Orbital Sciences to Replace Suspect Rocket Engine After Antares Explosion

Orbital Sciences' Antares rocket exploded mid-air shortly after liftoff on Oct. 28, 2014. (PHOTO CREDIT: NASA/Joel Kowsky)
Orbital Sciences’ Antares rocket exploded mid-air shortly after liftoff on Oct. 28, 2014. (PHOTO CREDIT: NASA/Joel Kowsky)

The commercial spaceflight company Orbital Sciences said today (Nov. 5) that the investigation into the explosion of its Antares rocket last week is eyeing the booster’s first-stage engines, which were originally built in the 1960s by the Soviet Union at the height of the space race. In a call with investors, an Orbital Sciences representative said the company will likely retire the engines, with the goal of replacing them by 2016.

The Orbital Sciences Corporation’s Antares rocket exploded just after launch on Oct. 28, destroying the company’s unmanned Cygnus spacecraft, which was carrying thousands of pounds of supplies for the International Space Station under a $1.9 billion contract with NASA. No one was injured in the accident.

It now appears that the mishap may be traceable to Antares’ AJ26 first-stage engines, company officials said.

“While still preliminary and subject to change, the current evidence strongly suggests that one of the two AJ26 main engines that powered Antares’ first stage failed about 15 seconds after ignition,” Orbital president and CEO David Thompson said during a conference call today. “At this time, we believe the failure likely originated in, or directly affected, the turbopump machinery of this engine, but I want to stress that more analysis will be required to confirm that this finding is correct.”

Orbital has recently come under fire for its use of the AJ26 engines. The parts were originally built for the Soviet Union’s ill-fated N-1 moon rocket more than 40 years ago, then later refurbished and renamed by the American company Aerojet (now Aerojet-Rocketdyne).

In light of the recent explosion, Orbital now plans on flying missions to the space station using a different kind of rocket and moving up the replacement of the AJ26, Thompson said.

Orbital Sciences had been planning to replace the AJ26 engines with different engines for launch by 2017, but now that upgrade is expected to occur by 2016, Thompson said.

“We will likely discontinue the use of the AJ26 rocket engines that had been used on the first five Antares launch vehicles unless and until those engines can be conclusively shown to be flightworthy,” Thompson said.

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SOURCE: Discovery News
Space.com
Miriam Kramer

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