SUBMITTED BY ARTHUR N1ORC - AMSAT A/C #31468

The Atlantis crew arrived at NASA's Kennedy Space Center in Florida today to begin final preparations for mission STS-115. Flying T-38 trainer jets, the astronauts landed at the Shuttle Landing Facility at 11:30 a.m. EDT.

Commander Brent Jett introduced the crew and spoke briefly about the upcoming mission to the International Space Station. "Speaking for myself and my fellow crewmates, I can assure you that we are ready for the challenge and we're ready to restart the assembly sequence." He added, "We have a saying back in Texas: 'It's time to walk the walk.' "

Mission Specialist Joe Tanner expressed the crew's appreciation to all the space workers who have worked tirelessly to prepare for the mission, adding, "When we climb aboard Atlantis on Sunday, we do so with confidence that the vehicle is ready, prepared by the best technicians, engineers and managers in the business."

Later today, Jett and Pilot Chris Ferguson will return to the runway to practice landings in the Shuttle Training Aircraft.

The countdown officially began at noon EDT today, at the T-43 hour mark. The countdown includes about 36 hours of built-in hold time prior to a targeted 4:30 p.m. EDT launch on Sunday; it is the middle point in the launch window that extends for 10 minutes.

At the 10 a.m. Countdown Status Briefing, NASA Test Director Steve Payne reported that the launch team is working no issues, saying, "Atlantis is in excellent shape and we're on track for the preparations for Sunday's launch to bring the P3 and P4 truss to the orbiting space station and return her crew safely home."

STS-115 Payload Manager Robbie Ashley expressed satisfaction that the P3/P4 segment would be joined to the space station soon, adding, "it's been a long time coming." He said, "We're anxious to see them get on orbit and perform the job they were intended to do."

Shuttle Weather Officer Kathy Winters provided a generally positive outlook for launch day conditions. "Overall the weather is looking pretty good for launch day. We do have a 30 percent chance of weather prohibiting tanking in the morning," she said. "We have a 30 percent chance of weather prohibiting launch." She added, "Generally, pretty good weather when it comes to an afternoon summertime day here in Florida."

The next status briefing is scheduled for 10 a.m. EDT Friday and will be carried live on NASA TV. + Watch NASA TV http://www.nasa.gov/multimedia/nasatv/index.html

The STS-115 crew consists of Commander Brent W. Jett Jr., Pilot Christopher J. Ferguson and Mission Specialists Heidemarie M. Stefanyshyn-Piper, Joseph R. Tanner, Daniel C. Burbank and Steven G. MacLean, who represents the Canadian Space Agency. + Learn more about the crew http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts115/index.html

With this mission, NASA is ready to get back to building the International Space Station, marking the first time in almost four years that a space station component has been added to the orbiting outpost. That also means the shuttle program is coming up on some of the most challenging space missions ever. + Learn more about the mission http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts115/mission_overview.html

During their three spacewalks, crew members of Atlantis will install the P3/P4 integrated truss and a second set of solar arrays on the space station, doubling the station’s current ability to generate power from sunlight and adding 17.5 tons to its mass. + Learn more about the truss http://www.nasa.gov/mission_pages/station/behindscenes/truss_segment.html