Orbital blames rocket engine failure for launchpad blast

November 5, 2014
This still image from NASA video shows an Orbital Sciences Corporation unmanned spacecraft exploding on October 28, 2014 at Wallops Island, Virginia, six seconds after launch on a resupply mission to the International Space Station

Orbital Sciences Corporation said Wednesday a preliminary probe into last month's unmanned rocket blast shows an engine failure was to blame for the explosion shortly after liftoff from Wallops Island, Virginia.

The type of engines used to power the Antares rocket were a pair of decades-old Ukrainian-designed AJ-26s, that were refurbished by Aerojet Rocketdyne.

"Preliminary evidence and analysis conducted to date points to a probable turbopump-related in one of the two Aerojet Rocketdyne AJ26 stage one main engines," Orbital said in a statement.

"As a result, the use of these engines for the Antares vehicle likely will be discontinued."

Instead, the company vowed to speed up "an upgrade of the Antares medium-class launcher's main propulsion system."

Orbital said it would be able to maintain its contract with NASA and "all remaining cargo will be delivered to the International Space Station (ISS) by the end of 2016" with no extra costs and "only minor adjustments" to the launch schedule in the near future.

On the evening of October 28, an unmanned Antares rocket that held the Cygnus cargo ship packed with thousands of pounds of gear for the astronauts exploded seconds after liftoff.

The company said after the accident that a suspected rocket led a control operator to detonate the in order to prevent damage to people in the area.

The blast cost Orbital at least $200 million in lost equipment and supplies.

The accident was the first catastrophic failure since private companies began supplying the International Space Station in 2010.

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5 / 5 (1) Nov 05, 2014
So it is clear that using refurbished, sub-standard engines is not the way to go when trying to compete in the private industry space launch services market. A $200 million loss is not peanuts - another couple of those and Orbital Sciences will be out of the game. Go, SpaceX!
not rated yet Nov 05, 2014
The turbo-pump with its cutting edge (1960's) unique Russian metallurgy is certainly due for a re-examination. Especially if they are 1960's fabricated components. The oxygen rich pre-burners that power the turbo-pumps are like a thermic lance on the pump-drive turbine.
(See Wiki NK33 rocket engine, on which the AJ26 was based, for scary but impressive details.)
5 / 5 (1) Nov 06, 2014
For the companies in the business of refurbishing these millennia-old cold-war artifacts, I don't imagine business is great right now.

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