WGS-9 – Delta IV-M+(5,4) – Канаверал SLC-37B – 19.03.2017 – 00:18 UTC

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Зловредный пишет:
Есть уже ссылки на будущую трансляцию?

Как минимум - http://www.ulalaunch.com/webcast

За эту пока не уверен - http://original.livestream.com/spaceflightnow

P.S.
Прямая трансляция пуска Delta IV (WGS-9) от Альфы Центавра (на русском языке)

19 марта 2017 г., 2:20 ДМВ

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	Event	Time (hr:min:sec)	EDT	UTC	MSK
1	RS-68A Engine Ignition	-0:00:05.0	19:43:55.0	23:43:55.0	02:43:55.0
	Liftoff (Thrust to Weight > 1)	0:00:00.0	19:44:00.0	23:44:00.0	02:44:00.0
	Begin Pitch/Yaw/Roll Maneuver	0:00:07.0	19:44:07.0	23:44:07.0	02:44:07.0
	Maximum Dynamic Pressure	0:00:46.1	19:44:46.1	23:44:46.1	02:44:46.1
2	SRM 3,4 Burnout	0:01:32.8	19:45:32.8	23:45:32.8	02:45:32.8
	SRM 1,2 Burnout	0:01:35.1	19:45:35.1	23:45:35.1	02:45:35.1
	SRM Jettison 1	0:01:40.1	19:45:40.1	23:45:40.1	02:45:40.1
	SRM Jettison 2	0:01:42.4	19:45:42.4	23:45:42.4	02:45:42.4
3	Payload Fairing Jettison	0:03:14.6	19:47:14.6	23:47:14.6	02:47:14.6
4	Booster Engie Cutoff (BECO)	0:03:56.5	19:47:56.5	23:47:56.5	02:47:56.5
5	First Stage Separation	0:04:03.1	19:48:03.1	23:48:03.1	02:48:03.1
6	Main Engine Start (MES-1)	0:04:16.1	19:48:16.1	23:48:16.1	02:48:16.1
7	Main Engine Cutoff (MECO-1)	0:19:53.6	20:03:53.6	00:03:53.6	03:03:53.6
8	Second Main Engine Start (MES-2)	0:29:26.6	20:13:26.6	00:13:26.6	03:13:26.6
9	Second Main Engine Cutoff (MECO-2)	0:32:35.3	20:16:35.3	00:16:35.3	03:16:35.3
10	WGS-9 Separation	0:41:45.6	20:25:45.6	00:25:45.6	03:25:45.6
11	Third Main Engine Start (MES-3)	1:11:44.6	20:55:44.6	00:55:44.6	03:55:44.6
12	Third Main Engine Cutoff (MECO-3)	1:11:54.8	20:55:54.8	00:55:54.8	03:55:54.8
13	Ocean Impact	12:12:09.6	07:56:09.6	11:56:09.6	14:56:09.6

 

 

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Tory Bruno‏Подлинная учетная запись @torybruno 7 мин. назад
 
Looking good for tonight. Pgo at 90%. #WGS9

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45th Space Wing‏ @45thSpaceWing 3 ч. назад
 
Tonight a #DeltaIV will launch the #WGS9 from pad 37B! Join us back here at 6:44 p.m. for our 60 min countdown!
 

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03/18/2017 17:02

It is a gorgeous spring morning in Florida and the countdown is underway for this evening's liftoff of the United Launch Alliance Delta 4 rocket to place the Wideband Global SATCOM satellite No. 9 into a supersynchronous transfer orbit.

Launch time from Complex 37 at the Cape Canaveral Air Force Station is 7:44 p.m. EDT (2344 GMT).

At this hour, photographers are en route to the launch complex to set up their sound-activated cameras that will capture liftoff tonight.

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И ещё о трансляции (отсюда)

Watch live! Launch broadcast begins March 18 at 7:24 p.m. EDT.
•    Click here to watch via the ULA website.
•     to watch via YouTube.

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ULA‏Подлинная учетная запись @ulalaunch 7 мин. назад
 
The #DeltaIV with #WGS9! Mobile Service Tower will roll back in about 30 mins. Launch @ 7:44ET TONIGHT! @BoeingDefense @usairforce
 

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https://www.nasaspaceflight.com/2017/03/ula-delta-iv-wgs-9-launch/

ULA Delta IV tasked with WGS-9 launch
March 18, 2017 by William Graham

 

United Launch Alliance's first Delta IV launch of 2017 will carry a Wideband Global Satcom spacecraft (WGS-9) into orbit Saturday. The lift off from Cape Canaveral Air Force Station will occurr during a 75-minute launch window that opens at 19:44 local time (23:44 UTC).

 Delta IV Launch:

Saturday's launch will deploy the ninth satellite of the US Air Force's Wideband Global Satcom (WGS) constellation. WGS-9, which was purchased for the Air Force by a group of other nations in exchange for access to the WGS system, will join the eight satellites already in orbit which launched between 2007 and 2016.

Спойлер

Boeing was awarded a contract to develop the WGS system – with two satellites and an option for a third – in 2001, with the first launch scheduled for 2004. The option in the contract was converted to a firm order for a third spacecraft early in 2003.



The WGS program – named Wideband Gapfiller Satellite until 2007 – was initiated to augment the Defence Satellite Communications System (DSCS), providing new and enhanced capabilities and replacing older satellites as they reached the end of their operational lives. WGS spacecraft provide more than ten times the bandwidth of their predecessors – with a single spacecraft having greater bandwidth than the entire DSCS constellation combined. DSCS and WGS would have been replaced by the Transformational Satellite System (TSAT) constellation, however this was canceled in 2009.

Even before TSAT was canceled, the Air Force had begun to expand WGS; increasing the planned number of satellites from three to five in 2006. The Australian government agreed to finance a sixth satellite in exchange for access to the whole constellation, and this was ordered in October 2007. From the fourth satellite onwards the spacecraft have been upgraded with radio frequency (RF) bypass functionality for applications requiring extremely high bandwidth, such as unmanned aerial vehicles (UAVs) deployed on reconnaissance missions.

Four further satellites, including the WGS-9 spacecraft which will launch on Saturday, were ordered between 2010 and 2012. These are designated as Block II Follow-On missions. From WGS-8 onwards, the satellites have been equipped with an upgraded digital channelizers, almost doubling the available downlink bandwidth.



Built by Boeing, WGS satellites are based on the BSS-702 platform and designed for fourteen years of service. Each spacecraft is equipped with an Aerojet Rocketdyne R-4D-15 High Performance Apogee Thruster (HiPAT) to perform insertion into geosynchronous orbit and four Xenon-Ion Propulsion System (XIPS-25) thrusters for stationkeeping.

The WGS-9 satellite carries X and Ka-band transponders. The satellite will use a phased array antenna to provide eight jam-resistant X-band beams, while ten individual antennae will provide Ka-band beams. An additional X-band payload will be used to provide Earth coverage. The satellite can support 8.088 gigahertz of bandwidth, with an expected downlink speed of up to 11 Gbps.

The first WGS satellite, USA-195 or WGS-1, launched aboard an Atlas V 421 in October 2007. The second satellite was also deployed by an Atlas, launching in April 2009.

Beginning with the third launch – in December 2009 – the Delta IV has been used for all subsequent launches, flying in the Delta IV Medium+(5,4) configuration.



This version of the Delta IV uses a single Common Booster Core first stage, four GEM-60 solid rocket motors and a five-metre Delta Cryogenic Second Stage (DCSS).

The Delta IV was developed by Boeing under the US Air Force's Evolved Expendable Launch Vehicle (EELV) program. Boeing inherited the Delta IV design from McDonnell Douglas in a 1997 merger, having had its own EELV proposal rejected the previous year. The Delta IV first flew in November 2002, three months after Lockheed Martin's rival design, the Atlas V, which was developed under the same program.

In 2003, following revelations that Boeing had illegally obtained tens of thousands of pages of documents from Lockheed Martin during the initial competition for EELV launch contracts, the Department of Defense (DoD) moved several launches which had been awarded to Boeing to the Atlas V and temporarily suspended Boeing from bidding for new launch contracts.

The dispute was resolved when the companies agreed to merge their launch operations, forming United Launch Alliance in December 2006 to offer Delta II, Delta IV and Atlas V launches to the US Government.



Saturday's launch will be the thirty-fifth flight of the Delta IV, which has achieved thirty-three successful launches in its previous missions.

The Delta IV Medium+(5,4) configuration has only been used for WGS launches. It is one of five configurations in which the Delta IV has launched; the Medium, which had a single core, no solid rocket motors and a four-metre DCSS, was the smallest version. Used for two launches in 2003 and a third in 2006, it is now effectively retired as no launches are scheduled and no new medium-class payloads are being assigned to the Delta.

The largest configuration, the Delta IV Heavy, uses three cores and a five-metre upper stage. Three intermediate, or Medium+, configurations – the M+(4,2), M+(5,2) and M+(5,4) – are used to launch intermediate payloads. These add two solid rocket motors, a five-metre upper stage and two further solid rocket motors respectively to the single-core vehicle.

United Launch Alliance intends to retire the single-core version of the Delta IV by 2019, with the Atlas V launching all medium and intermediate-class payloads until the introduction of a new rocket, Vulcan, which will replace both the Atlas V and Delta IV.



The Delta IV Heavy will remain flying until Vulcan has been upgraded to carry the US military's heaviest payloads, which can currently only fly aboard the Delta. Saturday's launch will be the second-to-last flight for the Delta IV Medium+(5,4).

The Delta IV will depart from Space Launch Complex 37B at the Cape Canaveral Air Force Station (CCAFS). The Delta launch complex is built on the site of a pad which was used in the 1960s for early test flights supporting the Apollo program.

The original Launch Complex 37B was the site of the first orbital launch of the Saturn I rocket, SA-5, in January 1964, before five further launches with boilerplate Apollo spacecraft. After the Saturn I was retired, two Saturn IB launches were made from LC-37B, the first testing the rocket's S-IVB stage in orbit and the second, Apollo 5, marked the first unmanned test flight of the Apollo Lunar Module.

The Saturn launch complex having been demolished in the 1970s, Delta's launch pad at Complex 37 was constructed in preparation for the Delta IV's maiden flight, which occurred from SLC-37B in November 2002.
 
Saturday's launch will begin with ignition of the Delta IV's RS-68A main engine, five seconds before the countdown reaches zero. Burning liquid hydrogen and liquid oxygen, the RS-68A powers the Common Booster Core (CBC) that form's Delta's first stage. At the zero-second mark in the countdown, the four GEM-60 solid rocket motors will ignite, and the rocket – whose mission number is Delta 377 – will lift off.

Seven seconds into its flight, Delta 377 will begin a series of pitch, yaw and roll manoeuvres to place it on course for orbit. The rocket will fly east downrange along an azimuth of 93.46 degrees, passing through the area of maximum dynamic pressure – Max-Q – 46.1 seconds after liftoff.



The solid rocket motors will begin to burn out 92.8 seconds after launch, with boosters three and four burning out 2.3 seconds ahead of boosters one and two. The two pairs of boosters will separate eight seconds after their respective burnouts.

Three minutes and 14.6 seconds into the mission, the payload fairing will separate from around the WGS-9 satellite at the nose of the rocket. By this point, the rocket will have cleared the lower regions of Earth's atmosphere and the fairing will no longer be needed to protect the spacecraft.

The Common Booster Core will complete its burn three minutes and 56.5 seconds after liftoff. The spent stage will be jettisoned 6.6 seconds later. After stage separation, the second stage – a five-metre Delta Cryogenic Second Stage (DCSS) – will deploy the extendible nozzle of its RL10B-2 engine ahead of ignition. The RL10B-2 will ignite thirteen seconds after staging to begin its first burn.



The DCSS, which like the first stage burns liquid hydrogen and liquid oxygen, will make two burns to deploy WGS-9 into its planned orbit, with a third burn after spacecraft separation to deorbit itself. The first burn will be the longest, lasting fifteen minutes and 37.5 seconds, and will establish the rocket in an initial parking orbit. Nine minutes and 33 seconds after the first burn ends the second will begin, raising the apogee of Delta 377's orbit. This burn will last three minutes and 9.7 seconds.

Spacecraft separation will occur at 41 minutes, 45.6 seconds mission elapsed time, nine minutes and 10.3 seconds after the end of the second burn. WGS-9 will be deployed into a supersynchronous transfer orbit with a perigee of 435 kilometers (270 miles, 235 nautical miles), an apogee of 44,372 kilometres (27,572 miles, 23,959 nautical miles) and an inclination of 27 degrees to the equator. From this orbit, the satellite will use its R-4D apogee motor to raise itself into geostationary orbit.

The second stage will begin its third and final burn twenty-nine minutes and 59 seconds after spacecraft separation.



This ten-second deorbit burn will lower its orbit's perigee so that the stage reenters Earth's atmosphere at the end of its first orbit. Because of the orbit's high apogee, the stage will take another eleven hours to complete this one revolution, while the Earth rotates underneath such that the stage will reenter over the western Pacific. ULA states that the expected impact time for any debris surviving reentry will be twelve hours, twelve minutes and 9.6 seconds mission elapsed time.

Saturday's launch is the third of the year for United Launch Alliance, who conducted Atlas V launches in January and early March to deploy the SBIRS-GEO-3 missile-detection satellite and NROL-79 – a pair of Intruder signals intelligence satellites – respectively. ULA's next launch is scheduled for next Saturday, with another Atlas V due to carry the SS John Glenn – Orbital ATK's OA-7 Cygnus mission to resupply the International Space Station.

The next Delta launch is scheduled for September, with the National Oceanic and Atmospheric Administration's (NOAA) JPSS-1 weather satellite lifting off aboard the penultimate flight of ULA's venerable Delta II rocket. The Delta IV's next launch will occur in October, with the NROL-47 satellite, which is expected to be a Topaz radar imaging spacecraft.

Only one further WGS satellite, WGS-10, is currently scheduled for launch. This is slated to lift off in 2019, aboard the final single-core Delta IV launch.

(Images via ULA).

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Прогноз погоды L-0   
Delta IV WGS-09 L-0 Launch Forecast 18 March
 

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ULA‏Подлинная учетная запись @ulalaunch 2 мин. назад
 
#DeltaIV emerges as the Mobile Service Tower rolls back. #WGS9 mission to launch tonight! Launch window is 7:45-8:59pmEDT
 

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03/18/2017 19:08

(Pic by Walter Scriptunas II)

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03/18/2017 19:10  Gantry rolled back for launch

The 330-foot-tall mobile service tower has been retracted at Cape Canaveral's pad 37B for this evening's launch of the Delta 4 rocket that will place the Wideband Global SATCOM satellite No. 9 into space for the U.S. military and allied nations.

Спойлер

The wheeled structure moved along rail tracks to its launch position about the length of a football field away from the rocket. The 9-million pound tower shielded the Delta from the elements during the its stay on the pad, provided workers 360-degree access to the various areas on the vehicle and was used to attach the solid rocket boosters and payload during the launch campaign. The tower is 90 feet wide and 40 feet deep.

Crews will spend the next couple of hours securing the complex for launch before leaving the danger area around the pad. All workers must be clear of the area for the start of hazardous operations in the countdown, which include fueling the Delta 4's first and second stages with supercold liquid oxygen and liquid hydrogen propellants.

Testing of communications links between the rocket and Air Force Eastern Range will occur after fueling is accomplished. Steering checks of the RS-68A engine and upper stage RL10B-2 powerplant are on tap in the last hour of the count.

A build-in hold is slated for T-minus 4 minutes, during which time teams will go through final polling to grant clearance to launch. The Delta 4 will transition to internal power as the count resumes, ordnance will be armed and the propellant tanks pressurized as clocks target the main engine ignition time at T-minus 5 seconds.

Liftoff remains scheduled for 7:44 p.m. EDT (2344 GMT).

"The WGS 9 launch marks a significant occasion for the WGS
constellation as it is the fielding of a satellite procured under a
partnership with Canada, Denmark, the Netherlands, Luxembourg, and New
Zealand providing not only U.S. forces, but also our international partners with enhanced communications capabilities and increased coverage," said Lt. Gen. Samuel Greaves, commander of the Air Force's Space and Missile Systems Center.

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03/18/2017 19:28

The mobile service tower has been secured in its launch position.

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03/18/2017 19:43  L-7 hours and counting

Today marks the 35th flight for Delta 4, born of the Air Force's competition to develop next-generation Evolved Expendable Launch Vehicles. In its previous 34 missions since debuting in November 2002, the Delta 4 has flown 19 flights dedicated to the Defense Department, 10 for the National Reconnaissance Office and 5 commercial missions.

Спойлер

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Ещё один "живой эфир"

AF Space Command‏ @AFSpace 3 мин. назад
 
Live stream of tonight's launch will be available on http://www.af.mil . Be there. #WGS9

[Зловредный]

Вот если успешно запустят, счёт будет уже 6 к 1 в пользу США 

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03/18/2017 20:43  L-6 hours and counting

Now 6 hours till launch. The countdown is proceeding well and the launch team is not reporting any issues. A full weather briefing to mission managers will occur in about an hour.

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http://spaceflight101.com/delta-iv-countdown-timeline/

Delta IV Countdown Timeline

Спойлер

[TH]Time[/TH] [TH]Event[/TH][/TR][TR][TD]L-08:00:00[/TD][TD]Mobile Service Tower Retraction Weather Briefing[/TD][/TR][TR][TD]L-08:00:00[/TD][TD]Mobile Service Tower Retraction Start[/TD][/TR][TR][TD]L-05:30:00[/TD][TD]Launch Pad Evacuation, Road Blocks Set[/TD][/TR][TR][TD]L-05:00:00[/TD][TD]Blast Danger Area Clear[/TD][/TR][TR][TD]L-05:00:00[/TD][TD]Tanking Weather Briefing[/TD][/TR][TR][TD]04:15:00[/TD][TD]Countdown Clock Initialization[/TD][/TR][TR][TD]HOLDING[/TD][TD]Countdown Initiation[/TD][/TR][TR][TD]HOLDING[/TD][TD]Countdown Briefing[/TD][/TR][TR][TD]L-04:33:00[/TD][TD]Go/No GO for Propellant Loading[/TD][/TR][TR][TD]04:15:00[/TD][TD]Redundant Inertial Flight Control Assembly Activation[/TD][/TR][TR][TD]04:15:00[/TD][TD]Cryogenic Tanking begins[/TD][/TR][TR][TD]04:15:00[/TD][TD]Common Booster Core LH2 Tank Chilldown[/TD][/TR][TR][TD]03:55:00[/TD][TD]Common Booster Core LH2 Loading in Slow Fill[/TD][/TR][TR][TD]03:45:00[/TD][TD]CBC LH2 Load Transitions to Fast Fill[/TD][/TR][TR][TD]03:45:00[/TD][TD]Common Booster Core LOX Tank Chilldown[/TD][/TR][TR][TD]03:35:00[/TD][TD]Common Booster Core LOX Loading in Slow Fill[/TD][/TR][TR][TD]03:30:00[/TD][TD]CBC LOX Load Transition to Fast Fill[/TD][/TR][TR][TD]03:20:00[/TD][TD]C-Band Beacon Checkouts, GPS Verifications[/TD][/TR][TR][TD]03:10:00[/TD][TD]Delta Cryogenic Upper Stage LH2 Tank Chilldown[/TD][/TR][TR][TD]03:10:00[/TD][TD]Guidance System Activation[/TD][/TR][TR][TD]02:55:00[/TD][TD]CBC LH2 Topping – Fill & Drain Valve Checks[/TD][/TR][TR][TD]02:50:00[/TD][TD]DCSS LH2 Loading[/TD][/TR][TR][TD]02:40:00[/TD][TD]CBC LOX Topping – Fill & Drain Valve Checks[/TD][/TR][TR][TD]02:30:00[/TD][TD]Delta Cryogenic Upper Stage LOX Tank Chilldown[/TD][/TR][TR][TD]02:30:00[/TD][TD]Launch Weather Briefing[/TD][/TR][TR][TD]02:20:00[/TD][TD]DCSS LOX Loading[/TD][/TR][TR][TD]01:45:00[/TD][TD]DCSS LH2 Topping[/TD][/TR][TR][TD]01:20:00[/TD][TD]DCSS LOX Topping[/TD][/TR][TR][TD]01:10:00[/TD][TD]Radio/Telemetry Link Checks, FTS Checks[/TD][/TR][TR][TD]00:55:00[/TD][TD]Command Receiver Decoder Testing[/TD][/TR][TR][TD]00:50:00[/TD][TD]RS-68 Engine Spin Start Pressurization[/TD][/TR][TR][TD]00:50:00[/TD][TD]RS-68 Gimbal Steering Checks[/TD][/TR][TR][TD]00:45:00[/TD][TD]Flight Termination System Testing complete[/TD][/TR][TR][TD]00:15:00[/TD][TD]Weather Briefing[/TD][/TR][TR][TD]00:08:00[/TD][TD]Launch Pad Ordnance Armed[/TD][/TR][TR][TD]T-4 Minutes & HOLDING[/TD][TD]Variable Hold & Recycle Point[/TD][/TR][TR][TD]L-0:09:30[/TD][TD]Delta IV Ready for Spacecraft to Internal Power[/TD][/TR][TR][TD]L-0:07:00[/TD][TD]Final Status Polls[/TD][/TR][TR][TD]L-0:06:00[/TD][TD]Launch Director GO/No GO; Range Clear[/TD][/TR][TR][TD]L-0:05:00[/TD][TD]Confirm Solar Weather is Go for Launch[/TD][/TR][TR][TD]L-0:05:00[/TD][TD]Delta IV Swingarm Lockpins pulled for Rapid Retract[/TD][/TR][TR][TD]00:04:00[/TD][TD]Delta IV to internal Power[/TD][/TR][TR][TD]00:04:00[/TD][TD]Arm Safe and Arm Switches[/TD][/TR][TR][TD]00:04:00[/TD][TD]DCSS Tank Propellant Securing[/TD][/TR][TR][TD]00:03:30[/TD][TD]Transfer to Internal complete[/TD][/TR][TR][TD]00:03:30[/TD][TD]Common Booster Core Propellant Tank Securing[/TD][/TR][TR][TD]00:03:15[/TD][TD]CBC Pre-Press[/TD][/TR][TR][TD]00:03:00[/TD][TD]Common Booster Core LOX secure at Flight Level[/TD][/TR][TR][TD]00:03:00[/TD][TD]Common Booster Core LH2 secure at Flight Level[/TD][/TR][TR][TD]00:03:00[/TD][TD]Vehicle Ordnance Arming[/TD][/TR][TR][TD]00:03:00[/TD][TD]CBC LOX at Flight Level and Flight Pressure[/TD][/TR][TR][TD]00:02:00[/TD][TD]Master Script Running[/TD][/TR][TR][TD]00:02:00[/TD][TD]Second Stage LOX Securing[/TD][/TR][TR][TD]00:02:00[/TD][TD]Hydraulic System to Flight Pressure[/TD][/TR][TR][TD]00:01:45[/TD][TD]CBC LH2 at Flight Level and Flight Pressure[/TD][/TR][TR][TD]00:01:30[/TD][TD]Second Stage LOX secured at Flight Level[/TD][/TR][TR][TD]00:01:20[/TD][TD]Second Stage LH2 Securing[/TD][/TR][TR][TD]00:01:20[/TD][TD]LOX Ground Support Equipment secured[/TD][/TR][TR][TD]00:01:00[/TD][TD]Range Verification[/TD][/TR][TR][TD]00:00:50[/TD][TD]Second Stage LH2 secure at Flight Level[/TD][/TR][TR][TD]00:00:45[/TD][TD]Launch Enable[/TD][/TR][TR][TD]00:00:45[/TD][TD]Main Power Off[/TD][/TR][TR][TD]00:00:25[/TD][TD]Green Board[/TD][/TR][TR][TD]00:00:15[/TD][TD]Launch Vehicle Igniters armed[/TD][/TR][TR][TD]00:00:14[/TD][TD]Radially Outward Firing Initiators Ignition[/TD][/TR][TR][TD]00:00:10[/TD][TD]Terminal Countdown Sequencer in Control[/TD][/TR][TR][TD]0:00:05.5[/TD][TD]RS-68 LH2 Valve Open[/TD][/TR][TR][TD]0:00:02.0[/TD][TD]RS-68 LOX Valve Open[/TD][/TR][TR][TD]0:00:02.0[/TD][TD]RS-68 Main Engine to Full Thrust Level – 102%[/TD][/TR][TR][TD]0:00:00.04[/TD][TD]Launch Commit[/TD][/TR][TR][TD]0:00:00.04[/TD][TD]Booster Ignition Command[/TD][/TR][TR][TD]0:00:00.00[/TD][TD]Hold-Down Release[/TD][/TR][TR][TD]0:00:00.00[/TD][TD]LIFTOFF[/TD][/TR][/TABLE]

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[tnt22]

03/18/2017 21:08  'Clear the complex'

At the launch pad, all of the hands-on work has been completed and the clearing of personnel is underway in preparation for the start of fueling operations this afternoon and liftoff at 7:44 p.m. EDT (2344 GMT).