NASA?s SpaceX CRS-29: Countdown and Ascent Milestones
Here?s a full look at the countdown and ascent milestones for tonight?s launch, targeted for 8:28 EST from Launch Complex 39A at NASA?s Kennedy Space Center in Florida. All times are approximate: COUNTDOWN? Hr/Min/Sec Event ? 00:38:00???????????? SpaceX Launch Director verifies go for propellant load ? 00:35:00???????????? RP-1 (rocket grade kerosene) loading begins ? 00:35:00???????????? 1st stage LOX (liquid oxygen) loading begins ? 00:16:00???????????? 2nd stage LOX loading begins ? 00:07:00???????????? Falcon 9 begins pre-launch engine chill ? 00:05:00???????????? Dragon transitions to internal power ? 00:01:00???????????? Command flight computer to begin final prelaunch checks ? 00:01:00???????????? Propellant tanks pressurize for flight ? 00:00:45???????????? SpaceX Launch Director verifies go for launch ? 00:00:03???????????? Engine controller commands engine ignition sequence start ? 00:00:00???????????? Falcon 9 liftoff ? LAUNCH, LANDING, AND DRAGON DEPLOYMENT Hr/Min/Sec?????Event -00:01:12 Max Q (moment of peak mechanical stress on the rocket) -00:02:17 1st stage main engine cutoff (MECO) -00:02:21 1st and 2nd stages separate -00:02:28 2nd stage engine starts -00:02:34 Boostback Burn Starts -00:03:28 Boostback Burn Ends -00:06:10 1st stage entry burn starts -00:06:22 1st stage entry burn ends -00:07:19 1st stage landing burn starts -00:07:36 1st stage landing -00:08:33 2nd stage engine cutoff (SECO-1)
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