Astronauts Alvin Drew and Stephen Bowen prepared for a final spacewalk Wednesday, a planned 6.5-hour excursion to carry out a variety of maintenance tasks outside the International Space Station.

Credit: Spaceflight Now/NASA

Floating in the Quest airlock module, Drew and Bowen plan to switch their spacesuits to battery power at 10:18 a.m. EST (GMT-5) to officially begin the Discovery crew's second and final spacewalk.

For identification, Bowen, call sign EV-1, is wearing a suit with red stripes around the legs. Drew, EV-2, is wearing an unmarked suit.

This will be the 155th spacewalk devoted to station assembly and maintenance since construction began in 1998, the fourth so far this year, the second for Drew and the seventh for Bowen. Assuming the EVA runs the full six-and-a-half hours, Bowen will move up to sixth on the list of most experienced spacewalkers.

The goals of today's spacewalk are to vent residual ammonia from a failed pump module that was mounted in a storage enclosure during the crew's first spacewalk Monday; to install a camera and protective lens cover on a Canadian robot arm extension; to attach a protective lens cover to a camera on the station's robot arm; to retrieve an experiment mounting platform; to install a light on a crew equipment cart; and to conduct a variety of other maintenance tasks.

"The first order of business will be to go to the pump module, the ammonia pump that failed last summer on the space station," said space station Flight Director Chris Edelen. "That pump module was transferred on EVA-1 down to a stowage platform next to the airlock. It's being configured for return (to Earth) this summer.

"So they're going to go down to the pump module, and there is an ammonia venting line that's already been hooked up and (Drew will) throw the valve on that and vent the few pounds of residual ammonia that remain in that pump module."

To make sure no ammonia gets on the crew's spacesuits, a hose is in place "that stretches from the pump module to a point well away from either of the spacewalkers," Edelen said.

"It'll be pointed down toward the Earth so it will not be spraying anywhere near the spacewalkers. And as a final precaution, we've arranged for this activity to take place at the beginning of the EVA so if they do get inadvertently sprayed with some ammonia, there'll be time to allow that to sublimate, that's evaporation in a vacuum, so that ammonia will dissipate into space harmlessly."

The pump module is scheduled to be returned to Earth aboard the shuttle Atlantis during the final planned shuttle flight this summer.

While Drew vents the pump module, Bowen, anchored to the end of the station's robot arm, will retrieve a no-longer-needed equipment platform from the European Columbus laboratory module and move it to Discovery's cargo bay for return to Earth.

Drew, meanwhile, will remove no-longer-needed insulation on a newly installed cargo pallet on the right side of the station's power truss and install a light on a crew equipment cart mounted on the front side of the truss.

After mounting the equipment carrier in the shuttle's cargo bay, Bowen will head to the forward Harmony module where a Canadian robot arm extension, called the special purpose dexterous manipulator, or DEXTRE, is mounted.

"The crew will be installing a second camera on DEXTRE, our robot that lives on the outside of the station," Edelen said. "He has two arms and two hands that can do all kinds of external maintenance tasks and he has right now one eye on one side of his body.

"So we're going to put (on) another eye ... a camera that can pan and tilt and move around, which will give the robotics operators better visibility when they're using DEXTRE. The crew will also be installing some transparent, protective lenses over several of the cameras on our robotic arm and on DEXTRE."

Bowen also will remove no-longer-needed insulation from the robot.

A variety of other general maintenance tasks are planned, including work by Drew to tighten a loose fixture on the left side of the power truss that would be needed if a coolant system radiator needs service in the future. The excursion is scheduled to last six-and-a-half hours, followed by a mission status briefing at 7 p.m.

Here is an updated timeline of the crew's activities for flight day seven (in EST and mission elapsed time; includes rev. F of the NASA TV schedule; Bowen is EV-1 and Drew is EV-2):

DATE/EST...DD...HH...MM...EVENT

03/02
05:23 AM...05...12...30...Crew wakeup
06:03 AM...05...13...10...EVA-2: Airlock repress/hygiene break
06:43 AM...05...13...50...ISS daily planning conference
06:53 AM...05...14...00...EVA-2: Airlock depress to 10.2 psi
07:13 AM...05...14...20...EVA-2: EVA prep
08:28 AM...05...15...35...PMM 1A3 'front fence' removal
08:43 AM...05...15...50...EVA-2: Spacesuit purge
08:58 AM...05...16...05...EVA-2: Spacesuit prebreathe
09:33 AM...05...16...40...PMM vestibule CPA removal
09:48 AM...05...16...55...EVA-2: Crew lock depressurization
10:18 AM...05...17...25...EVA-2: Spacesuits to battery power
10:23 AM...05...17...30...EVA-2: Airlock egress
10:33 AM...05...17...40...Lab 1P1 ZSR relocate
10:48 AM...05...17...55...EVA-2/EV-1: Robot arm (SSRMS) setup
10:48 AM...05...17...55...EVA-2/EV-2: Vent ops/QD back C/U
11:48 AM...05...18...55...EVA-2/EV-1: Platform retrieval from Columbus
11:48 AM...05...18...55...EVA-2/EV-2: ELC-4 avionics insulation removal
12:18 PM...05...19...25...EVA-2/EV-1: Equipment platform install
12:18 PM...05...19...25...EVA-2/EV-2: Jettison stowage bag pickup
12:38 PM...05...19...45...EVA-2/EV-2: P3 CETA light install
12:48 PM...05...19...55...EVA-2/EV-1: DEXTRE camera install
01:23 PM...05...20...30...EVA-2/EV-1: DEXTRE insulation removal
01:38 PM...05...20...45...EVA-2/EV-2: Port valve module bootie install
01:48 PM...05...20...55...EVA-2/EV-1: SSRMS cleanup
01:58 PM...05...21...05...EVA-2/EV-2: P1 grapple beam troubleshooting
02:48 PM...05...21...55...EVA-2/EV-1: SSRMS elbow camera cover install
03:08 PM...05...22...15...EVA-2/EV-2: Node 3 insulation removal
03:08 PM...05...22...15...EVA-2/EV-1: P1 grapple beam troubleshooting
03:13 PM...05...22...20...PMM 1F2 fence removal
03:43 PM...05...22...50...EVA-2/EV-1: DEXTRE lens cover
03:43 PM...05...22...50...EVA-2/EV-2: POA protective cover
04:03 PM...05...23...10...EVA-2: Get aheads
04:18 PM...05...23...25...EVA-2: Cleanup and ingress
04:48 PM...05...23...55...EVA-2: Airlock repressurization
04:58 PM...06...05...00...Spacesuit servicing
06:08 PM...06...01...15...ISS daily planning conference
07:00 PM...06...02...07...Mission status briefing on NTV
08:23 PM...06...03...30...ISS crew sleep begins
08:53 PM...06...04...00...STS crew sleep begins
09:00 PM...06...04...07...Daily highlights reel (repeated hourly)

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VIDEO: NARRATED PREVIEW OF SPACEWALK NO. 2 PLAY | HI-DEF

VIDEO: FLIGHT DAY 6 HIGHLIGHTS MOVIE PLAY
VIDEO: SEATTLE AND HOUSTON TV INTERVIEWS WITH CREW PLAY
VIDEO: TUESDAY'S MISSION STATUS BRIEFING PLAY
VIDEO: 'NO GO' FOR SPACE STATION PHOTO OP PLAY
VIDEO: PERMANENT MULTIPURPOSE MODULE ATTACHED PLAY
VIDEO: ROBOT ARM MANEUVERS MODULE TO ITS NEW HOME PLAY
VIDEO: STATION'S NEW MODULE UNBERTHED FROM SHUTTLE PLAY
VIDEO: ROBOT ARM GRAPPLES MODULE ABOARD DISCOVERY PLAY
VIDEO: ORBITAL SUNRISE OVER PMM BEFORE LEAVING SHUTTLE PLAY
VIDEO: TUESDAY MORNING FLIGHT DIRECTOR INTERVIEW PLAY
VIDEO: ANIMATED EXPLANATION OF NEW MODULE PLAY | HI-DEF
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VIDEO: LAUNCH REPLAY: LOOKING OUT THE PILOT'S WINDOW PLAY

VIDEO: FLIGHT DAY 5 HIGHLIGHTS MOVIE PLAY
VIDEO: MONDAY'S MISSION STATUS BRIEFING PLAY
VIDEO: DISCOVERY'S FLIGHT EXTENDED ONE DAY PLAY
VIDEO: EVA NO. 1 CONCLUDES PLAY
VIDEO: JAPANESE "MESSAGE IN A BOTTLE" CAPTURES SPACE PLAY
VIDEO: FAILED PUMP COVERED UP WITH THERMAL BLANKET PLAY
VIDEO: GRAPPLE FIXTURE MOVED FROM PUMP TO OTHER SPARE PLAY
VIDEO: AMMONIA VENTING TOOLS ATTACHED TO FAILED PUMP PLAY
VIDEO: BOLTS ENGAGED TO HOLD OLD PUMP IN STORAGE BOX PLAY
VIDEO: FAILED PUMP MODULE FINALLY PUT INTO ENCLOSURE PLAY
VIDEO: ROBOT ARM SWINGS STEVE BOWEN AROUND THE STATION PLAY
VIDEO: SPACEWALKER HOPS ABOARD STATION'S ROBOT ARM PLAY
VIDEO: MONDAY MORNING FLIGHT DIRECTOR INTERVIEW PLAY
VIDEO: NARRATED PREVIEW OF SPACEWALK NO. 1 PLAY | HI-DEF

VIDEO: FLIGHT DAY 4 HIGHLIGHTS MOVIE PLAY
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VIDEO: TIME-LAPSE OF DISCOVERY MANEUVERING PLAY
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VIDEO: NARRATED PREVIEW OF THE DOCKING PLAY | HI-DEF
VIDEO: GUIDED TOUR OF SHUTTLE'S PAYLOAD BAY PLAY | HI-DEF

VIDEO: FLIGHT DAY 2 HIGHLIGHTS MOVIE PLAY
VIDEO: FRIDAY'S MISSION STATUS BRIEFING PLAY
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VIDEO: LAUNCH REPLAY: VAB ROOF 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 CAMERA 070 PLAY | HI-DEF
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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: WEST TOWER CAMERA PLAY | HI-DEF

VIDEO: ASTRONAUTS LEAVE CREW QUARTERS PLAY | HI-DEF
VIDEO: CREW FINISHES GETTING SUITED UP PLAY | HI-DEF

VIDEO: LOOK BACK AT THE LAUNCH DELAYS PLAY | HI-DEF
VIDEO: NARRATED REVIEW OF SHUTTLE'S PREPARATIONS PLAY | HI-DEF
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VIDEO: TIME-LAPSE OF PAD GANTRY ROLLBACK PLAY
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VIDEO: DISCOVERY'S COUNTDOWN IS UNDERWAY PLAY
VIDEO: LAUNCH COUNTDOWN PREVIEW AND WEATHER FORECAST PLAY
VIDEO: ASTRONAUTS ARRIVE AT LAUNCH SITE AGAIN PLAY | HI-DEF
VIDEO: DISCOVERY CLEARED FOR LAUNCH ON FEB. 24 PLAY

VIDEO: STEVE BOWEN BEGINS CREW TRAINING PLAY | HI-DEF

VIDEO: SUN RISES OVER SPACEPORT AFTER ROLLOUT PLAY | HI-DEF
VIDEO: SHUTTLE ARRIVES ATOP LAUNCH PAD 39A AGAIN PLAY | HI-DEF
VIDEO: CROWDS CHEER ON DISCOVERY'S ROLLOUT PLAY | HI-DEF
VIDEO: DISCOVERY RE-EMERGES FROM THE VAB PLAY | HI-DEF
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VIDEO: FRESH FOAM APPLIED TO EXTERNAL TANK PLAY | HI-DEF

VIDEO: ROOT CAUSE OF SHUTTLE TANK CRACKS FOUND PLAY

VIDEO: REPAIRS AND STRENGTHENING TO TANK PLAY | HI-DEF
VIDEO: DIGITAL X-RAY INSPECTIONS IN THE VAB PLAY | HI-DEF
VIDEO: WORK UNDERWAY TO REMOVE FOAM AND SENSORS PLAY | HI-DEF
VIDEO: SETTING UP ACCESS PLATFORMS AROUND TANK PLAY | HI-DEF

VIDEO: SHUTTLE ROLLED BACK TO ASSEMBLY BUILDING PLAY | HI-DEF
VIDEO: DISCOVERY DEPARTS LAUNCH PAD 39A PLAY | HI-DEF
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VIDEO: HIGHLIGHTS FROM THE FUELING TEST PLAY | HI-DEF
VIDEO: RECAP OF THE FUELING EXERCISE PLAY
VIDEO: FUELING TEST COUNTDOWN UPDATE PLAY
VIDEO: COMMENTS FROM SHUTTLE LAUNCH DIRECTOR PLAY
VIDEO: GROUND UMBILICAL CARRIER PLATE CHECKED PLAY
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VIDEO: GASEOUS HYDROGEN VENT ARM RETURNED PLAY | HI-DEF
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VIDEO: OPENING UP TANK'S ENTRANCE DOOR PLAY | HI-DEF
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VIDEO: DISCOVERY'S PRE-LAUNCH NEWS CONFERENCE PLAY
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VIDEO: THE ASTRONAUTS' PRE-FLIGHT NEWS BRIEFING PLAY

VIDEO: PAYLOAD BAY DOORS CLOSED FOR LAUNCH PLAY | HI-DEF
VIDEO: CREW LEAVES KSC FOR TRIP TO HOUSTON PLAY | HI-DEF
VIDEO: ASTRONAUTS INSPECT THE PAYLOAD BAY PLAY | HI-DEF
VIDEO: SHUTTLE EVACUATION PRACTICE PLAY | HI-DEF
VIDEO: ASTRONAUTS EGRESS SHUTTLE AS SEEN LIVE PLAY
VIDEO: ASTRONAUTS BOARD DISCOVERY PLAY | HI-DEF
VIDEO: SUN RISES ON LAUNCH PAD 39A PLAY | HI-DEF
VIDEO: LAUNCH DAY REHEARSAL BEGINS PLAY | HI-DEF
VIDEO: COMMEMORATIVE WALL SIGNING IN VAB PLAY | HI-DEF
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VIDEO: TEST-DRIVING AN EMERGENCY ARMORED TANK PLAY | HI-DEF

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VIDEO: PRE-LAUNCH INTERVIEW WITH ERIC BOE PLAY
VIDEO: PRE-LAUNCH INTERVIEW WITH AL DREW PLAY
VIDEO: PRE-LAUNCH INTERVIEW WITH TIM KOPRA PLAY
VIDEO: PRE-LAUNCH INTERVIEW WITH MIKE BARRATT PLAY
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VIDEO: PAYLOADS INSTALLED INTO DISCOVERY PLAY | HI-DEF
VIDEO: MISSION PAYLOADS ARRIVE AT LAUNCH PAD PLAY | HI-DEF
VIDEO: CANISTER HAULING PAYLOADS TURNED UPRIGHT PLAY | HI-DEF
VIDEO: MODULE HOISTED INTO SHIPPING CANISTER PLAY | HI-DEF
VIDEO: WEIGHING NEW SPACE STATION MODULE PLAY | HI-DEF

VIDEO: GANTRY PLACED AROUND DISCOVERY PLAY | HI-DEF
VIDEO: SHUTTLE ATLANTIS REACHES PAD 39A PLAY | HI-DEF
VIDEO: CROWDS WATCH DISCOVERY'S FINAL ROLLOUT PLAY | HI-DEF

VIDEO: SHUTTLE HOISTED FOR ATTACHMENT TO TANK PLAY | HI-DEF
VIDEO: CRANE ROTATES THE ORBITER VERTICALLY PLAY | HI-DEF
VIDEO: DISCOVERY DEPARTS ITS HANGAR PLAY | HI-DEF

VIDEO: TIME-LAPSE SHOWS DISCOVERY ASCENDING IN VAB PLAY
VIDEO: TIME-LAPSE SHOWS THE MOVE TO ASSEMBLY BUILDING PLAY

VIDEO: DISCOVERY'S MAIDEN FLIGHT: FIRST TRIP TO VAB PLAY
VIDEO: DISCOVERY'S MAIDEN FLIGHT: ROLLOUT TO PAD 39A PLAY
VIDEO: DISCOVERY'S MAIDEN FLIGHT: TEST-FIRING ENGINES PLAY
VIDEO: DISCOVERY'S MAIDEN FLIGHT: ASSORTED VIEWS OF FRF PLAY

VIDEO: THE HISTORY OF SHUTTLE DISCOVERY PLAY
VIDEO: THE HISTORY OF SHUTTLE ENDEAVOUR PLAY
VIDEO: THE HISTORY OF SHUTTLE ATLANTIS PLAY

VIDEO: INSPECTION OF THE MISSION PAYLOADS PLAY | HI-DEF
VIDEO: ROBONAUT ARRIVES AT KENNEDY SPACE CENTER PLAY | HI-DEF
VIDEO: SPACE STATION'S SPARE THERMAL RADIATOR PLAY | HI-DEF
VIDEO: BLANKETING LEONARDO WITH INSULATION PLAY | HI-DEF
VIDEO: RACK INSERTED INTO LEONARDO FOR LAUNCH PLAY | HI-DEF
VIDEO: LEONARDO RETURNS FROM ITS PREVIOUS FLIGHT PLAY | HI-DEF
VIDEO: STATION'S SPARE PARTS DEPOT ARRIVES PLAY | HI-DEF

VIDEO: ORBITER'S PAYLOAD BAY CLOSED FOR ROLLOUT PLAY | HI-DEF
VIDEO: ASTRONAUTS VISIT THEIR SPACECRAFT PLAY | HI-DEF
VIDEO: CREW INSPECTS LEONARDO MODULE PLAY | HI-DEF
VIDEO: DISCOVERY RECEIVES ITS MAIN ENGINES PLAY | HI-DEF
VIDEO: FUEL TANK MATED TO SOLID ROCKET BOOSTERS PLAY | HI-DEF
VIDEO: HOISTING FUEL TANK INTO CHECKOUT BAY PLAY | HI-DEF
VIDEO: EXTERNAL FUEL TANK UNLOADED FROM BARGE PLAY | HI-DEF
VIDEO: MISSION'S FUEL TANK ARRIVES AT SPACEPORT PLAY | HI-DEF

VIDEO: POST-FLIGHT DESERVICING: OMS POD PLAY | HI-DEF
VIDEO: POST-FLIGHT DESERVICING: OBSS BOOM PLAY | HI-DEF
VIDEO: POST-FLIGHT DESERVICING: ENGINES PLAY | HI-DEF
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