Ares 1-X countdown timeline

NOTE: All data assumes an on-time launch at 8 a.m. EDT. L-0 Day October 27, 2009 T-00:00 (8:00:00 a.m. EDT)....SRM ignition and hold-down bolts fireT+00:00.225 (8:00:00.225 a.m. EDT)....Liftoff; Pyrotechnics fire to release umbilicalsT+00:06 (8:00:06 a.m. EDT)....Clear launch tower; Roll Control System activation;Start 90-degree rollT+00:20 (8:00:20 a.m. EDT)....RoCS turned off for 1