the flight. The liftoff was right on time and appeared to go flawlessly; the previous Falcon launch in October suffered a single engine failure that resulted in the loss of a communications satellite that was hitching a ride on the rocket.
This is the first major trouble to strike a Dragon in orbit. Two similar capsules, launched last year, had no problem getting to the orbiting lab.
More than 1 ton of space station supplies is aboard this Dragon, including some much-needed equipment for air purifiers.
NASA's Mission Control informed the six-man crew that the Dragon would be passing directly beneath the space station in the afternoon, and urged them to keep a lookout.
"Maybe you can ask it to breathe a little fire as we go over top," commander Kevin Ford jokingly told controllers in Houston.
SpaceX has a $1.6 billion contract with NASA for 12 deliveries to restock the space station, and hopes the venture will lead to transporting astronauts there in a few years. A company-sponsored demo mission kicked everything off last May.
Launch controllers applauded and gave high-fives to one another, once the spacecraft safely reached orbit. The successful separation of the Dragon from the rocket was broadcast live on NASA TV; on-board cameras provided the unique views nine minutes into the flight.
Then the trouble struck, and the coverage ended.
The California-based SpaceX, run by the billionaire who helped create PayPal, is in charge of the flight, until it gets near the space station. Then NASA calls the shots.
The space station was orbiting 250 miles above the Atlantic, just off the New England coast, when the Falcon soared. Astronauts are to use a hefty robot arm to draw the Dragon in and dock it to the station.
SpaceX tucked fresh fruit into the Dragon for the station residents; the apples and other treats are straight from the orchard of an employee's family. Also on board: 640 seeds of a flowering weed used for research, mouse stems cells, protein crystals, astronaut meals and clothing, trash bags, air-purifying devices, computer parts and other gear.
NASA's deputy administrator, Lori Garver, said using commercial providers is more efficient for the space agency. It's part of a long-term program, she noted, that has NASA spending less money on low-Earth orbit and investing more in deep-space missions. That's one reason why the space shuttles were retired in 2011 after the station was completed.
The goal is to have SpaceX, or Space Exploration Technologies Corp., and other private firms take over the job of ferrying astronauts to and from the space station in the next few years.
SpaceX _ so far the leader of the pack _ is aiming for a manned Dragon flight by 2015.
Competitor Orbital Sciences Corp. has yet to get off its Virginia launch pad. The company plans to launch a free-flying test of its Antares rocket and Cygnus supply ship in April, followed by a demo run to the space station in early summer. Then the so-called operational supply runs can begin.
Russia, Japan and Europe regularly make station deliveries as well, and Russia is the only option for astronaut rides. But only the Dragon is designed to bring back substantial amounts of research and used merchandise.
This Dragon is scheduled to spend more than three weeks at the space station before being cut loose by the crew on March 25. It will parachute into the Pacific with more than a ton of medical samples, plant and cell specimens, Japanese fish and old machinery, and used spacewalking gloves and other items.
SpaceX plans to launch its next Dragon to the station in late fall.
More than 2,000 guests jammed the Cape Canaveral launch site Friday morning to watch the Falcon take flight. It wasn't much of a show because of all the clouds.
By Tom Harris and Madhav Khandekar
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