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Onderwerp: SPACE SHUTTLE MISSION STS-95 LAUNCH COUNTDOWN TO BEGIN OCT. 26
NASA News
National Aeronautics and
Space Administration
John F. Kennedy Space Center
Kennedy Space Center, Florida 32899
For release:
Oct. 21, 1998
KSC RELEASE NO. 125-98
SPACE SHUTTLE MISSION STS-95 LAUNCH COUNTDOWN TO BEGIN OCT. 26
NASA will begin the countdown for launch of Space Shuttle Discovery
on mission STS-95 on Oct. 26, at 8 a.m. EST at the T-43 hour mark. The KSC
launch team will conduct the countdown from Firing Room 1 of the Launch
Control Center.
The countdown includes 35 hours of built-in hold time leading to an
opening of the launch window at 2 p.m. on Oct. 29. The launch window extends
for 2 hours and 30 minutes.
This will be the fourth Space Shuttle mission of the year. Mission
STS-95 will mark the 25th flight of the orbiter Discovery and the 92nd
flight overall in NASA's Space Shuttle program. STS-95 is slated to last 8
days, 21 hours, 49 minutes. Discovery is scheduled to land at KSC at 11:49
a.m. on Nov. 7.
The primary objectives of this mission are to conduct microgravity
research in the SPACEHAB module, deploy and retrieve the Spartan-201
solar-observing spacecraft, and perform experiments with the Hubble Space
Telescope Orbital Systems Test (HOST) and the International Extreme
Ultraviolet Hitchhiker (IEH-03). U.S. space pioneer John Glenn will work
with Japanese astronaut Chiaki Mukai to investigate the correlation between
the aging process on earth and physiological effects of space flight on the
human body.
Discovery was rolled out of Kennedy Space Center's Orbiter Processing
Facility bay 2 on Sept. 14 and then mated with the external tank and solid
rocket boosters in the Vehicle Assembly Building. The Shuttle stack was
transported to pad 39B on Sept. 21.
The STS-95 crew consists of: Commander Curt Brown, Pilot Steve
Lindsey, Mission Specialists Scott Parazynski, Stephen Robinson, Pedro Duque
and Payload Specialists Chiaki Mukai and John Glenn.
The crew is scheduled to arrive at KSC at about 2 p.m., Monday, Oct.
26. Their activities at KSC prior to launch will include crew equipment fit
checks, medical examinations and opportunities to fly in the Shuttle
Training Aircraft.
-2-
COUNTDOWN MILESTONES
*all times are Eastern
Launch - 3 Days (Monday, Oct. 26)
* Prepare for the start of the STS-91 launch countdown
* Perform the call-to-stations (7:30 a.m.)
* All members of the launch team report to their respective consoles in
Firing Room 1 in the Launch Control Center for the start of the countdown
* Countdown begins at the T-43 hour mark (8 a.m.)
* Begin final vehicle and facility close-outs for launch
* Check out back-up flight systems
* Review flight software stored in mass memory units and display systems
* Load backup flight system software into Discovery's general purpose
computers
* Activate and test navigational systems (9 p.m.)
* Complete preparations to load power reactant storage and distribution
system (11 p.m.)
Launch - 2 Days (Tuesday, Oct. 27)
Enter first planned built-in hold at T-27 hours for duration of four hours
(12 midnight)
* Clear launch pad of all non-essential personnel
* Perform test of the vehicle's pyrotechnic initiator controllers
* Open launch pad to personnel supporting PRSD load
Resume countdown (4 a.m.)
* Begin operations to load cryogenic reactants into Discovery's fuel cell
storage tanks
(4 a.m. - 12 noon)
Enter four-hour built-in hold at T-19 hours (12 noon)
* Demate orbiter mid-body umbilical unit and retract into fixed service
structure
* Resume orbiter and ground support equipment close-outs
Resume countdown (4 p.m.)
* Start final preparations of the Shuttle's three main engines for main
propellant tanking and flight
* Close-out the tail service masts on the mobile launcher platform
Enter planned hold at T-11 hours for 23 hours, 40 minutes (12 midnight)
Launch - 1 Day (Wednesday, Oct. 28)
* Begin vertical payload closeouts
* Activate the orbiter's flight controls and navigation systems
* Begin startracker functional checks
* Activate orbiter's inertial measurement units
* Install film in numerous cameras on the launch pad
* Activate the orbiter's communications systems
-3-
* Flight crew equipment late stow begins (3:30 p.m.)
* Fill pad sound suppression system water tank
* Safety personnel conduct debris walk down
* Move Rotating Service Structure (RSS) to the park position (8 p.m.)
* Perform orbiter ascent switch list in crew cabin
* Start fuel cell flow-through purge
Resume countdown (11:40 p.m.)
* Activate the orbiter's fuel cells
Launch Day (Thursday, Oct. 29)
* Configure communications at Mission Control, Houston, for launch
* Clear the blast danger area of all non-essential personnel
* Switch Discovery's purge air to gaseous nitrogen
* Complete inertial measurement unit activation
Enter planned one-hour built-in hold at the T-6 hour mark (4:40 a.m.)
* Launch team verifies no violations of launch commit criteria prior to
cryogenic loading of the external tank
* Clear pad of all personnel
Resume countdown (5:40 a.m.)
* Begin loading the external tank with about 500,000 gallons of cryogenic
propellants (about 5:40 a.m.)
* Complete filling the external tank with its flight load of liquid hydrogen
and liquid oxygen propellants (about 8:40 a.m.)
Enter planned two-hour built-in hold at T-3 hours (8:40 a.m.)
* Perform inertial measurement unit preflight calibration
* Align Merritt Island Launch Area (MILA) tracking antennas
* Close-out crew and Final Inspection Team proceed to Launch Pad 39B
Resume countdown at T-3 hours (10:40 a.m.)
* Perform open loop test with Eastern Range
* Crew departs Operations and Checkout Building for the pad (about 10:45
a.m.)
* Complete close-out preparations in the white room
* Check cockpit switch configurations
* Flight crew begins entry into the orbiter (about 11:15 a.m.)
* Astronauts perform air-to-ground voice checks with Launch Control and
Mission Control
* Close Discovery's crew hatch (about 12:30 p.m.)
* Perform hatch seal and cabin leak checks
* Complete white room close-out
* Close-out crew moves to fallback area (about 1:20 p.m.)
* Primary ascent guidance data is transferred to the backup flight system
-4-
Enter planned 10-minute hold at T-20 minutes (1:20 p.m.)
* NASA Test Director conducts final launch team briefings
* Complete inertial measurement unit pre-flight alignments
Resume countdown (1:30 p.m.)
* Transition the orbiter's onboard computers to launch configuration
* Start fuel cell thermal conditioning
* Close orbiter cabin vent valves
* Transition backup flight system to launch configuration
Enter planned 10-minute hold at T-9 minutes (1:41 p.m.)
* Launch Director, Mission Management Team and NASA Test Director conduct
final polls for go/no go to launch
Resume countdown at T-9 minutes (1:51 p.m.)
* Start automatic ground launch sequencer (T-9:00 minutes)
* Retract orbiter crew access arm (T-7:30)
* Start mission recorders (T-6:15)
* Start Auxiliary Power Units (T-5:00)
* Arm SRB and ET range safety safe and arm devices (T-5:00)
* Start liquid oxygen drainback (T-4:55)
* Start orbiter aerosurface profile test (T-3:55)
* Start main engine gimbal profile test (T-3:30)
* Pressurize liquid oxygen tank (T-2:55)
* Begin retraction of the gaseous oxygen vent arm (T-2:55)
* Fuel cells to internal reactants (T-2:35)
* Pressurize liquid hydrogen tank (T-1:57)
* Deactivate SRB joint heaters (T-1:00)
* Orbiter transfers from ground to internal power (T-0:50 seconds)
* Ground Launch Sequencer go for auto sequence start (T-0:31 seconds)
* SRB gimbal profile (T-0:21 seconds)
* Ignition of three Space Shuttle main engines (T-0:6.6 seconds)
* SRB ignition and liftoff (T-0)
-5-
SUMMARY OF BUILT-IN HOLDS FOR STS-95
T-TIME LENGTH OF HOLD HOLD BEGINS HOLD ENDS
T-27 hours
4 hours
12 a.m. Tues.
4 a.m. Tues.
T-19 hours
4 hours
12 p.m. Tues.
4 p.m. Tues.
T-11 hours
23 hours, 40 minutes
12 a.m. Wed.
11:40 p.m. Wed.
T-6 hours
1 hour
4:40 a.m. Thurs.
5:40 a.m. Thurs.
T-3 hours
2 hours
8:40 a.m. Thurs.
10:40 a.m. Thurs.
T-20 minutes
10 minutes
1:20 p.m. Thurs.
1:30 p.m. Thurs.
T-9 minutes
10 minutes
1:41 p.m. Thurs.
1:51 p.m. Thurs.
CREW FOR MISSION STS-95
Commander (CDR):
Curt Brown
Pilot (PLT):
Stephen Lindsey
Mission Specialist (MS1):
Scott Parazynski
Mission Specialist (MS2):
Stephen Robinson
Mission Specialist (MS3):
Pedro Duque
Payload Specialist (PS1):
Payload Specialist (PS2):
Chiaki Mukai
John Glenn
SUMMARY OF STS-95 LAUNCH DAY CREW ACTIVITIES
Thursday, Oct. 29
7:50 a.m.
Wake up
*9:35 a.m.
10:05 a.m.
Breakfast/crew photo
Weather briefing
*10:30 a.m.
*10:45 a.m.
*11:15 a.m.
*12:30 p.m.
*2 p.m.
Flight crew don launch and entry suits
Depart for Launch Pad 39B
Arrive at white room and begin ingress
Close crew hatch
Launch
* Televised events (times may vary slightly)
All times Eastern
-- end --
.
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