SpaceX halts rocket launch 10 seconds before planned liftoff

A SpaceX Falcon 9 rocket is prepared for another launch attempt for a supply mission to the International Space Station from historic launch pad 39A at the Kennedy Space Center in Cape Canaveral, Florida, U.S., February 18, 2017. Launch is scheduled for February 19. REUTERS/Joe Skipper     TPX IMAGES OF THE DAY



Elon Musk’s Space Exploration Technologies Corp. halted the launch of its second rocket in as many months on Saturday, about 10 seconds before its scheduled liftoff.
“All systems go, except the movement trace of an upper stage engine steering hydraulic piston was slightly odd. Standing down to investigate,” Musk said in a Twitter post.
The rocket, which was set to ferry supplies destined for the International Space Station, was investigated Friday for what Musk called a “very small” leak in the upper stage before it was deemed adequate to fly.
In a second tweet on Saturday, Musk said the “flight would be fine” if there are no other issues, though SpaceX needs “to make sure that it isn’t symptomatic of a more significant upstream root cause.”
The company will “take a closer look at an engine actuator on the second stage,” SpaceX spokesman John Taylor said in an e-mail. The launch at the Kennedy Space Center in Florida has been rescheduled for Sunday at 9:38 a.m., he said.
Saturday’s launch would have been the company’s second since a fireball destroyed a different rocket and its payload on a Florida launch pad in September. SpaceX, which completed just eight missions in 2016, successfully returned to the skies last month with the delivery of 10 communications satellites into orbit.
SpaceX has contracts with the National Aeronautics and Space Administration valued at $4.2 billion to resupply the Space Station using its unmanned Dragon spacecraft and ultimately to ferry astronauts to the station from the U.S. with a version of Dragon that’s capable of carrying crews. The Government Accountability Office said Thursday in a report that SpaceX and competitor Boeing Co. won’t be certified this year to send astronauts to space and may be delayed into 2019 because of potential safety hazards.

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