Author Topic: SCRUB: Orbital Antares A-ONE LAUNCH ATTEMPT 2 UPDATE THREAD  (Read 34450 times)

Online Galactic Penguin SST

Orbital Sciences ‏@OrbitalSciences (1652Z)
The #Antares Red Team has completed adjustments at the pad and are on the way back to the stand by location.
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Offline Antares

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Re: LIVE: Orbital Antares A-ONE LAUNCH ATTEMPT 2 UPDATE THREAD
« Reply #21 on: 04/20/2013 05:05 PM »
Winds aloft are never discrete limits for any vehicle.  There are day-of-launch calculations done to determine if a vehicle can steer through the wind shears without tumbling and without exceeding structural limits.  Theoretically, a strong-enough headwind could create enough additional drag that the vehicle could not make its performance targets.  That would be a very marginal case with a payload that needs every last pound of performance, or where another factor contributing to low performance would compound the problem and cause the mission to come up short.
If I like something on NSF, it's probably because I know it to be accurate.  Every once in a while, it's just something I agree with.  Facts generally receive the former.

Offline antonioe

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Re: LIVE: Orbital Antares A-ONE LAUNCH ATTEMPT 2 UPDATE THREAD
« Reply #22 on: 04/20/2013 05:16 PM »
L-5:30 balloon data showed us red on debris field (strong mid-alt southwesterlies) I wonder if we shouldn't delay to the latter part of the 2-hour window to let the mid-alt winds settle a bit... that could help the other issue, too.
« Last Edit: 04/20/2013 05:19 PM by antonioe »
ARS LONGA, VITA BREVIS...

Offline Chris Bergin

Heh, sorry about the mod getting stressed. All posts are great in this thread. Many thanks to Antonio for his updates!

Weather is very related to the live launch thread.

Carry on :)

Offline mtakala24

Yep, this isn't like the shuttle launches where the weather was far more complex, with RTLS, TAL and AOA conditions to contend with. And our own weather reporter. :)
« Last Edit: 04/20/2013 05:29 PM by mtakala24 »

Offline antonioe

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Re: LIVE: Orbital Antares A-ONE LAUNCH ATTEMPT 2 UPDATE THREAD
« Reply #25 on: 04/20/2013 05:48 PM »
Beginning LOX loading system (line, etc.) chilldown.
ARS LONGA, VITA BREVIS...

Offline Chris Bergin

Orbital:

T-3 hours: SIGI Alignment is complete. The poll to chill down the LOX commodity delivery system has been completed.

Antares System RF checks completed. Wking an issue w/payload S-Band link. All other links successfully completed range interface testing.

Offline jsmjr

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Re: LIVE: Orbital Antares A-ONE LAUNCH ATTEMPT 2 UPDATE THREAD
« Reply #27 on: 04/20/2013 06:16 PM »
L-5:30 balloon data showed us red on debris field (strong mid-alt southwesterlies) I wonder if we shouldn't delay to the latter part of the 2-hour window to let the mid-alt winds settle a bit... that could help the other issue, too.

Am I right to recall that a decision to delay into the later part of the window must occur prior to LOX load (T-90)? Or is it at commencement of pre-chill (T-180)?

How is it implemented?  Extending a built-in hold?

Offline jnc

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Re: LIVE: Orbital Antares A-ONE LAUNCH ATTEMPT 2 UPDATE THREAD
« Reply #28 on: 04/20/2013 06:27 PM »
Beginning LOX loading system (line, etc.) chilldown.

Thanks ever so much for taking the time, during what must be a busy period, to update us all! It is really appreciated.

Noel
"America Needs - Space to Grow"

(old bumper sticker)

Offline antonioe

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Re: LIVE: Orbital Antares A-ONE LAUNCH ATTEMPT 2 UPDATE THREAD
« Reply #29 on: 04/20/2013 06:32 PM »
Decision to launch at a nominal time other than the beginning of window must be made before beginning of propellant (RP and LOX) loading or L-1h30m.  After than, the variability is limited to +15m - 0m

No "built-in hold" - simply delay beginning of loading phase - everything else can wait with no adverse consequences.
« Last Edit: 04/20/2013 06:33 PM by antonioe »
ARS LONGA, VITA BREVIS...

Offline robertross

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Re: LIVE: Orbital Antares A-ONE LAUNCH ATTEMPT 2 UPDATE THREAD
« Reply #30 on: 04/20/2013 06:36 PM »
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Offline antonioe

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Re: LIVE: Orbital Antares A-ONE LAUNCH ATTEMPT 2 UPDATE THREAD
« Reply #31 on: 04/20/2013 07:04 PM »
Range is trying to relocate some 40 or so people from the extreme south end of Assateague to clear additional people-free space because of the strong southwesterly winds... if they are successful, AND the FAA approves the new debris limit lines, we MIGHT be able to launch today...

If they do it, it would be the most awesome real-time reprogramming I've ever seen a range do...

I guess they will tell them that either they move back or the will NOT see a launch...
« Last Edit: 04/20/2013 07:05 PM by antonioe »
ARS LONGA, VITA BREVIS...

Offline Chris Bergin

Orbital:

Working w/the range to determine times that optimize our ability to get additional balloon data to resolve wx issues.

T-0 now 5:10EDT

Offline Chris Bergin

So to be clear, the T-0 is 21:10 ZULU (17:10 Eastern. 22:10 UK time).

Offline antonioe

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Re: LIVE: Orbital Antares A-ONE LAUNCH ATTEMPT 2 UPDATE THREAD
« Reply #34 on: 04/20/2013 07:15 PM »
FAA won't approve a new range limit line today - not enough time to evaluate change ... maybe for tomorrow.  Nice try by Bill Wrobel and the Wallops range...
ARS LONGA, VITA BREVIS...

Offline Chris Bergin

Range is trying to relocate some 40 or so people from the extreme south end of Assateague to clear additional people-free space because of the strong southwesterly winds...

Everyone tweet this. The chance anyone is there who see it is small, but worth trying. You never know if it might help.

Offline Chris Bergin

FAA won't approve a new range limit line today - not enough time to evaluate change ... maybe for tomorrow.  Nice try by Bill Wrobel and the Wallops range...

Is that a scrub?

Offline Prober

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Re: LIVE: Orbital Antares A-ONE LAUNCH ATTEMPT 2 UPDATE THREAD
« Reply #37 on: 04/20/2013 07:17 PM »
Nice large one for you.
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Offline jsmjr

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Re: LIVE: Orbital Antares A-ONE LAUNCH ATTEMPT 2 UPDATE THREAD
« Reply #38 on: 04/20/2013 07:17 PM »
FAA won't approve a new range limit line today - not enough time to evaluate change ... maybe for tomorrow.  Nice try by Bill Wrobel and the Wallops range...

Is that a scrub?

Wondered same.  Maybe use up more of that 2 hour window?

Offline antonioe

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Re: LIVE: Orbital Antares A-ONE LAUNCH ATTEMPT 2 UPDATE THREAD
« Reply #39 on: 04/20/2013 07:25 PM »
Here's plan: we moved T0 by 10 minutes (5:10 EDT) to allow us to evaluate the 3:30 EDT balloon debris field data - if OK we'll proceed to fueling.  If not, we will delay to 6:10 launch and repeat the eval at 4:30 for a 7:10 launch or scrub.  We're in the process of coordinating this with the balloon guys...
ARS LONGA, VITA BREVIS...

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