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=--=--=START=--=--= NASA Spacelink File Name:6_2_2_46_3_15.TXT
STS-51 EXTRAVEHICULAR ACTIVITY
STS-51 crewmembers Carl Walz and Jim Newman will perform a 6-
hour extravehicular activity (EVA), or spacewalk, on the fifth day of
the mission as a continuation of a series of test spacewalks NASA is
conducting to increase experience with spacewalks and refine
spacewalk training methods.
Walz will be designated extravehicular crew member 1 (EV1) and
Newman will be EV2. Pilot Bill Readdy will serve as the
intravehicular (IV) crew member inside Discovery, supervising the
coordination of spacewalk activities in the Shuttle's cargo bay.
In addition to performing tasks that investigate a spacewalker's
mobility in general, Walz and Newman will evaluate several tools that
may be used during the servicing of the Hubble Space Telescope (HST)
later this year on mission STS-61, including a power socket wrench, a
torque wrench, foot restraint, safety tethers and tool holder.
Unlike Shuttle mission STS-57, the astronauts will not use the
50-foot long robot arm during the spacewalk, since it will be
important for use several days after the spacewalk to retrieve the
ORFEUS-SPAS satellite. Walz and Newman will spend part of their time
outside Discovery testing various types of rigid and semi-rigid
tethers as well as moving up and down the bay carrying each other,
evaluating how well spacewalking astronauts can maneuver in
weightlessness with a large object.
Other tests include an evaluation of how well an astronaut must
be restrained in weightlessness to apply a large amount of tightening
to a bolt using the tools provided. In addition, the spacewalkers
will use a large tool onboard Discovery for use in case of a problem
with the ACTS/TOS satellite's deployment to evaluate methods of using
bulky tools.
As is the rule with the test spacewalks, the STS-51 EVA will be
one of the lowest priorities of the flight, subject to cancellation
if needed due to a problem with one of the primary payloads. It is
planned with a minimum of extra equipment flown on Discovery, making
optimum use of materials already aboard for other purposes.
The planned spacewalk will be the third such test spacewalk this
year. Previous spacewalk tests were conducted on STS-54 in January
and STS-57 in June. NASA plans to continue adding spacewalks to
Shuttle flights when they can be performed without interference to
the primary activities onboard. The STS-51 spacewalk is the final
test EVA planned for 1993. The spacewalks planned for STS-61 in
December will be performed to service the HST and not for test
purposes.
Source:NASA Spacelink Modem:205-895-0028 Internet:192.149.89.61
=--=--=-END-=--=--=