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"930210.DFC" (4287 bytes) was created on 02-10-93
10-Feb-93 Daily File Collection
These files were added or updated between 09-Feb-93 at 21:00:00 {Central}
and 10-Feb-93 at 21:01:07.
=--=--=START=--=--= NASA Spacelink File Name:930210.SHU
KSC SHUTTLE STATUS 2/10/93
SPACE SHUTTLE STATUS REPORT
Wednesday, February 10, 1993
George H. Diller
Kennedy Space Center
Vehicle: OV-102/Orbiter Columbia Current location: Pad 39-A
Primary payload: Spacelab D-2 Crew Size: 7
Orbital altitude: 184 sm Inclination: 28.45 degrees
Mission Duration: 8 days 22 hours Landing Site: KSC
STS-55 ISSUES AND CONCERNS:
A question has arisen about the configuration of the turbine blade tip
seal retainers in the high pressure oxidizer turbopumps on Columbia's main
engines. There are two versions of this component - an old version and a newer
one.
Each has different inspection requirements. On engines using the older
version of the tip seal retainers, there is a requirement to remove the pumps
and inspect the position of the retainers before each flight. This requirement
does not exist for the newer version of the retainers.
Although all indications are that the pumps on Columbia's main engines
have the new seal retainers, in reviewing the paperwork associated with the
engines, it could not be conclusively determined which version of the retainers
had been installed in the engines.
Therefore, as a precautionary measure, a decision has been made to remove
and replace the pumps on all three main engines. The purpose of the tip seals
is to minimize the flow of gas around the tips of the turbine blades to enhance
pump performance. The retainers hold these seals in place.
Columbia was moved to Complex 39's Pad A on Sunday, Feb. 7, and changeout
of the high pressure oxidizer turbopumps will be accomplished at the pad.
Spare pumps are available.
A final work schedule has yet to be developed but removal, replacement and
checkout of the pumps is expected to begin immediately and will require
approximately 20 days. In addition, approximately 12 days of work will be
required to complete the flow. At this time, launch of Columbia on the STS-55
mission is not expected prior to early March.
A review of the pumps on Orbiters Discovery and Endeavour is in work and
those on Discovery will be changed out after rollover from the Orbiter
Processing Facility. This work will be accomplished while the vehicle is in the
vertical position in the Vehicle Assembly Building or at the launch pad.
Discovery's next launch - on the STS-56 mission - is tentatively scheduled for
late March.
STS-55 IN WORK:
- preparations to remove high pressure oxidizer turbopumps
- preparations in Firing Room 1 for TCDT countdown
- potable water microbial sampling
- astronaut fit check of launch and entry suits
- astronaut M113 orientation and driver training
- astronaut emergency egress classroom training
STS-55 WORK COMPLETED:
- Flight Readiness Test of main engines and aerosurfaces
- KSC Launch Readiness Review
- astronaut arrival for TCDT
WORK SCHEDULED:
- STS-55 Flight Readiness Review Thursday
- Terminal Countdown Demonstration Test begins 8:30 a.m. Thursday
- removal of high pressure oxidizer turbo pumps starting Saturday
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
=--=--=-END-=--=--=
=--=--=START=--=--= NASA Spacelink File Name:6_8_3_4_51.TXT
MGN STATUS 2/8
MAGELLAN STATUS
Status report of Magellan for Monday, February 8, 1993:
1. The Magellan spacecraft continues to operate normally, transmitting a
carrier signal plus 1200 bps X-band telemetry.
2. The spacecraft has completed 6727 orbits of Venus and is now 58% complete
on its gravity data collection in Cycle-4. We are now 105 days away from the
start of the Transition Experiment.
3. The Radar Sensor Test Bed has been moved to Bldg. 198 and the space
reconfigured for the Data Management Team. These steps are in preparation for
releasing approximately 1400 Sq. ft. of 230-2nd floor to the new RRapid
Protyping Test Bed.S
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
=--=--=-END-=--=--=
=--=END OF COLLECTION---COLLECTED 2 FILES---COMPLETED 21:09:14=--=