[sarex] STS-115 Astronauts Wrap Up Second Spacewalk
azrowe80 at verizon.net
Wed Sep 13 09:33:53 PDT 2006
SUBMITTED BY ARTHUR N1ORC - AMSAT A/C# 31468
STS-115 Astronauts Wrap Up Second Spacewalk
The second STS-115 spacewalk is now in the history books. STS-115
Mission Specialists Dan Burbank and Steve MacLean concluded the
spacewalk at 12:16 p.m. EDT (1616 UTC) after continued efforts to
prepare the International Space Station’s P3/P4 integrated truss for
The 17.5-ton, 45-foot truss, which contains a set of solar arrays, was
attached to the station Tuesday. The P3/P4 will provide power, data and
communication services for the station. The arrays will be unfurled to a
full length of 240 feet Thursday and will eventually double the
station’s power capabilities.
Burbank and MacLean began their excursion at 5:05 a.m.(0905 UTC) and
proceeded to move through the scheduled activities, which included the
removal of launch locks and launch restraints on the Solar Alpha Rotary
Joint (SARJ). Once activated, the rotary joint will allow the arrays to
track the sun. It will be tested later today.
About 7:10 a.m. EDT, MacLean reported that one of the four bolts on the
cover to SARJ launch lock 8 was missing. The bolt had been there when he
removed the cover to access the lock. MacLean reported he did not see
the bolt in the SARJ mechanism. The cover is secure with three of the
four bolts in place.
Later, the socket being used by MacLean to loosen a stubborn bolt on
launch restraint 6B broke. MacLean retrieved a cheater bar from the tool
box on the Z1 Truss. He broke the torque, but ultimately it took both he
and Burbank to remove the bolt and launch restraint.
During the remainder of the spacewalk, the astronauts were instructed to
perform get-ahead tasks. They prepared of the P3 truss for use by the
Mobile Transporter – a platform that allows the station’s robotic arm,
Canadarm2, to move along the Integrated Truss Structure.
Mission Specialist Joe Tanner served as spacewalk coordinator. Mission
Specialist Heidemarie Stefanyshyn-Piper assisted Tanner and operated
Canadarm2. Tanner and Piper conducted the first spacewalk and will
perform the third Friday.
More information about the SAREX