Update: Launch Abort of Falcon 9 Rocket and Dragon Spacecraft
SpaceX has issued a statement with additional details on the aborted 19 May 2012 launch of the Falcon 9 Rocket and Dragon spacecraft.
In an e-mail sent 19 May, the company said, "(Today's) launch was aborted when the flight computer detected slightly high pressure in the engine 5 combustion chamber. We have discovered root cause and repairs are underway."
It continued, "During rigorous inspections of the engine, SpaceX engineers discovered a faulty check valve on the Merlin engine. We are now in the process of replacing the failed valve. Those repairs should be complete tonight. We will continue to review data on Sunday. If things look good, we will be ready to attempt to launch on Tuesday, May 22nd at 3:44 AM Eastern."
This launch attempt is the first SpaceX unmanned cargo mission bound for the International Space Station (ISS).