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1990-10-08
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Mission Control Status #5
MISSION CONTROL STATUS REPORT
REPORT 5
Oct. 7, 1990, Flight Day 2
MET 01/03:39
CDT 10:25 a.m.
Monitoring secondary payloads is the focus of the STS-
41 crew's second day orbiting the Earth. Crew members powered
up the orbiter's Remote Manipulator System (RMS) about
1/02:15 or 9 a.m. CDT today and are progressing through its
checkout sequence. Mounted on Discovery's RMS arm is the
Intelsat Solar Array Coupon (ISAC) experiment. The ISAC will
measure the effects of atomic oxygen in low Earth orbit on
the Intelsat's solar arrays, to judge if those effects will
seriously damage the stranded satellite. Intelsat, launched
aboard a commercial expendable launch vehicle earlier this
year, is stranded in low orbit. At the request of the
International Telecommunications Satellite Organization, it
is being evaluated for a possible Shuttle rescue mission in
1992. ISAC consists of two solar array material samples
mounted on the Shuttle's robot arm. The arm was extended to
hold the samples perpendicular to the Shuttle payload bay,
facing the direction of travel, and will remain there for at
least 23 consecutive hours.
Mission Specialist Bill Shepherd reported he and fellow
mission specialist Bruce Melnick had experienced some
difficulties with the Voice Command System (VCS) experiment. The
experiment uses verbal commands to control the onboard Shuttle
television cameras. The system works on personalized "templates"
to identify the user. The templates are computer chips that
recognize the human voice and make "imprints" of words, which it
stores as commands Investigators had speculated the system might
encounter some difficulty in identifying Shepherd and Melnick's
voices in space because in weightlessness astronauts' diaphragms
are not under the influence of gravity and result in changed
voice characteristics. Shepherd reported the system had failed
to identify his template and did not respond to the retraining
mode, which allows the astronauts to redo their templates.
However, the system did respond when Melnick activated the
retraining mode. This session of the VCS was one of three
planned. The next VCS session is scheduled for about 5 a.m. CDT
Monday.