STS-133 Countdown Timeline
The launch window is roughly 10 minutes long. To maximize ascent performance, NASA targets the middle of the window. A final hold in the countdown at the T-minus nine-minute mark will be extended as required to hit the desired launch time.
HH...MM...SS...EDT........EVENT Sat 10/30/10 ...............01:30 PM......Call to stations 74...12...00...02:00 PM......Countdown begins Sun 10/31/10 64...12...00...12:00 AM......Fuel cell reactant load preps 58...42...00...05:30 AM......MEC/SRB power up 58...12...00...06:00 AM......Clear crew module 58...12...00...06:00 AM......Begin 4-hour built-in hold 58...12...00...06:00 AM......Clear blast danger area 57...27...00...06:45 AM......Orbiter pyro-initiator controller test 57...17...00...06:55 AM......SRB PIC test 56...17...00...07:55 AM......Master events controller pre-flight BITE test 54...12...00...10:00 AM......Resume countdown 52...42...00...11:30 AM......Fuel cell oxygen loading begins 50...12...00...02:00 PM......Fuel cell oxygen load complete 50...12...00...02:00 PM......Fuel cell hydrogen loading begins 47...42...00...04:30 PM......Fuel cell hydrogen loading complete 46...42...00...05:30 PM......Pad open; ingress white room 46...12...00...06:00 PM......Begin 8-hour built-in hold 46...12...00...06:00 PM......PRSD offload 45...12...00...07:00 PM......Crew module clean and vacuum 42...12...00...10:00 PM......Remove APU vent covers 41...42...00...10:30 PM......OMBUU demate 41...12...00...11:00 PM......SSME throat plug removal Mon 11/01/10 38...12...00...02:00 AM......Countdown resumes 38...12...00...02:00 AM......Main engine preps 38...12...00...02:00 AM......MECs 1 and 2 on; avionics system checkout 35...12...00...05:00 AM......FRCS Tyvek cover remova/inspect 31...42...00...08:30 AM......Deflate RSS dock seals; tile inspection 31...12...00...09:00 AM......Tile inspection 31...12...00...09:00 AM......TSM prepped for fueling 30...12...00...10:00 AM......Begin 13-hour 52-minute hold 30...22...26...09:50 AM......Crew orbiter/payload briefings 28...42...00...11:30 AM......RSS rotation preps 28...42...00...11:30 AM......OIS communications check with JSC 27...52...00...12:20 PM......JSC flight control team on station 26...42...00...01:30 PM......Comm activation 26...12...00...02:00 PM......Crew module voice checks 25...12...00...03:00 PM......L-1 engineering briefing 24...57...00...03:15 PM......Crew weather briefing 24...12...00...04:00 PM......Flight crew equipment late stow 21...42...00...06:30 PM......RSS to park position 20...12...00...08:00 PM......Final TPS, debris inspection 19...42...00...08:30 PM......Ascent switch list 16...20...00...11:52 PM......Resume countdown Tue 11/02/10 16...00...00...12:12 AM......Pad clear of non-essential personnel 16...00...00...12:12 AM......APU bite test 15...10...00...01:02 AM......Fuel cell activation 14...20...00...01:52 AM......Booster joint heater activation 13...50...00...02:22 AM......MEC pre-flight bite test 13...35...00...02:37 AM......Tanking weather update 12...50...00...03:22 AM......Final fueling preps; launch area clear 12...20...00...03:52 AM......Red crew assembled 11...35...00...04:37 AM......Fuel cell integrity checks complete 11...20...00...04:52 AM......Begin 2-hour built-in hold (T-minus 6 hours) 11...10...00...05:02 AM......Safe-and-arm PIC test 10...20...00...05:52 AM......External tank ready for loading 09...57...00...06:15 AM......Mission management team tanking meeting 09...32...00...06:40 AM......NASA TV fueling coverage begins 09...20...00...06:52 AM......Resume countdown (T-minus 6 hours) 09...20...00...06:52 AM......LO2, LH2 transfer line chilldown 09...16...00...06:56 AM......Final crew medical checks 09...10...00...07:02 AM......Main propulsion system chill down 09...10...00...07:02 AM......LH2 slow fill 08...40...00...07:32 AM......LO2 slow fill 08...35...00...07:37 AM......Hydrogen ECO sensors go wet 08...30...00...07:42 AM......LO2 fast fill 08...27...00...07:45 AM......Crew medical checks 08...20...00...07:52 AM......LH2 fast fill 06...25...00...09:47 AM......LH2 topping 06...20...00...09:52 AM......LH2 replenish 06...20...00...09:52 AM......LO2 replenish 06...20...00...09:52 AM......Begin 2-hour 30-minute built-in hold (T-minus 3 hours) 06...20...00...09:52 AM......Closeout crew to white room 06...20...00...09:52 AM......External tank in stable replenish mode 06...05...00...10:07 AM......Astronaut support personnel comm checks 05...35...00...10:37 AM......Pre-ingress switch reconfig 05...27...00...10:45 AM......NASA TV launch coverage begins 04...20...00...11:52 AM......Final crew weather briefing 04...15...00...11:57 AM......Crew suit up begins 03...50...00...12:22 PM......Resume countdown (T-minus 3 hours) 03...45...00...12:27 PM......Crew departs O&C building 03...15...00...12:57 PM......Crew ingress 02...25...00...01:47 PM......Astronaut comm checks 02...00...00...02:12 PM......Hatch closure 01...30...00...02:42 PM......White room closeout 01...10...00...03:02 PM......Begin 10-minute built-in hold (T-minus 20m) 01...00...00...03:12 PM......NASA test director countdown briefing 01...00...00...03:12 PM......Resume countdown (T-minus 20m) 00...59...00...03:13 PM......Backup flight computer to OPS 1 00...55...00...03:17 PM......KSC area clear to launch 00...49...00...03:23 PM......Begin final built-in hold (T-minus 9m) 00...24...00...03:53:56 PM...NTD launch status verification 00...09...00...04:08:56 PM...Resume countdown (T-minus 9m) 00...07...30...04:12:56 PM...Orbiter access arm retraction 00...05...00...04:12:56 PM...Launch window opens 00...05...00...04:12:56 PM...Hydraulic power system (APU) start 00...04...55...04:13:01 PM...Terminate LO2 replenish 00...04...00...04:13:56 PM...Purge sequence 4 hydraulic test 00...04...00...04:13:56 PM...IMUs to inertial 00...03...55...04:14:01 PM...Aerosurface profile 00...03...30...04:14:26 PM...Main engine steering test 00...02...55...04:15:01 PM...LO2 tank pressurization 00...02...35...04:15:21 PM...Fuel cells to internal reactants 00...02...30...04:15:26 PM...Clear caution-and-warning memory 00...02...00...04:15:56 PM...Crew closes visors 00...01...57...04:15:59 PM...LH2 tank pressurization 00...00...50...04:17:06 PM...SRB joint heater deactivation 00...00...31...04:17:25 PM...Shuttle GPCs take control of countdown 00...00...21...04:17:35 PM...SRB steering test 00...00...07...04:17:49 PM...Main engine start (T-6.6 seconds) 00...00...00...04:17:56 PM...SRB ignition (LAUNCH)
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