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Submitted by Athur - N1ORC

STS-111, Mission Control Center 
Status Report # 17
Thursday, June 13, 2002 – 5 a.m. CDT

Endeavour spacewalkers Philippe Perrin and Franklin Chang-Díaz will
perform surgery on the International Space Station’s robotic arm today,
attempting to restore full functionality to the space crane through the
replacement of ailing wrist joint. 

Canadarm2 experienced an electrical problem in March in one of two
redundant power and data channels which command the operation of the
seven-jointed apparatus. It was determined that a short created
inadvertent commanding in the arm’s primary channel which resulted in the
unexpected activation of the arm’s brakes. The backup commanding channel
has functioned perfectly. Even though the arm has continued to operate
flawlessly through a software modification, the replacement of the
problematic wrist joint was added to the STS-111 mission. 

Inside the shuttle, Pilot Paul Lockhart will choreograph the planned
seven-hour spacewalk while Commander Ken Cockrell will use the shuttle’s
robotic arm to provide television views of the spacewalk activity. Inside
the station, Endeavour Astronaut Dan Bursch and Expedition Five Commander
Valery Korzun will conduct a checkout of the health of the arm once the
new joint is installed. Expedition Five Flight Engineers Peggy Whitson
and Sergei Treschev will continue cargo transfer activities throughout
the day. 

Each joint of Canadarm2 is attached to the next joint by six bolts and an
additional bolt that disconnects power, data and video connections. The
first task for the spacewalkers is to remove the latching end effector
(LEE), essentially the hand of Canadarm2, leaving the faulty wrist roll
joint exposed. Next they will disconnect the wrist roll joint and Perrin
will carry the failed unit to Endeavour’s payload bay to temporarily
store it next to the new joint. Chang-Díaz will assist in removing the
new joint from its launch carrier and Perrin will bring it up to
Canadarm2. The spacewalkers will align the new component with the wrist
yaw joint at the end of the arm, tighten the six bolts and turn the final
bolt to connect power, data and video lines. They will reinstall the LEE
and power will be turned back onto Canadarm2. 

Endeavour’s astronauts – Cockrell, Lockhart, Chang-Díaz, Perrin, Bursch,
Yury Onufrienko and Carl Walz – were awakened just before 4 a.m. Central
time this morning to the song, “On the Road Again,” by Willie Nelson,
selected for Walz by his family. Walz is returning to Earth after a
six-month stay in orbit. 

All systems on both Endeavour and the International Space Station
continue to function normally as the two craft orbit the Earth every 90
minutes at an altitude of 240 statute miles. 


NASA Johnson Space Center Mission Status Reports 

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