Astronauts Robert Satcher and Randolph Bresnik prepared for a planned five-hour 45-minute spacewalk Monday to install an oxygen tank on the International Space Station's Quest airlock module, set up a materials science space exposure experiment and carry out a variety of station assembly get-ahead tasks.

In two earlier spacewalks, the Atlantis astronauts accomplished several of the tasks planned for the final excursion and flight planners revised the content of the third EVA to include additional get-ahead objectives.

This will be the 136th spacewalk devoted to station assembly and maintenance since construction began in 1998, the 17th this year and the third and final excursion planned by the Atlantis astronauts. It is the second spacewalk for Satcher and Bresnik.

For identification, Satcher's suit is unmarked while Bresnik's features broken stripes around the legs.

"The major task we're going to do is installing the oxygen gas tank so we're bringing up some atmosphere for the space station," Satcher said in a NASA interview. "It comes up actually on ELC-2 (Express Logistics Carrier 2), which is going to be stored all the way out on the end of the space station, on the starboard end.

"So we got to go out, way out there, and get it, coordinate with the robotic arm. We have to take it off of ELC-2, hold it in position for the arm to grapple it and transport it all the way back over to the airlock where we will go and install it. Now, before we can install it there, there's some MMOD shields, which are micrometeorite debris shields, that we [have] got to move out of the way, so we'll be detaching those, moving them out of the way and then we can install the gas tank.

"The other major activity is we'll be deploying these material science experiments called MISSEs. Randy will be getting those out of the cargo bay of the shuttle and bringing those over to ELC-2 where they're installed and deployed."

The oxygen tank installation and MISSE-7 experiment set up are expected to take about three hours to complete. The rest of the excursion will be devoted to assembly get-ahead tasks.

Satcher will loosen a bolt on an ammonia tank assembly that will be replaced later and stow a long "cheater bar" tool outside the station while Bresnik works to connect ammonia fluid line jumpers in the station's cooling system. Satcher then will install insulation to protect power connectors on the railcar that moves the station's robot arm along the main power truss. He also will install a protective cover on a camera at the end of the robot arm. While that work is going on, Bresnik will relocate a foot restraint.

Here is an updated timeline of today's activity (in EST and mission elapsed time; includes revision K of the NASA television schedule):

EST........DD...HH...MM...EVENT

11/23/09
02:28 AM...06...12...00...STS/ISS crew wakeup
03:03 AM...06...12...35...EVA-3: 14.7 psi repress/hygiene break
03:48 AM...06...13...20...EVA-3: Airlock depress to 10.2 psi
04:03 AM...06...13...35...ISS daily planning conference
04:13 AM...06...13...45...EVA-3: Campout EVA preps
05:43 AM...06...15...15...EVA-3: Spacesuit purge
05:58 AM...06...15...30...EVA-3: Spacesuit prebreathe
06:48 AM...06...16...20...EVA-3: Crew lock depressurization
07:18 AM...06...16...50...EVA-3: Spacesuits to battery power
07:23 AM...06...16...55...EVA-3: Airlock egress/setup
07:48 AM...06...17...20...EVA-3: O2 tank transfer and MISSE 7 install
10:48 AM...06...20...20...EVA-3: Airlock debris shields
11:18 AM...06...20...50...EVA-3/Satcher: Ammonia tank bolt torque
11:18 AM...06...20...50...EVA-3/Bresnik: P1/P3 jumper install
11:38 AM...06...21...10...EVA-3/Satcher: Cheater bar stow
11:48 AM...06...21...20...EVA-3/Bresnik: S1/S3 jumper install
11:53 AM...06...21...25...EVA-3/Satcher: MSS insulation
12:18 PM...06...21...50...EVA-3/Bresnik: Foot restraint 3 relocate
12:33 PM...06...22...05...EVA-3: Contingency time
01:18 PM...06...22...50...EVA-3: Cleanup and ingress
01:48 PM...06...23...20...EVA-3: Airlock repressurization
02:03 PM...06...23...35...Spacesuit servicing
03:13 PM...07...45...00...Evening planning conference
03:30 PM...07...01...02...Mission status briefing on NTV
05:28 PM...07...03...00...ISS crew sleep begins
05:58 PM...07...03...30...STS crew sleep begins
06:00 PM...07...03...32...Daily highlights on NTV
11:30 PM...07...09...02...Flight director update

Additional coverage for subscribers:
VIDEO: PRE-FLIGHT INTERVIEW WITH RANDY AND REBECCA PLAY
VIDEO: BIRTH OF BABY BRESNIK ANNOUNCED FROM ORBIT PLAY
VIDEO: EDUCATIONAL EVENT WITH TENNESSEE TECH UNIVERSITY PLAY
VIDEO: WASHINGTON, TAMPA AND CHICAGO MEDIA INTERVIEWS PLAY
VIDEO: SUNDAY MORNING'S FLIGHT DIRECTOR INTERVIEW PLAY

VIDEO: THE FLIGHT DAY 6 HIGHLIGHTS MOVIE PLAY
VIDEO: SATURDAY'S MISSION STATUS BRIEFING PLAY
VIDEO: SPACEWALKERS INSTALL WIRELESS VIDEO ANTENNA PLAY
VIDEO: MEASUREMENT PROBE RELOCATED ON STATION TRUSSES PLAY
VIDEO: EXPERIMENTAL COMMUNICATION PACKAGE INSTALLED PLAY
VIDEO: SECOND SPARE PARTS PALLET MOVED TO STATION PLAY
VIDEO: STEP-BY-STEP SUMMARY OF SPACEWALK NO. 2 PLAY
VIDEO: PREVIEW OF ACTIVITIES ON FLIGHT DAY 6 PLAY
VIDEO: SATURDAY MORNING'S FLIGHT DIRECTOR INTERVIEW PLAY

VIDEO: THE FLIGHT DAY 5 HIGHLIGHTS MOVIE PLAY
VIDEO: FRIDAY'S MISSION STATUS BRIEFING PLAY
VIDEO: ESPN, BET AND RICHMOND TV INTERVIEWS PLAY
VIDEO: MELVIN AND SATCHER ON MORNING RADIO SHOW PLAY
VIDEO: CBS, NASHVILLE TV AND FOX RADIO INTERVIEWS PLAY

VIDEO: THE FLIGHT DAY 4 HIGHLIGHTS MOVIE PLAY
VIDEO: THURSDAY'S MISSION STATUS BRIEFING PLAY
VIDEO: SPAEWALKERS HAMMER STUCK BRACE ON TRUSS PLAY
VIDEO: MAINTENANCE WORK ON JAPANESE ROBOT ARM PLAY
VIDEO: ENJOYING THE VIEW OF SHUTTLE AND STATION PLAY
VIDEO: REFURBISHED S-BAND ANTENNA INSTALLED PLAY
VIDEO: ASTRONAUTS MOVE ANTENNA FROM SHUTTLE PLAY
VIDEO: SPACEWALK NO. 1 GETS UNDERWAY PLAY
VIDEO: STEP-BY-STEP SUMMARY OF SPACEWALK NO. 1 PLAY
VIDEO: PREVIEW OF ACTIVITIES ON FLIGHT DAY 4 PLAY
VIDEO: THURSDAY MORNING'S FLIGHT DIRECTOR INTERVIEW PLAY

VIDEO: AERIAL LAUNCH AND SRB SPLASHDOWN FOOTAGE PLAY

VIDEO: THE FLIGHT DAY 3 HIGHLIGHTS MOVIE PLAY
VIDEO: WEDNESDAY AFTERNOON'S MANAGEMENT TEAM UPDATE PLAY
VIDEO: SPARE PARTS CARRIER INSTALLED ONTO STATION PLAY
VIDEO: SHUTTLE ARM HANDS PALLET TO STATION'S ARM PLAY
VIDEO: LOGISTICS CARRIER 1 UNBERTHED FROM SHUTTLE PLAY
VIDEO: WEDNESDAY'S MISSION STATUS BRIEFING PLAY
VIDEO: SHUTTLE CREW FLOATS INTO STATION PLAY
VIDEO: ATLANTIS DOCKS TO THE SPACE STATION PLAY
VIDEO: SPACE SHUTTLE PERFORMS 360-DEGREE BACKFLIP PLAY
VIDEO: BEAUTIFUL VIEWS OF ATLANTIS APPROACHING PLAY
VIDEO: SUMMARY OF THE SPARE PARTS PALLETS PLAY
VIDEO: PREVIEW OF PALLET NO. 1 DELIVERY ON FLIGHT DAY 3 PLAY
VIDEO: NARRATED PREVIEW OF RENDEZVOUS AND DOCKING PLAY

VIDEO: THE FLIGHT DAY 2 HIGHLIGHTS MOVIE PLAY
VIDEO: TUESDAY AFTERNOON'S MANAGEMENT TEAM UPDATE PLAY
VIDEO: ROBOT ARM GRAPPLES LOGISTICS CARRIER 1 PLAY
VIDEO: TUESDAY AFTERNOON'S MISSION STATUS BRIEFING PLAY
VIDEO: PREVIEW OF ACTIVITIES ON FLIGHT DAY 2 PLAY
VIDEO: NARRATED TOUR OF THE PAYLOAD BAY PLAY

VIDEO: THE FLIGHT DAY 1 HIGHLIGHTS MOVIE PLAY
VIDEO: LAUNCH REPLAY: INSIDE MISSION CONTROL ROOM PLAY
VIDEO: LAUNCH REPLAYS: EXTERNAL TANK CAMERA PLAY
VIDEO: POST-LAUNCH PRESS CONFERENCE PLAY

VIDEO: CREW FINISHES GETTING SUITED UP PLAY | HI-DEF
VIDEO: ASTRONAUTS LEAVE CREW QUARTERS PLAY | HI-DEF
VIDEO: LIFTOFF OF SPACE SHUTTLE ATLANTIS! PLAY | HI-DEF

VIDEO: LAUNCH REPLAY: PRESS SITE PLAY | HI-DEF
VIDEO: LAUNCH REPLAY: PAD PERIMETER PLAY | HI-DEF
VIDEO: LAUNCH REPLAY: BEACH TRACKER PLAY | HI-DEF
VIDEO: LAUNCH REPLAY: PAD CAEMRA 070 PLAY | HI-DEF
VIDEO: LAUNCH REPLAY: PAD CAEMRA 071 PLAY | HI-DEF
VIDEO: LAUNCH REPLAY: WEST TOWER SITE PLAY | HI-DEF
VIDEO: LAUNCH REPLAY: UCS-23 TRACKER PLAY | HI-DEF
VIDEO: LAUNCH REPLAY: PLAYALINDA BEACH PLAY | HI-DEF
VIDEO: LAUNCH REPLAY: PAD FRONT CAMERA PLAY | HI-DEF
VIDEO: LAUNCH REPLAY: VAB ROOF PLAY | HI-DEF

VIDEO: NARRATED REVIEW OF SHUTTLE'S PREPARATIONS HI-DEF
VIDEO: NARRATED REVIEW OF PAYLOADS' PREPARATIONS HI-DEF

VIDEO: STUNNING SUNSET ROLLBACK OF PAD GANTRY PLAY | HI-DEF
VIDEO: A LOOK AT SPACE STATION SCIENCE RESEARCH PLAY
VIDEO: THE STS-129 PRE-LAUNCH PRESS CONFERENCE PLAY
VIDEO: COUNTDOWN PREVIEW AND WEATHER BRIEFING PLAY
VIDEO: ASTRONAUTS ARRIVE FOR LAUNCH PLAY | HI-DEF

VIDEO: NARRATED MISSION OVERVIEW MOVIE PLAY | HI-DEF
VIDEO: MEET SHUTTLE ATLANTIS' ASTRONAUTS PLAY | HI-DEF

VIDEO: ASTRONAUTS TOUR PAD'S CLEANROOM PLAY | HI-DEF
VIDEO: SHUTTLE EVACUATION PRACTICE PLAY | HI-DEF
VIDEO: CREW BOARDS SHUTTLE FOR TEST PLAY | HI-DEF
VIDEO: THE LAUNCH DAY SIMULATION BEGINS PLAY | HI-DEF
VIDEO: CREW ARRIVES FOR PRACTICE COUNTDOWN PLAY | HI-DEF

VIDEO: PAYLOADS DELIVERED TO PAD 39A PLAY | HI-DEF
VIDEO: PLACING PAYLOADS INTO TRANSPORTER PLAY | HI-DEF

VIDEO: FLIGHT READINESS REVIEW SETS LAUNCH DATE PLAY

VIDEO: CREW BRIEFED ON EMERGENCY PROCEDURES PLAY | HI-DEF
VIDEO: TEST-DRIVING EMERGENCY ARMORED TANK PLAY | HI-DEF
VIDEO: CREW ARRIVES AT CAPE FOR TRAINING PLAY | HI-DEF

VIDEO: SHUTTLE AND STATION PROGRAM UPDATE PLAY
VIDEO: THE STS-129 MISSION OVERVIEW BRIEFING PLAY
VIDEO: PREVIEW BRIEFING ON MISSION'S SPACEWALKS PLAY
VIDEO: THE ASTRONAUTS' PRE-FLIGHT NEWS BRIEFING PLAY

VIDEO: SPACE SHUTTLE ROLLOUT IN FAST-FORWARD PLAY | HI-DEF
VIDEO: ATLANTIS TAKES PERCH ATOP PAD 39A PLAY | HI-DEF
VIDEO: ROLLOUT FROM ASSEMBLY BUILDING BEGINS PLAY | HI-DEF
VIDEO: SPACE SHUTTLE ASSEMBLY IN FAST-FORWARD PLAY | HI-DEF
VIDEO: TIME-LAPSE OF ATLANTIS ATTACHED TO FUEL TANK PLAY
VIDEO: ATLANTIS LEAVES HANGAR FOR NEXT LAUNCH PLAY | HI-DEF
VIDEO: TIME-LAPSE OF ATLANTIS ARRIVING IN VAB PLAY
VIDEO: CLOSING ATLANTIS' PAYLOAD BAY DOORS PLAY | HI-DEF
VIDEO: FUEL TANK ATTACHED TO SOLID ROCKETS PLAY | HI-DEF
VIDEO: ASTRONAUTS MAKE A VISIT TO THE CAPE PLAY | HI-DEF
VIDEO: ORBITER DOCKING SYSTEM CHECKED OUT PLAY | HI-DEF
VIDEO: ATLANTIS' FUEL TANK UNLOADED FROM BARGE PLAY | HI-DEF
VIDEO: EXTERNAL TANK ARRIVES AT THE LAUNCH SITE PLAY | HI-DEF
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