STS-84
delivered U.S. astronaut Mike Foale to Mir and brought back to Earth
astronaut Jerry Linenger. The crews transferred 249 items between the
two spacecraft, including approximately 7,500 pounds of water, experiment
samples, supplies, and hardware. Included in the exchange were Elektron
oxygen-generating units. These were especially important after the fire
that had occurred during Linengers residency, and the Shuttle proved
again that one of its main values is in bringing back from orbit faulty
equipment for testing and analysis.
The May 15, 1997, predawn liftoff was perfect, after a flawless countdown
and no unplanned "holds." Atlantis roared into orbit
normally; and, as it began to pursue Mir, the STS-84 crew busied themselves
with docking preparation activities. They installed the centerline camera
in the Orbiter docking system, extended the capture ring on the docking
system, and tested the handheld laser device used for range and closure
rates with Mir. The crew also began activities with Biorack, their main
science activity.
On
May 17, Atlantis completed the U.S.s sixth docking with Mir.
Commander Charlie Precourt greeted Mir-23 Commander Vasily Tsibliev
before the Shuttle crewmembers floated into Mirs core module (Base
Block) for a welcoming ceremony. After setting up tubes from Atlantis
to help ventilate Mir, the 10 crewmembers shared a meal before getting
back to a full day of work. In addition to transferring materials, astronauts
continued working on the Biorack facility and the Mir structural dynamics
experiments, which gathered data on the effects of firing thrusters
on either the Shuttle or the Mir.
The official handover from Linenger to Foale came on May 18, when Foale,
Linenger, and Commander Tsibliev installed Foales seat-liner in the
Russian Soyuz capsule. Foale told Mission Control in Houston, "Your
NASA-5 crewmember would like to report that he has fully switched over
to the Mir side." Linenger added, "I stand relieved of duties
on the Mir. Its good to be back on U.S. soil."
The
crews took time to share an international dinner with foods from the
homelands of crewmembers: Russia, Peru, France, Britain, China, and
the United States. Commander Precourt, who speaks several languages,
later said that sharing meals is rare on Shuttle flights. "So,
on -84, that was one of the things I insisted [on], that we find the
time in the flight plan for both the Russian flight controllers and
the American flight controllers
to leave us totally alone. With this
one meal, I made sure they gave us this total freedom to be together
for about
two hours; and it was just a really, really memorable experience."
For his own contribution, Precourt brought Texas barbecue to the meal.
Hatches between the two spacecraft were closed on May 21, setting the
stage for the undocking at around 9 p.m. EDT. The initial separation
was performed by springs that gently pushed the Shuttle away from the
docking module, placing it in a "free-drift" mode. Once the
docking mechanisms springs pushed the Shuttle to a distance of about
two feet, the Shuttles steering jets were fired to begin slowly moving
away from Mir.
Atlantis then continued to a distance of approximately 3,000 feet below
Mir, where it stopped to test a European laser-docking sensor before
continuing its journey back to Earth.
Read
more about the STS-84 mission and crew.
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Chapter - NASA-5 Michael Foale:
Collision and Recovery!