SpaceX says human error doomed rocket

By Brian Berger

Space News staff writer

updated 2:57 p.m. ET April 6, 2006

COLORADO SPRINGS, Colo. - The Falcon 1 rocket was leaking fuel four minutes prior to liftoff, causing the first stage engine to catch fire about 25 seconds into its rocket’s much shorter than expected maiden flight, dooming the rocket and its payload.

Elon Musk, chairman and chief executive officer of El Segundo, Calif.-based Space Exploration Technologies (SpaceX) said the cause of the leak was human error, not a design flaw.

“All current analysis shows that the nature of the problem was a pad processing error the day before the launch,” Musk said during an April 5 presentation at the National Space Symposium here.

Musk said the mistake was made by “one of our most experienced pad technicians” but declined to provide further details on the error, saying he did not want to get ahead of an ongoing launch failure investigation SpaceX is conducting with the Pentagon, its customer for the mission.

Sources familiar with the investigation said the pad technician had been working on the rocket’s avionics the night before launch and failed to tighten a tiny fuel pipe fitting that had been loosened in order to perform the avionics work.

In the final minutes before the March 24 liftoff, Falcon 1 flight controllers saw no pressurization drop that would have been an indication of a problem onboard the vehicle.

“If we had been looking at the right data stream at the right time we would have caught it,” Musk said.

Instead, the rocket was launched. About 25 seconds into the flight, a fire broke out around the top of the main engine, damaging the first-stage helium pneumatic system used to pressurize the rocket’s fuel tanks. Four seconds later, once the pressure dropped, the Falcon 1’s Merlin engine shut down.

The rocket subsequently crashed into a reef not one kilometer from SpaceX’s Pacific Ocean island launch facility in the Kwajalein Atoll. The rocket’s payload, a small experimental satellite called FalconSat-2 that was built by cadets at the U.S. Air Force Academy, crashed through the roof of an unoccupied storage shed on the island and landed next to the shipping container used to transport it to Kwajalein.

Musk said he views the Falcon 1 launch as a “partial success” because the primary objective of the mission was not to put the $700,000 satellite in orbit but to gain flight data on the rocket and show that it could be made ready to launch in a couple hours or less.

“We obviously cannot say it was a complete success. That would be ludicrous. We also cannot say it was a complete failure. That would be just as inaccurate,” Musk said.

The U.S. Air Force and the Defense Advanced Research Projects Agency paid $8 million for the mission in order to evaluate the Falcon 1’s suitability as highly responsive launcher. Musk said with additional work, a Falcon 1 could be prepared for launch in under an hour.

Musk said none of his customers have given any indication that they intend to flee in light of the Falcon 1’s unsuccessful debut, and many have gone out of their way to show their continued support.

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