yee@trident.arc.nasa.gov (Peter E. Yee) (04/23/91)
KSC SHUTTLE STATUS REPORT - SATURDAY, APR. 20, 1991 - 10 a.m.
STS-39/DoD - DISCOVERY (OV 103) - PAD 39-A
LAUNCH - APRIL 23
LAUNCH MINUS 3 DAYS
WORK IN PROGRESS:
- Launch countdown began on time today at 8:45 a.m at the T-43
hour mark.
- Verification that the data processing system and backup flight
control system are operating.
- Review of flight software.
- Shuttle main engine controllers checked out for flight tonight.
- Final payload servicing operations.
WORK COMPLETED:
- Removal of service platforms from the deck of the mobile
launcher platform (MLP).
- Removing handrails from the launch platform.
- Preparing the MLP hazardous gas detection system for launch.
- Removal of protective covers from the orbiter's reaction con-
trol system thrusters.
- Removing platforms from the crew cabin.
- Payload servicing operations.
WORK SCHEDULED:
- STS-39 flight crew arrival at 6:30 p.m. EDT tonight at the
Shuttle Landing Facility.
- First built-in hold at 12:45 a.m. Sunday at the T-27 hour mark.
Hold will last for 8 hours.
- Closing the payload bay doors for flight Sunday at 5 a.m.
- Launch at 7:05 a.m. EDT Tuesday, April 23.
WEATHER FORECAST:
Probability of launch weather criteria violation at the
beginning of the launch period is 70 percent. For the overall
launch period there is a 50 percent chance for violating weather
criteria.