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"930424.DFC" (16599 bytes) was created on 04-24-93
24-Apr-93 Daily File Collection
These files were added or updated between 23-Apr-93 at 21:00:00 {Central}
and 24-Apr-93 at 21:00:32.
=--=--=START=--=--= NASA Spacelink File Name:6_2_2_43_3.TXT
STS-55 LAUNCH STATUS 4/24/93
STS-55 launch delayed
The launch of STS-55 has been rescheduled to Monday, April 26, at 14:50 UTC
because of a suspected power supply problem on IMU #2.
Following are previous launch date announcements:
KENNEDY SPACE CENTER SPACE SHUTTLE STATUS REPORT
STS-55 L-1 Day
Friday, April 23, 1993
KSC Contact: Bruce Buckingham
Mission: STS-55/SL-D2 Orbital Altitude: 184 miles
Vehicle: Columbia/OV-102 Inclination: 28.45 degrees
Location: Launch Pad 39-A Crew Size: 7
Mission Duration: 8 days/22 hours KSC Landing: May 3
Launch Date: April 24 Landing Time: 8:57 a.m.
Launch Window: 10:52 a.m. - 1:22 p.m.
Operations at launch pad 39-A are continuing to run smoothly and without
problem for the launch of Space Shuttle Columbia on mission STS-55. Launch
remains on schedule to occur at the open- ing of the window at 10:52 a.m.
Saturday, April 24.
The countdown clock is currently holding at T-11 hours. This 12 hour, 32
minute built-in hold will last until 8:32 p.m. today.
Rotation of the service structure away from the Shuttle vehicle remains
scheduled for 11:00 a.m.
Following RSS rotation, crews will continue with the instal- lation of
time critical flight crew materials and perform pre- ingress switch list
checks. Also, operations will commence to ac- tivate the fuel cells.
This evening Mission Control, Houston, will configure and check
communication links between mission control, KSC, and the Shuttle Columbia.
The countdown clock will enter the planned one hour hold at the T-6 hour
mark as last minute checks are made prior to loading the external tank with
over 500,000 gallons of liquid oxygen and liquid hydrogen propellants. Once
the pad is clear of all person- nel, tanking will begin at about 2:30 a.m.
tomorrow. Following the three hour tanking operation, the "ice team" will be
deployed to the pad for final assessments of the vehicle.
The seven members of the flight crew have been divided into two shifts for
around-the-clock operations once in orbit. The blue team consists of commander
Steve Nagel, pilot Tom Henricks, mission specialist Jerry Ross and payload
specialist Ulrich Wal- ter. The red team is mission specialists Charles
Precourt and Bernard Harris, and payload specialist Hans Schlegel.
The weather forecast for launch tomorrow is very optimistic with Air Force
forecasters allowing a zero percent probability of violating launch constraints
during the window that opens at 10:52 a.m. The 24 hour and 48 hour delay
predictions show a 10 percent chance of violation each day.
SUMMARY OF HOLDS AND HOLD TIMES FOR STS-55
T-27 hours --- 4 hour hold ----------- Thurs. 8:00 a.m. - 12 noon
T-19 hours --- 4 hour hold ----------- Thurs. 8:00 p.m. - 12 mid.
T-11 hours --- 12 hour, 32 min. hold - Fri. 8:00 a.m. - 8:32 p.m.
T-6 hours ---- 1 hour hold ----------- Sat. 1:32 a.m. - 2:32 a.m.
T-3 hours ---- 2 hour hold ----------- Sat. 5:32 a.m. - 7:32 a.m.
T-20 minutes - 10 minute hold -------- Sat. 10:12 a.m.-10:22 a.m.
T-9 minutes -- 10 minute hold -------- Sat. 10:33 a.m.-10:43 a.m.
SUMMARY OF STS-55 LAUNCH DAY CREW ACTIVITIES
Saturday
5:42 a.m. -------- Wake up
6:12 a.m. -------- Breakfast/Dinner
6:32 a.m. -------- Don flight equipment (PS1, PS2)
6:57 a.m. -------- Weather briefing (CDR, PLT, MS2)
6:57 a.m. -------- Don flight equipment (MS1, MS3)
7:07 a.m. -------- Don flight equipment (CDR, PLT, MS2)
7:37 a.m. -------- Depart for launch pad 39-A
8:07 a.m. -------- Arrive at white room and begin ingress
9:22 a.m. -------- Close crew hatch
10:52 a.m. ------- Launch (April 24, 1993)
CREW FOR MISSION STS-55
Commander (CDR) Steve Nagel
Pilot (PLT) Tom Henricks
Mission Specialist (MS1) Jerry Ross
Mission Specialist (MS2) Charles Precourt
Mission Specialist (MS3) Bernard Harris
Payload Specialist (PS1) Ulrich Walter
Payload Specialist (PS2) Hans Schlegel
Blue Team: Nagel, Henricks, Ross, Walter
Red Team: Precourt, Harris, Schlegel
STS-55 LAUNCH DELAY
3/30/93: ATLAS 2 LAUNCH DATE SET, SPACELAB D-2 MISSION RESCHEDULED
Ed Campion
Headquarters, Washington, D.C. March 30, 1993
LAUNCH ADVISORY
NASA today announced that Space Shuttle Discovery with the
STS-56/ATLAS 2 payload will be the next mission to fly with
launch scheduled for April 6, 1993 at 1:32 a.m. EDT. Space
Shuttle Columbia and the STS-55/Spacelab D-2 payload, which
experienced a launch scrub on March 22, has been assigned a new
target launch date of no earlier than April 24.
The decision for STS-56 to be the next mission flown came
after the main engine team finished analyzing the purge valve
which caused the STS-55 launch scrub. The team's investigation
concluded that the valve from the number 3 main engine failed to
operate properly because of contamination that had been in the
valve since it was manufactured. The team also determined that
this condition could exist in other engines. A series of tests
designed to reveal such a condition have been performed on
Discovery and one suspect valve from one engine is being removed
and replaced.
"Flying the missions in this order is the most effective
use of all our resources" said Shuttle Director Tom Utsman. "The
early April launch of the ATLAS 2 mission will give scientists
the opportunity to observe changes in the Earth's ozone during
the seasonal transition between spring and summer in the
northern hemisphere. At the same time, the launch team at
Kennedy will be working to get Columbia back to launch
configuration for launch on April 24. NASA is very pleased with
the cooperation given by our friends in the German space agency.
They have been involved as all possible options were considered.
Their willingness to let the STS-56 mission have an early April
launch will give the ATLAS folks the chance to collect some very
important data on the Earth's ozone."
As part of the effort to have Columbia ready at the
earliest possible date, all three main engines are being removed
and will be replaced with ones originally scheduled for use
during the STS-57 mission with Space Shuttle Endeavour .
The STS-57 mission, which will involve the first flight of
the SPACEHAB commercial payload and the retrieval of the
European Space Agency's EURECA satellite, is now scheduled to
fly in late May. The rest of the Space Shuttle missions planned
for 1993 will stay in their planned order and schedule.
-end-
3/22/93
While igniting Columbia's three main engines which began at
T-6.6 seconds, the onboard computers initiated a main engine abort
sequence. Shutdown was completed at approximately T-3 seconds at
9:51 a.m. EST.
The reason for the abort appears to be that main engine #3
did not fully ignite due to a liquid oxygen preburner check valve
which apparently experienced an internal leak, causing the purge
system to be pressurized above the maximum 50 pounds per square
inch allowed. Ambient pressure would have allowed full engine
ignition to occur. The onboard computers sensed the higher than
allowed pressure in the line and terminated the main engine
ignition sequence.
The amount of time estimated to pick up the Columbia's STS-55 countdown again
is about a minimum of three weeks. No definite schedule has been developed.
Schedule options are under consideration this week.
STS-55 LAUNCH DATE SET FOR MARCH 21,1993
Ed Campion March 12, 1993
Headquarters, Washington, D.C.
George Diller
Kennedy Space Center, Fla.
Release No. 22-93
NOTE TO EDITORS: NEW LAUNCH DATE FOR STS-55 MISSION
NASA Managers today set March 21, 1993 as the launch date for Shuttle
Mission STS-55 which will see Space Shuttle Columbia and her 7 member crew fly
a mission dedicated to the German Space Agency. The major payload for STS-55,
the pressurized spacelab module - designated as Spacelab-D2 for this flight -
will allow the astronauts to conduct a wide range of experiments in the
microgravity environment of space.
The launch window on March 21 opens at 9:52 a.m. EST. Following launch,
Columbia's crew will be divided into two teams each working a 12-hour shift, so
that science operations can be carried out around the clock. The Spacelab-D2
mission duration is planned for 9 days and will conclude with a landing at
Kennedy Space Center's Shuttle Landing Facility.
Columbia's launch date will have an influence on the next mission to be
flown. Space shuttle Discovery, flying the ATLAS 2 payload on Shuttle Mission
STS-56, now targeted for launch sometime around April 7th. The actual launch
date for STS-56 will be set at a Flight Readiness Review meeting which will be
held approximately two weeks before launch.
"The Shuttle team has done a great job in addressing and closing issues
such as the hydraulic flex hose problem and putting together a new plan for
processing activities" said Shuttle Director Tom Utsman. "Also the cooperation
we've received from the United States Navy, the United States Air Force and
Hughes Space and Communication Company made the March 21st launch of Columbia
possible."
STS-55 STATUS 3/08/93
DAILY NEWS/TV SKED
Daily News
Monday, March 8, 1993
Managers and engineers will continue to asses the launch schedule impact
attributable to inspections of the hydraulic flex hoses and clean-up and
inspection of the aft engine compartment and number two main engine. An
assessment of a new schedule will be made available early this week.
2/26/93: MARCH 14 SET AS LAUNCH DATE FOR STS-55 MISSION
Ed Campion
Headquarters, Washington, D.C. Feb. 26, 1993
George Diller
Kennedy Space Center, Fla.
KSC Release No. 16 - 93
NASA managers today set March 14, 1993 as the launch date
for Shuttle Mission STS-55 which will see Space Shuttle Columbia
and her seven-member crew fly a mission dedicated to the German
Space Agency.
The major payload for STS-55, the pressurized spacelab
module - designated as Spacelab-D2 for this flight - will allow
the astronauts to conduct a wide range of experiments in the
microgravity environment of space. Some 90 experiments are
planned during the mission.
The launch announcement follows the removal, inspection and
replacement of the high pressure oxidizer turbopumps on
Columbia's three main engines. The pump changeout came after a
search of processing paperwork could not conclusively determine
that the pumps were equipped with a newer version of turbine tip
seal retainers. The seals minimize the flow of gas around the
tips of the turbine blades to enhance pump performance and the
retainers hold the seals in place.
The launch window on March 14 extends from 10 a.m. until
12:30 p.m. EST. Following launch, Columbia's crew will be
divided into two teams, each working a 12-hour shift, so that
science operations can be carried out around the clock. The
Spacelab-D2 mission duration is planned for 9 days and will con-
clude with a landing at Kennedy Space Center's Shuttle Landing
Facility. This date was chosen primarily because it was the
first open date on the Eastern Range during this time frame.
# # # # #
STS-55 REVIEW COMPLETED, LAUNCH DATE TO BE SET LATER
Ed Campion
Headquarters, Washington, D.C. February 11, 1993
George Diller
Kennedy Space Center, Fla.
NOTE TO EDITORS: N93-7
NASA managers today completed their review of the flight readiness of
Shuttle Mission STS-55, a mission dedicated primarily to the German Space
Agency for research in life and microgravity sciences.
Because of a decision reached yesterday to remove and replace
Columbia's high pressure oxidizer pumps, a launch date for the mission was not
set. Managers are still assessing the time it will take to perform the work
and resume launch preparations. Tom Utsman, Director of the Space Shuttle
Program, said a launch date for STS-55 would be set the last week in February.
The pumps being replaced feed super cold oxygen to the Shuttle's three
main engines. They are being removed because a search of processing paperwork
could not conclusively determine that the pumps are equipped with a newer
version of turbine tip seal retainers. The tip seals minimize the flow of gas
around the tips of the turbine blades to enhance pump performance and the
retainers hold the seals in place.
The major payload for Space Shuttle Columbia and her 7 member crew is
the pressurized Spacelab module - designated Spacelab-D2 - which will allow the
astronauts to conduct a wide range of experiments in the microgravity
environment of space. Some 90 experiments are planned during the mission.
This will be the 14th flight of the orbiter Columbia and the 54th Space
Shuttle mission.
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
=--=--=-END-=--=--=
=--=--=START=--=--= NASA Spacelink File Name:6_2_2_43_7.TXT
STS-55 Keplerian Elements/State Vector (Predicted)
STS-55 launch delayed
The launch of STS-55 has been rescheduled to Monday, April 26, at 14:50 UTC
because of a suspected power supply problem on IMU #2.
STS-55
1 00055U 93116.66861589 .00120200 00000-0 36300-3 0 79
2 00055 28.4697 268.5815 0003812 314.2100 45.8202 15.90487610 22
Satellite: STS-55
Catalog number: 00055
Epoch time: 93116.66861589 = (26 APR 93 16:02:48.41 UTC)
Element set: JSC-007
Inclination: 28.4697 deg
RA of node: 268.5815 deg Space Shuttle Flight STS-55
Eccentricity: .0003812 Prelaunch Keplerian Elements
Arg of perigee: 314.2100 deg Launch: 26 APR 93 14:50 UTC
Mean anomaly: 45.8202 deg
Mean motion: 15.90487610 rev/day G. L. Carman
Decay rate: 1.2020e-03 rev/day~2 NASA Johnson Space Center
Epoch rev: 2
STS-55
FLIGHT DAY 1 STATE VECTOR (PREDICTED)
ON ORBIT OPERATIONS
(Posted 04/22/93 by Roger Simpson)
The following vector for the flight of STS-55 is provided by NASA Johnson
Space Center, Flight Design and Dynamics Division for use in ground track
plotting programs. The vector represents the predictied trajectory of
Columbia during on orbit operations, after the OMS-2 maneuver. The vector
assumes an on time launch. Questions regarding these postings may be
addressed to Roger Simpson, Mail Code DM4, L. B. J. Space Center, Houston,
Texas 77058.
Lift off Time : 1993/114/14:52:00.000
Lift off Date : 04/24/93
Vector Time (GMT) : 114/15:35:00.000
Vector Time (MET) : 000/00:43:00.000
Orbit Count : 1
Weight : 244237.0 LBS
Drag Coefficient : 2.00
Drag Area : 2750.0 SQ FT
M50 Elements Keplerian Elements
----------------------- --------------------------
X = -16316639.1 FT A = 3608.0505 NM
Y = 11463512.2 FT E = 0.000522
Z = -9082446.2 FT I (M50) = 28.21573 DEG
Xdot = -11959.988763 FT/S Wp (M50) = 258.26527 DEG
Ydot = -21597.692493 FT/S RAAN (M50) = 266.81945 DEG
Zdot = -5764.287807 FT/S / N (True) = 342.98133 DEG
Anomalies \ M (Mean) = 342.99882 DEG
Ha = 162.4037 NM
Hp = 160.0044 NM
Mean of 1950 (M50) : Inertial, right-handed Cartesian system whose
Coordinate System origin is the center of the earth. The epoch
is the beginning of the Besselian year 1950.
X axis: Mean vernal equinox of epoch
Z axis: Earth's mean rotational axis of epoch
Y axis: Completes right-hand system
A: Semi-major axis
E: Eccentricity N: True anomaly
I: Inclination M: Mean anomaly
Wp: Argument of perigee Ha: Height of apogee
RAAN: Right ascension of ascending node Hp: Height of perigee
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
=--=--=-END-=--=--=
=--=END OF COLLECTION---COLLECTED 2 FILES---COMPLETED 21:16:29=--=