SpaceX's Falcon 9 T-0 Launch Abort

[pokerfan]

From the Planetary Society:

The launch of SpaceX's Falcon 9 rocket and Dragon capsule was aborted last night a half-second before liftoff, due to abnormally high pressure readings in engine number five. SpaceX technicians will head to the launch pad today to visually inspect the engine today before deciding on a course of action.

Depending on the severity of the issue, options range from adjusting the acceptable launch pressure constraints to all-out replacement of the engine. SpaceX has a spare engine onsite at Cape Canaveral, but installing it would likely cause further delays. The next available launch window is Tuesday, May 22 at 3:44AM EDT (7:22 UTC), and another opportunity occurs on May 23. Launch windows for the COTS 2 demonstration flight are very narrow due to the amount of propellant the Dragon spacecraft requires to perform its demonstration maneuvers when it reaches the International Space Station.

Aborting the launch of a liquid-fueled rocket moments before liftoff is dramatic, but a routine procedure when sensors on the vehicle detect an issue. The space shuttle, in fact, went through similar launch aborts a handful of times throughout the program. Here's a video montage of a few; notice how the shuttle stack continues to sway after the main engines cutoff, creating an unnerving situation for the astronauts inside the vehicle.

http://www.planetary.org/blogs/guest-blogs/jason-davis/spacexs-falcon-9-aborts.html

Elon Musk ?@elonmusk (about an hour before the launch attempt):
Whatever happens today, we could not have done it without @NASA, but errors are ours alone and me most of all.

[TupperHappy]

1. Better an abort on the ground

... than a massive fireball thirty seconds into launch.

Hopefully they can fix in time for the Tuesday launch window.

[backscatter712]

2. From what I read, the Falcon's computer detected high pressure in one of its engines.

Worst case scenario is that they swap out an engine and try again on Tuesday.

But I've also read that the engineers may have concluded that the red-line programmed into the computer for that particular sensor was too conservative, and that they might solve the problem simply by updating the software.