L-0 Day	October 28, 2009
T-XX:XX:XX (12:30 a.m. EDT)....Call to stations T-06:40:00 (1:00 a.m. EDT)....Start countdown T-06:25:00 (1:15 a.m. EDT)....Ares 1-X power up preps T-06:15:00 (1:25 a.m. EDT)....Begin Ares 1-X power up T-04:50:00 (2:50 a.m. EDT)....Start aligning inertial navigation unit T-04:10:00 (3:30 a.m. EDT)....Terminate First Stage Avionics Module and Upper Stage Simulator purges; Disconnect FSAM and USS ducts T-03:40:00 (4:00 a.m. EDT)....Launch Authority Team on console in Firing Room 1; Begin Range hold-fire checks T-02:50:00 (4:50 a.m. EDT)....Power up and test C-band beacon transponder T-02:15:00 (5:25 a.m. EDT)....Disconnect Vehicle Stabilization System; Begin retracting Rotating Service Structure; Start inertial navigation unit testing T-02:10:00 (5:30 a.m. EDT)....Auxiliary Power Unit bite test T-01:45:00 (5:55 a.m. EDT)....Begin pad securing T-01:10:00 (6:30 a.m. EDT)....Remove 5-hole probe cover T-00:55:00 (6:45 a.m. EDT)....Begin final alignment of inertial navigation unit T-00:43:00 (6:57 a.m. EDT)....Activate Flight Termination System T-00:30:00 (7:10 a.m. EDT)....Clear launch pad personnel; First stage Pyro Initiator Controller test; Activate aft skirt purge; Turn on Development Flight Instrumentation T-00:20:00 (7:20 a.m. EDT)....Flight Termination System closed-loop test T-00:04:00 (7:36 a.m. EDT)....Enter 20-minute built-in hold; Power up rocket video transmitters; Verify launch weather T-00:04:00 (7:41 a.m. EDT)....Start launch recorders; Configure sequencer for launch T-00:04:00 (7:46 a.m. EDT)....Poll Launch Authority Team for "go/no go" T-00:04:00 (7:56 a.m. EDT)....T-minus 4 minutes and counting T-00:03:30 (7:56:30 a.m. EDT)....Arm Flight Termination System T-00:03:25 (7:56:35 a.m. EDT)....Arm Solid Rocket Motor T-00:03:00 (7:57:00 a.m. EDT)....Turn off avionics cooling fans T-00:01:59 (7:58:01 a.m. EDT)....Transfer to internal power T-00:01:54 (7:58:06 a.m. EDT)....Start instrumentation data recorder T-00:01:40 (7:58:20 a.m. EDT)....Enable flight control system T-00:01:20 (7:58:40 a.m. EDT)....Synchronize DFI and OFI data streams T-00:00:50 (7:59:10 a.m. EDT)....Deactivate SRM joint heaters T-00:00:35 (7:59:25 a.m. EDT)....Set FTINU to navigation mode T-00:00:28 (7:59:32 a.m. EDT)....Start APU T-00:00:21 (7:59:39 a.m. EDT)....SRM gimbal test T-00:00:16 (7:59:44 a.m. EDT)....Activate sound suppression water T-00:00:00 (8:00:00 a.m. EDT)....SRM ignition and liftoff

Data Source: NASA