Kennedy Space Center, Fla.

Nov. 11, 1995
STATUS REPORT : S-19951111
10:30 a.m.

NASA scrubbed the launch of Space Shuttle Atlantis on Mission STS-74 this morning due to unacceptable weather conditions at the three available emergency Trans-Atlantic Landing sites. The external tank is being drained of cryogenic propellants.

At this time, weather conditions at the Ben Guerir, Morocco emergency site in Africa are forecast to be marginally better on Sunday. However, little change is anticipated at Zaragoza or Moron, Spain. All TAL sites, however, improve significantly beginning Monday continuing into early next week. Locally, a cold front will pass through the Cape Canaveral vicinity about mid-evening with a squall line ahead of the front having associated rain and high wind. The rotating service structure will be moved into position around Space Shuttle Atlantis early this afternoon for weather protection and will be retracted after the threat of bad weather has passed early tonight.

The weather forecast at KSC for tomorrow calls for colder temperatures, an increase in sustained winds and a reasonable chance of having acceptable cloud conditions. The chance of launch weather criteria violation on Sunday is 40%, but increases to 60% on Monday and 70% on Tuesday as the result of a low pressure system forming over the southeast Atlantic Ocean which will drift northward.

The Mission Management Team will meet in the Launch Control Center tonight at 9:30 p.m. to assess the turnaround activities and readiness for tanking. Also, the progress of the cold front and the weather overseas will be closely assessed. At that time, should there be a consensus that weather will not be acceptable, then the launch attempt could be postponed another 24 hours. If a go for tanking is given, it will begin at 10:00 p.m.

The launch window opens on Sunday at 7:30 a.m. EST and once again extends for approximately 7 minutes. The mission duration is slightly longer, changing to 8 days, 5 hours, 3 minutes. Based on an on-time lift-off, landing would occur at KSC on Nov. 20 at 12:34 p.m. EST. The docking of Atlantis with MIR occurs at approximately 1:27 a.m. on Nov. 15. Undocking occurs at approximately 3:16 a.m. on Nov. 18.

The STS-74 crew has returned to the astronaut quarters and is maintaining a sleep cycle which coincides with that of the MIR cosmonauts. They will go to bed this afternoon at approximately 1:30 p.m. and be awakened at approximately 9:30 p.m. tonight.


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