STS-133 Launch Timeline

February 24, 2011 22:08 by scibuff

Update: See the mission details and more photos in my STS-133 Space Shuttle Discovery post.

The milestones of STS-133 Space Shuttle Discovery launch (reverse order):

03:50 GMT (Feb. 25) – Crew sleep begins
02:15 GMT (Feb. 25) – ET video downlink
02:10 GMT (Feb. 25) – ET photo
22:40 GMT – Post insertion timeline begins
22:30 GMT – OMS-2 rocket firing (orbit circularization)

~ 22:03:34 GMT @ T+09:00 – Nominal MECO, OMS-1 not required. With a direct insertion ascent, the main engines are burned slightly longer to achieve the desired apogee altitude, such that an OMS-1 maneuver (which would supply the additional thrust needed to reach orbit) is not required.

- 22:03:07 GMT @ T+08:33 – External Tank (ET) separation.

External Tank Separation

External Tank Separation

- 22:03:04 GMT @ T+08:30 – Zero Thrust.

- 22:02:58 GMT @ T+08:24 – Main Engine Cut-off (MECO). Discovery has reach the planned orbit and is schedule to dock with the International Space Station on Flight Day 3.

- 22:02:15 GMT @ T+07:41 - Negative Istres.

- 22:01:54 GMT @ T+07:20 - Negative Moron.

- 22:00:47 GMT @ T+06:13 – Press to MECO and Single Engine Zaragoza 104 – Discovery can now reach planned orbit in case of a single SSME failure and the Zaragoza TAL site on a single engine at 104.5% throttle.

- 22:00:04 GMT @ T+05:30 – Single Engine OPS-3, select Zaragoza – Discovery could now reach the designated TAL site in Zaragoza Spain with a single engine at Full Power Level (FPL), i.e 109% throttle, should two of the SSME‘s fail (the OPS-3 software mode will be used for re-entry) – Prior to this point, the loss of two engines requires contingency abort procedures and OPS 6 software.

- 22:00:02 GMT @ T+05:28 – Roll to heads-up.

- 21:59:42 GMT @ T+05:08 – Press to ATO select Zaragoza – Discovery could now reach a safe orbit (circular / 194.5 km) with two Space Shuttle Main Engines (SSME) throttled at Typical Mission Power Level (104.5%) in case of a single SSME failure. Should one of the engines fail the crew could execute the Abort To Orbit (ATO) maneuver (in case of TAL abort, the landing facility in Zaragoza would be used).

- 21:59:02 GMT @ T+04:28 – End of OMS Assist.

- 21:58:28 GMT @ T+03:54 – Negative Return – Discovery has used too much fuel and is traveling too fast (9,310 km/h), too high (95 km) and is too far (191 km) to return to the Shuttle Landing Facility (SLF) at the Kennedy Space Center (KSC) for a potential Return To Launch Site (RTLS) abort.

- 21:57:26 GMT @ T+02:52 – 2 engine Istres. Discovery can now reach the Transoceanic Abort Landing (TAL) site in Istres in the case of a single engine failure.

- 21:57:15 GMT @ T+02:41 – 2 engine Zaragoza. Discovery can now reach the TAL site in Zaragoza in the case of a single engine failure.

- 21:57:10 GMT @ T+02:36 – 2 engine Moron. Discovery can now reach the TAL site in Moron in the case of a single engine failure.

- 21:56:47 GMT @ T+02:13 – Orbital Maneuvering System (OMS) assist.

- 21:56:37 GMT @ T+02:03Solid Rocket Booster (SRB) separation. Discovery is at the altitude of 45.08 km, 40.87 km down range from the KSC, traveling at 5 838.70 km/h (Mach 4).

SRB SEP

SRB SEP

- 21:54:35 GMT @ T+01:01 – Max-Q (the point of the greatest dynamic pressure).

- 21:54:27 GMT @ T+00:53 –Throttle up back to 104.5% engine power level.

- 21:54:22 GMT @ T+00:48 – Mach 1.

- 21:54:14 GMT @ T+00:40 – Throttle down from 104.5% to 72.0% engine power level at Mach 0.9.

- 21:53:52 GMT @ T+00:18 – Roll maneuver finished.

- 21:53:45 GMT @ T+00:11 – Start the roll program.

- 21:53:34 GMT @ T-00:00 – Lift-off. Solid Rocket Booster (SRB) ignition and lift-off of the Space Shuttle Discovery on the STS-133 (ISS assembly flight 20A) mission to the International Space Station (ISS).

Lift-off of Space Shuttle Discovery

Lift-off of Space Shuttle Discovery

- 21:50:20 GMT @ T-00:06.6 (and 06.48, 06.36) – The three Space Shuttle Main Engines (SSME) start.

Space Shuttle Main Engines (SSME) start

Space Shuttle Main Engines (SSME) start

- 21:50:18 GMT @ T-00:09 – The hydrogen burn-off system begins to eliminate free hydrogen exhausted into the main engine nozzles during the start sequence to prevent small, but potentially dangerous, explosions when the main engines ignite.

The hydrogen burn-off system begins to eliminate free hydrogen

The hydrogen burn-off system begins to eliminate free hydrogen

- 21:50:12 T-00:15 – The Sound Suppression Water System has been activated to protect Discovery and the launch pad from acoustical energy and rocket exhaust reflected from the flame trench and Mobile Launcher Platform during launch.

- 21:49:56 GMT @ T-00:31 – Auto-sequence start. Discovery’s on-board computers have primary control of all vehicle’s critical functions.

- 21:45:32 GMT: Terminate LO2 replenish
- 21:48: GMT: T-5 minutes and counting

T-4 minutes and 59 seconds and counting

T-4 minutes and 59 seconds and counting

- 21:45:27 GMT: Launch window opens, T-5 minutes and holding (the launch window expires at 21:55:27 GMT)

- 21:41:27 GMT: The countdown clock resumes at T-9min and counting.

T-8 minuts and 59 seconds and counting

T-8 minuts and 59 seconds and counting

- 21:21 GMT: NASA Test Director (NTD) launch status verification.
- 20:56 GMT: Begin final built-in hold (T-minus 9m)

- 20:45 GMT: Resume countdown (T-minus 20m)
- 20:35 GMT: Begin 10-minute built-in hold (T-minus 20m)

- 19:45 GMT: Shuttle Discovery’s hatch has been closed and latched for flight, the six STS-133 astronauts are strapped into their seats.

- 19:20 GMT: Astronaut comm checks.

- 18:00 GMT: The STS-133 crew leaves the crew quarters at the Operations and Checkout Building and board the Astrovan to head to the Pad 39A.

STS-133 Crew Heads to the Pad - The six Discovery astronauts suited up in their flight gear wave to the crowd and board NASA's Astrovan for the short trip to Launch Pad 39A. - Credit: NASA

- 17:55 GMT: Resume countdown (T-minus 3 hours).

T-3 hours and holding

T-3 hours and holding

- 15:25 GMT: The shuttle tanking went into a stable replenish and the countdown entered a 2.5 hour long inbuilt hold at T-3 hours. During the hold the closeout crew will proceed to white room at the pad and the astronauts will suit up.

- 15:20 GMT: The liquid hydrogen tanking has reached 98% and will transition from fast-full to top-off at 2700 l per minute.

- 13:15 GMT: Liquid oxygen tanking changes to fast-fill mode at almost 6,000 l per minute. Liquid hydrogen is also in fast-fill phase adding almost 32,000 liters every minute into the external tank (ET).

- 13:05 GMT: Launch teams began liquid oxygen tanking in the slow-fill phase adding 1,200 liters every minute.

- 12:25 (Feb. 24) GMT: Fueling of the External Tank began with liquid hydrogen (at 20K) in the slow-fill mode. Liquid oxygen (at 90.188 K) will follow at 13:05 GMT. Resume countdown (T-minus 6 hours)

- 10:13 GMT: The crew wakes up in the crew quarters inside the Operations & Checkout Building at KSC
- 10:25 GMT: Begin 2-hour built-in hold (T-minus 6 hours)
- 05:25 (Feb. 24) GMT: Resume countdown at T-11 hours

The Mission Click at T-minus 11 hours

The Mission Click at T-minus 11 hours and holding with Launch Pad 39-A and Space Shuttle Discovery in the background

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Discovery’s last trip to space begins

[...] 1: Check out the launch timeline for launch milestones and more [...]

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