Spacewalkers Steven Swanson and Richard Arnold attached the S6 solar array truss segment to the international space station today, plugged in power and data cables, unlocked a set of radiator panels and coaxed two mast canisters and blanket boxes into position for array deployment Friday.

They had to apply a bit of elbow grease to get the mast canisters and their beta gimbal assemblies rotated into position and in one case, only three of four support masts could be locked in place. But that was sufficient and mission control told the astronauts to press on.

"We can confirm that we have the other three confirmed locked," astronaut Joseph Acaba radioed from inside Discovery. "So we show ourselves in a good config."

"We did copy all of that discussion," replied Lucia McCullough from Houston. "We are good to proceed."

Swanson and Arnold then rotated solar array blanket boxes into position for deployment, removed thermal covers from electrical components and jettisoned them overboard as planned.

Before wrapping up the excursion, Swanson asked to double-check the unlatched support bar and to take pictures if he was unable to coax it into its final position.

"I tried to pull that pin out," he reported. "It did not move. I tried to get a little leverage on it and I still could not get it to move. And so it seems to be just kind of stuck in a halfway spot."

Flight controllers re-confirmed the array canister was firmly supported with three locked bars and the astronauts began collecting their tools before heading back to the airlock.

The final task on today's agenda was deployment of a folded set of radiator panels the spacewalkers unlatched earlier. The radiator appeared to unfold normally.

Swanson and Arnold began repressurizing the space station's Quest airlock module at 7:23 p.m. EDT, officially ending the successful spacewalk.

"Swanee and Ricky, you guys just did a fantastic job today. Right now, we're looking at about six hours, so it was really good work," Acaba radioed. "And Houston, thanks for all your support. Couldn't have done it without you."

"Hey, we just echoed that," McCullough called from mission control. "That was outstanding. For you and the rest of the combined crew, we're delighted to accept delivery and installation of the S6 truss."

Said space station commander MIke Fincke: "I just wanted to say welcome back aboard the space station. It's a lot bigger than when you left it. Great job out there. You guys were outstanding. Thanks for the hard work."

Today's spacewalk began at 1:16 p.m. and ran six hours and seven minutes, ending 23 minutes ahead of schedule. This was the 121st spacewalk devoted to station assembly and maintenance, the second so far this year and the first of three planned by Discovery's crew. Total EVA construction time now stands at 762 hours and three minutes, or nearly 32 days.

Additional coverage for subscribers:
VIDEO: WALKTHROUGH OF SPACEWALK NO. 1 PLAN PLAY
VIDEO: OVERVIEW OF THE STARBOARD 6 TRUSS PAYLOAD PLAY
VIDEO: NARRATED ANIMATION OF TRUSS INSTALLATION PLAY

VIDEO: FLIGHT DAY 4 HIGHLIGHTS MOVIE PLAY
VIDEO: WEDNESDAY'S MISSION STATUS BRIEFING PLAY
VIDEO: PREVIEW ANIMATION OF S6 TRUSS UNBERTHING PLAY
VIDEO: NARRATED TOUR OF DISCOVERY'S PAYLOAD BAY PLAY

VIDEO: FLIGHT DAY 3 HIGHLIGHTS MOVIE PLAY
VIDEO: TUESDAY'S MISSION STATUS BRIEFING PLAY
VIDEO: SHUTTLE CREW WELCOMED ABOARD STATION PLAY
VIDEO: SPACE SHUTTLE DISCOVERY DOCKS TO SPACE STATION PLAY
VIDEO: SHUTTLE'S POINT OF VIEW DURING BACKFLIP PLAY
VIDEO: DISCOVERY PERFORMS 360-DEGREE BACKFLIP PLAY
VIDEO: PREVIEW ANIMATION OF RENDEZVOUS AND DOCKING PLAY

VIDEO: FLIGHT DAY 2 HIGHLIGHTS MOVIE PLAY
VIDEO: MONDAY'S MISSION STATUS BRIEFING PLAY
VIDEO: MONDAY'S MISSION MANAGEMENT TEAM UPDATE PLAY
VIDEO: PREVIEW ANIMATION OF HEAT SHIELD INSPECTIONS PLAY

VIDEO: FLIGHT DAY 1 HIGHLIGHTS MOVIE PLAY
VIDEO: THE FULL STS-119 LAUNCH EXPERIENCE PLAY
VIDEO: LAUNCH REPLAY: EXTERNAL TANK CAMERA PLAY
VIDEO: LAUNCH REPLAY: VAB ROOF PLAY
VIDEO: LAUNCH REPLAY: CAMERA CS-1 PLAY
VIDEO: LAUNCH REPLAY: CAMERA CS-2 PLAY
VIDEO: LAUNCH REPLAY: CAMERA CS-6 PLAY
VIDEO: LAUNCH REPLAY: FRONT CAMERA PLAY
VIDEO: LAUNCH REPLAY: BEACH TRACKER PLAY
VIDEO: LAUNCH REPLAY: PAD PERIMETER PLAY
VIDEO: LAUNCH REPLAY: PLAYALINDA BEACH PLAY
VIDEO: LAUNCH REPLAY: THE VIP VIEWING SITE PLAY
VIDEO: LAUNCH REPLAY: PRESS SITE PLAY
VIDEO: LAUNCH REPLAY: WEST TOWER PLAY
VIDEO: LAUNCH REPLAY: CAMERA 009 PLAY

VIDEO: SPACE SHUTTLE DISCOVERY BLASTS OFF PLAY
VIDEO: SHUTTLE'S CREW MODULE HATCH CLOSED FOR FLIGHT PLAY
VIDEO: MISSION SPECIALIST STEVE SWANSON BOARDS PLAY
VIDEO: PILOT TONY ANTONELLI BOARDS DISCOVERY PLAY
VIDEO: COMMANDER LEE ARCHAMBAULT BOARDS PLAY
VIDEO: CREW DEPARTS QUARTERS FOR LAUNCH PAD PLAY
VIDEO: ASTRONAUTS DON SPACESUITS FOR LAUNCH PLAY
VIDEO: TIME-LAPSE OF SUNRISE AT LAUNCH PAD 39A PLAY
VIDEO: TIME-LAPSE OF HYDROGEN ACCESS ARM RETRACTION PLAY
VIDEO: TIME-LAPSE OF SATURDAY NIGHT'S GANTRY ROLLBACK PLAY
VIDEO: SATURDAY'S PRE-LAUNCH NEWS CONFERENCE PLAY
VIDEO: FRIDAY'S SHUTTLE AND WEATHER UPDATE BRIEFING PLAY

VIDEO: POST-SCRUB NEWS CONFERENCE PLAY
VIDEO: DISCOVERY IN THE PREDAWN DARKESS PLAY | HI-DEF
VIDEO: WEDNESDAY'S ROLLBACK OF PAD GANTRY PLAY | HI-DEF
VIDEO: TIME-LAPSE OF PAD GANTRY ROLLING BACK PLAY
VIDEO: THE PRE-LAUNCH NEWS CONFERENCE PLAY
VIDEO: ASTRONAUTS ARRIVE IN FLORIDA FOR LAUNCH PLAY
VIDEO: POST-ARRIVAL COMMENTS FROM THE CREW PLAY | HI-DEF

VIDEO: FLIGHT READINESS REVIEW BRIEFING PLAY

VIDEO: SECOND LAUNCH POSTPONEMENT BRIEFING PLAY

VIDEO: NARRATED MISSION OVERVIEW MOVIE PLAY
VIDEO: MEET SHUTTLE DISCOVERY'S ASTRONAUTS PLAY
VIDEO: INTERVIEW WITH COMMANDER LEE ARCHAMBAULT PLAY
VIDEO: INTERVIEW WITH PILOT TONY ANTONELLI PLAY
VIDEO: INTERVIEW WITH MS1 JOE ACABA PLAY
VIDEO: INTERVIEW WITH MS2 STEVE SWANSON PLAY
VIDEO: INTERVIEW WITH MS3 RICKY ARNOLD PLAY
VIDEO: INTERVIEW WITH MS4 JOHN PHILLIPS PLAY
VIDEO: INTERVIEW WITH MS5 KOICHI WAKATA PLAY

VIDEO: NASA OFFICIALS ANNOUNCE LAUNCH DELAY PLAY
VIDEO: SPACE STATION'S VIBRATIONS DURING REBOOST PLAY

VIDEO: INFORMAL NEWS CONFERENCE AT RUNWAY PLAY
VIDEO: ASTRONAUTS ARRIVE FOR PRACTICE COUNTDOWN PLAY

VIDEO: DISCOVERY POSITIONED ATOP PAD 39A PLAY | HI-DEF
VIDEO: EARLY MORNING ROLLOUT FROM THE VAB PLAY | HI-DEF
VIDEO: TIME-LAPSE MOVIE OF DISCOVERY ARRIVING AT PAD 39A PLAY

VIDEO: DISCOVERY HOISTED FOR ATTACHMENT TO TANK PLAY | HI-DEF
VIDEO: CRANE ROTATES DISCOVERY VERTICALLY PLAY | HI-DEF
VIDEO: DISCOVERY MOVES TO ASSEMBLY BUILDING PLAY | HI-DEF
VIDEO: NOSE WHEEL LANDING GEAR RETRACTED PLAY | HI-DEF

VIDEO: TIME-LAPSE MOVIE OF DISCOVERY GOING VERTICAL PLAY
VIDEO: TIME-LAPSE MOVIE OF ASSEMBLY BUILDING CRANE WORK PLAY
VIDEO: TIME-LAPSE MOVIE OF DISCOVERY'S TRIP TO VAB PLAY
VIDEO: TIME-LAPSE MOVIE OF PAYLOAD'S MOVE PLAY

VIDEO: SHUTTLE AND STATION PROGRAM UPDATE PLAY
VIDEO: STS-119 MISSION OVERVIEW BRIEFING PLAY
VIDEO: PREVIEW BRIEFING ON MISSION'S SPACEWALKS PLAY
VIDEO: THE ASTRONAUTS' PRE-FLIGHT NEWS BRIEFING PLAY
MORE: STS-119 VIDEO COVERAGE
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