Additional egress into space is scheduled on June 25.

June 17, 2004. Korolev, Moscow Region.

Additional egress into space is scheduled on June 25.

Two nominal egresses into space (EVA) were scheduled in the flight program
of the ISS long duration Expedition Crew 9 (ISS-9), consisting of Gennady
Padalka and Michael Fincke in late July and late August.
However, a failure of the remote electric power control unit of the U.S.
control moment gyroscope (gyrodine) #2, that occurred on April 21 this year,
generated a need for an additional crew EVA.
Currently the ISS attitude control capability is provided by two operable
gyrodines out of four Station-mounted gyrodines and Russian attitude control
jets. Gyrodine #1 already failed on June 6, 2002, and a new unit with regard
to its mass and dimensional properties can be delivered only by the Space
Shuttle. The lost functionality of gyrodine #2 shall be restored in order to
increase a level of the ISS attitude control redundancy.

It was originally presupposed that EVA for restoration of gyrodine #2
functionality would be performed on June 10 in the U.S. EMU spacesuits. All
associated preparatory activities for the crew and ground services were
planned proceeding from this date. However, in the course of preparation it
was discovered that the cooling system in one of the spacesuits did not
work. Per the U.S. suggestion the EVA will be conducted in the Russian
spacesuits Orlan M. This circumstance called for a revision of the EVA
preparation schedule and timeline, since now the crew will have to go to the
gyrodines not from the U.S., but from the Russian Segment of the ISS. The
EVA date was shifted accordingly to June 16.
According to the U.S. medical personnel, the optimal EVA date was June 28,
as in so doing, the crew sleep and work shift schedule is consistent with
the circadian rhythms of the crew physiological activity. It is their
belief, that a disturbance of circadian rhythms will result in a reduced
efficiency of a human activity.

The Russian medical staff is of the opinion that the influence of these
biological factors cannot be so essential. A traditional governing factor in
selecting the EVA date and time in the Russian cosmonautics is the maximum
Russian ground site coverage, that permits a full tracking of the crew
activity and health. This condition could not be satisfied with the EVA
conducted on June 28.
By the U.S. request, joint teams of the Russian and U.S. specialists
conducted a detailed review for selecting a new date of an additional EVA to
be performed by the ISS crew. The joint discussion of the both parties'
requirements led to a compromise decision to perform the EVA on the night of
June 25 Moscow time. The suited crew training earlier slated on June 11 is
deferred to June 22.


--
---------------------------

Jacques :-)

www.spacepatches.info

http://www.spaceref.com/news/viewpr.html?pid=14408

RELEASED: JUNE 17 2004
Johnson Space Center

The crew of the International Space Station (ISS) is about to become
space-age electricians. The Expedition 9 crew, cosmonaut Gennady Padalka
and astronaut Mike Fincke, will perform a spacewalk next week to restore
power to a gyroscope that helps control the Station's orientation in
orbit.
ISS program leaders will discuss the spacewalk with the media Monday at 2
p.m. EDT from NASA's Johnson Space Center, Houston. The briefing will be
broadcast live on NASA TV, with two-way question and answer capability at
participating NASA centers.

Participants:


a.. Mike Suffredini, ISS Manager for Integration and Operations
b.. Matt Abbott, Expedition 9 Lead Flight Director
c.. John Curry, ISS Extravehicular Activity (EVA) Flight Director
d.. Paul Boehm, Expedition 9 Lead EVA Officer

NASA TV will broadcast the EVA live starting at 4:30 p.m. EDT, June 24.
The crew will exit the Station hatch at approximately 5:50 p.m. EDT.