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Posted March 20, 2007The abort that occurred a few minutes before T-0 was triggered by our ground control software. It commanded a switchover of range telemetry from landline to radio, which took place correctly, however, because of the hardware involved, this transition takes a few hundred milliseconds. Before it had time to complete, our system verification software examined state and aborted.Our simulations done beforehand all passed, because the simulator did not account for a hardware driven delay in the transition. We considered putting the vehicle into a safe state yesterday and updating the ground control software to make the very minor fix needed, but the safer course of action was to stand down.Yesterday afternoon and evening (Kwaj time), our launch team updated the software to address the timing issue and verified that there were no similar problems elsewhere. We ran the software through several simulated countdowns and then once again with the rocket and range in the loop.All systems are now go for launch with T-0 at 4pm California time today (Tues).--Elon--
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2210 GMT (6:10 p.m. EDT)SpaceX tells reporters that launch remains on schedule for 2300 GMT.
2215 GMT (6:15 p.m. EDT)Now SpaceX indicates the launch time has moved to 2330 GMT (7:30 p.m. EDT).(Spaceflight Now)
2220 GMT (6:20 p.m. EDT)"We are in a hold right now. We've got a potential RF (radio frequency) compatibility issue with the payload, which we're working through. I anticipate we will come out of the hold in about 10 or 15 minutes and get back on track," says Gwynne Shotwell, SpaceX vice president of business development.Weather conditions are acceptable at the launch site today, she added.
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