SpaceX aborts launch after engine snag

​Miami: SpaceX aborted its planned Dragon cargo launch to the International Space Station just seconds before liftoff on Saturday due to a "slightly odd" technical issue with the Falcon 9 rocket engine. The delay was taken "out of an abundance of caution," a SpaceX spokesman said, and came a day after engineers discovered a small helium leak in the engine's second stage.

"All systems go, except the movement trace of an upper stage engine steering hydraulic piston was slightly odd," SpaceX chief executive officer Elon Musk said on Twitter after the launch was scrubbed. "Standing down to investigate," he added. "If this is the only issue, flight would be fine, but need to make sure that it isn't symptomatic of a more significant upstream root cause."

The next launch attempt is scheduled for 9:38 am Sunday (local time). In the meantime, engineers plan to "take a closer look at the position of the second stage engine nozzle," SpaceX said.

The Hawthorne, California-based company has endured two costly disasters in the past two years -- a launchpad blast that destroyed a rocket and its satellite payload in September, and a June 2015 explosion after liftoff that obliterated a Dragon cargo ship packed with provisions bound for the space station. SpaceX has since made one successful return to flight in January of this year, from Vandenberg Air Force base in California.

But this flight is particularly significant because of its starting point at Cape Canaveral's launchpad 39A, which was used for the pioneering Apollo missions to the Moon in the 1960s and 1970s, and later for the space shuttle launches from 1981 to 2011.