ClockTime Tplus What minutes seconds Vi_mph 10:06:00 PM 00:00 STS-97 liftoff! 0 0 10:06:10 PM 00:10 Start roll program 0 10 920 10:06:18 PM 00:18 End roll program 0 18 1016 10:06:39 PM 00:39 Main engine throttle down 0 39 1330 10:06:49 PM 00:49 Max Q (695 psf) 0 49 1459 10:06:53 PM 00:53 Main engine throttle up 0 53 1507 10:08:04 PM 02:04 SRB separation 2 4 3648 10:08:14 PM 02:14 Start OMS assist rocket firing 2 14 3750 10:08:37 PM 02:37 Last pre-TAL RTLS 2 37 3955 10:08:38 PM 02:38 First two-engine TAL 2 38 3955 10:09:56 PM 03:56 End OMS assist rocket firing 3 56 5455 10:09:51 PM 03:51 Negative return 3 51 5523 10:10:57 PM 04:57 Last pre-ATO TAL 4 57 6955 10:10:58 PM 04:58 Press to ATO 4 58 6955 10:11:50 PM 05:50 Single engine Zaragoza 5 50 9000 10:12:22 PM 06:22 Press to MECO 6 22 10500 10:13:07 PM 07:07 Single engine MECO 7 7 12818 10:13:21 PM 07:21 3G Limiting 7 21 13636 10:14:24 PM 08:24 MECO 8 24 17659