home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: sci.space.shuttle
- Path: sparky!uunet!charon.amdahl.com!pacbell.com!decwrl!elroy.jpl.nasa.gov!sdd.hp.com!caen!batcomputer!cornell!rochester!rit!isc-newsserver!ritvax.isc.rit.edu!DSF5454
- From: dsf5454@ritvax.isc.rit.edu
- Subject: Launch sequence of events?
- Message-ID: <1992Nov6.000648.6893@ultb.isc.rit.edu>
- Sender: news@ultb.isc.rit.edu (USENET News System)
- Nntp-Posting-Host: vaxa.isc.rit.edu
- Reply-To: dsf5454@ritvax.isc.rit.edu
- Organization: Rochester Institute of Technology
- Date: Fri, 6 Nov 1992 00:06:48 GMT
- Lines: 67
-
- Hello, net community... I just got this information. However, I would like to
- see if anyone can correct this or add to it. If you don't want to read this,
- just press 'n' or whatever your newsreader permits to skip this article.
-
- (T minus hours:minutes:seconds:tenths of a second)
- T-0:0:06.94 Computer starts SSMEs
- T-0:0:06.60 SSME #1 ignites
- T-0:0:06.48 SSME #2 ignites
- T-0:0:06.36 SSME #3 ignites
- T-0:0:03.00 Shuttle CDR/Pilot checks MPS Press Pc gauge to make sure it's
- above 90%. MN ENGINE STATUS lights should be off.
- T-0:0:02.64 2.64 sec timer for SRB ignition starts.
- T+0:0:00.00 SRBs ignites, Lift-off
- T+0:0:05.50 Launch tower cleared
- T+0:0:07.00 120 degree roll into "heads down" position
- T+0:0:14.00 Roll maneuver completed; LVLH reminder to CDR/Pilot.
- T+0:0:30.00 ADI to give LVLH status.
- T+0:0:44.00 Approx. Mach 1 velocity achieved, Max Q; SSMEs throttle down to
- 65% from 104%.
- T+0:01:06 SSMEs throttle back up to 104%
- T+0:02:00 SRBs burnout - Pc<50 signal appears on CRT indicating that SRB
- combustion chamber pressures (Pc) is less than 50 psi (345 kilopascals).
- T+0:02:07 SRB SEP, approx 174,000 feet high, 160 mi. downrange
- T+0:04:20 Negative return call from Mission Control (MC); RTLS no longer
- possible at this point.
- T+0:06:30 TAL can only occur when velocity is over 1.11 mi/sec or 4000
- MPH.
- T+0:07:00 Report to MC that orbit can be reached even if 2 SSMEs fail.
- T+0:07:40 SSMEs throttle down to keep acceleration at around 3g.
- T+0:08:28 SSMEs throttle down to 65%
- T+0:08:38 MECO
- T+0:08:54 ET SEP.
- T+0:09:00 -Z translation done; preparation for OMS-1 burn
- T+0:10:39 OMS-1 burn.
- T+0:12:24 End of OMS-1 burn.
- T+0:12:30 Post-OMS-1 activities, APU shutdown.
- T+0:45:58 OMS-2 burn.
- T+0:46:34 OMS-2 cut-off.
-
- In orbit (from 160-210 miles at 17,590 mi./hr or almost 5 mi/sec).
- -------------------------------------------------------------------------------
- Vocabulary list:
- SSME-Space Shuttle Main Engine
- SRB-Solid Rocket Boosters
- ADI-Attitude Direction Indicator
- LVLH-Local vertical/local horizontal
- Max Q- Maximum dynamic pressure on orbiter
- RTLS-Return to Launch Site
- TAL-Transatlantic abort
- MC- Mission Control
- MECO-Main Engine Cut Off
- ET-External Tank
- OMS-Orbital Maneuvering System
-
-
- Many thanks!
-
- --Dan Foster
-
- Just in case my .sig doesn't work (I'm having some problems)...you can always
- send e-mail to dsf5454@ritvax.isc.rit.edu
-
-
- |------| Dan Foster, Rochester Institute of Technology
- | Rent | <-- This space for rent!
- | Me! | Sorry, this .sig is still in beta testing! :-)
- |------| Internet address: dsf5454@ritvax.isc.rit.edu
-