It's spacewalk No. 2 for NASA's 1-year spaceman

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CAPE CANAVERAL, Fla. (AP) — NASA's one-year spaceman, Scott Kelly, ventured back outside the International Space Station on Friday morning for some radiator work.

It was the second spacewalk in 1 1/2 weeks for Kelly, who's more than halfway through a U.S. record-setting yearlong flight, and fellow American astronaut Kjell Lindgren. They got started an hour early, eager to make the home improvements.

SEE ALSO: Astronaut takes spacewalk right before setting US record

"Going off grid for spacewalk," Kelly said via Twitter before heading out. "I'll be back w you again soon!"

Friday's excursion involved work on the space station's cooling system. The spacewalkers needed to undo jury-rigged repairs made to a leaky cooling line three years ago. The ammonia leak subsequently was fixed another way — by replacing a failed pump — so NASA wanted the system back in its original setup.

See photos from Scott Kelly's #YearInSpace:

56 PHOTOS
Astronaut Scott Kelly's #YearInSpace in tweets
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It's spacewalk No. 2 for NASA's 1-year spaceman
On the grid! Back from #spacewalk & tweet ability down. Real-life lesson in importance of connectivity. #YearInSpace https://t.co/VMc1VwRhzZ
For an instant before sunrise, the space station glows orange. #GoodMorning from @Space_Station! #YearInSpace https://t.co/FEXx8Rezg3
Day 222. Sleep by the light of the #moon. #GoodNight from @space_station! #YearInSpace https://t.co/WOP7jjs7mb
Day 219. The #sun will come out 16 times tomorrow. #GoodNight from @space_station! #YearInSpace https://t.co/jvQp2fkV4O
Day 218 Bewitching hour on #Earth. Have fun, be safe. #HappyHalloween & #GoodNight from @space_station! #YearInSpace https://t.co/5Uj6fWHte0
#Halloween #EarthArt Some places of our world look other worldly. Boo! #YearInSpace https://t.co/CwT86NtR5Y
#Halloween #EarthArt Ghostly and dark but beautiful too. #YearInSpace https://t.co/uaHGt9jk6g
#TropicalStorm #Ashobaa churns off the coast of #Oman. Stay safe down there. #YearInSpace https://t.co/7047MGIymT
Day 216. Seeing our world in a new light tonight. #GoodNight from @space_station! #YearInSpace https://t.co/ih0wnSQXyG
#SpaceWalkSelfie Back on the grid! Great first spacewalk yesterday. Now on to the next one next week. #YearInSpace https://t.co/7qXLiKzaKA
Day 211. Night calling #SouthAfrica like it is calling me. #GoodNight from @space_station! #YearInSpace https://t.co/xK4FJlh9ei
Hurricane #Patricia approaches #Mexico. It's massive. Be careful! #YearInSpace https://t.co/F5LgnjOjey
Great Scott!10/21/15! Fly cars? I live in a flying house! 17,500MPH in 1.21 Jigawatts over Hill Valley, CA #BTTF2015 https://t.co/PAErx6PaQI
The area to the North and East of the #Himalayas is strikingly beautiful. #YearInSpace http://t.co/QEHLK2PcIX
The atmosphere sometimes she glows. #GoodMorning from @Space_Station! #YearInSpace http://t.co/dQ93kZbwpw
#EarthArt Across the Greatest Desert- #Sahara #YearInSpace http://t.co/1OW6IZNGKJ
#EarthArt A single pass over the #Australian continent. Picture 15 of 17. #YearInSpace http://t.co/ESzOODFzB2
Day 200. Sometimes a little light makes all the difference. #GoodNight from @Space_Station #YearInSpace http://t.co/qkFtdtKLkb
#EarthArt A single pass over the #Australian continent. Picture 10 of 17. #YearInSpace http://t.co/NjwuEzgD0Z
#EarthArt in one pass over the #Australian continent. Picture 1 of 17. #YearInSpace http://t.co/LvQCauUEpT
The daily morning dose of #aurora to help wake you up. #GoodMorning from @Space_Station! #YearInSpace http://t.co/Ar6ScCbUPo
#Houston, looks like great weather down there! Although, I'd be fine with any weather. #GoodMorning! #YearInSpace http://t.co/07GQFT4vrM
Day 191. From one #sunrise to the next. Good night from @space_station! #YearInSpace http://t.co/iablXOZO1g
Early morning shot of Hurricane #Joaquin from @space_station before reaching #Bahamas. Hope all is safe. #YearInSpace http://t.co/3dlwOzU2eq
Feel bad for the people of #NorthKorea when I see with my own eyes they live without electricity. #YearInSpace http://t.co/E28PWvEajV
#EarthArt In 377 cumulative days in space, I've never seen this before today. #YearInSpace http://t.co/j4O0RpchD9
Day 180. Moonlight over Italy. #BuonaNotte Good night from @space_station! #YearInSpace http://t.co/du1uNThgDk
#GoodMorning to the Holy City of #Mecca #Makkah! #YearInSpace http://t.co/pEeRKPla0G
Day 179. The #Nile at night is a beautiful sight for these sore eyes. Good night from @space_station! #YearInSpace http://t.co/eAMBZ9p428
#EarthArt Half a year, still she dazzles, colors, intrigues, excites, amuses, interests and shines. #YearInSpace http://t.co/m8eijSS8pq
Day 190. Clouds bathe #Europe in a cool glow. #Goodnight from @Space_Station! #YearInSpace http://t.co/g9ZYOyTb27
Day 166. #Venus photobombed the #Moon tonight. Good night from @space_station! #YearInSpace http://t.co/9lRdYn1rbE
Day 165. On the number of stars in our #MilkyWay galaxy, mind blown. Good night from @space_station! #YearInSpace http://t.co/piphlpemRE
My colleague @Astro_Kimiya took this photo of the eye of this Eastern Pacific typhoon. Impressive! #YearInSpace. http://t.co/uU5tZnap7R
Another pass through #Aurora. The sun is very active today, apparently. #YearInSpace http://t.co/1uDtRzrGuY
Tomorrow we'll eat the anticipated veggie harvest on @space_station! But first, lettuce take a #selfie. #YearInSpace http://t.co/fUKQMhEDjK
Day 127. Sunset returns! Perfect end. Thanks again for joining me today. Good night from @space_station! #YearInSpace http://t.co/qFGNapGIl3
#GoodMorning #Barcelona, #Spain! Looking beautiful as usual from @Space_Station. #YearInSpace http://t.co/P448JdLr78
#Goodevening #Japan. Showing @Astro_Kimiya how to take pictures of #Earth at night. #YearInSpace http://t.co/0UpTnVtdVK
#Bahamas, the strokes of your watercolors are always a refreshing sight. #YearInSpace. http://t.co/ISASTDak90
#Athens, #Greece, #GoodMorning from @Space_Station. Wishing you the best. #YearInSpace http://t.co/zAMEz5JvlW
Good morning from 250 miles above the African desert. #YearInSpace http://t.co/wE0KrGDfdN
Stars and stripes from @Space_Station. Happy #NationalFlagDay! #YearInSpace http://t.co/0jlup7w6Ij
I don't know where in the US Southwest this is, but it sure is beautiful. #YearInSpace http://t.co/lmaUEOS8Eg
Subtropical Storm #Ana churns off the East coast of USA. #Wx from @Space_Station. #YearInSpace http://t.co/uaMRGDO8JG
Had my first cup of fancy coffee yesterday from the much anticipated @Space_Station #espresso machine. Not too bad. http://t.co/tpnHyTczul
Parts of #Canada look like a cracked window this #Sunday as the ice melts. #YearInSpace http://t.co/rUmrtPs6s2
#SaturdayMorning #coffee with my old friend #PlanetEarth. #YearInSpace http://t.co/zmKmVBCuLk
Sometimes #Earth looks like another planet from @Space_Station. #YearInSpace http://t.co/NKQC6egnBP
Good morning from #ISS. This high altitude Central Asian lake looks like my morning cereal. #BreakfastOfChampions http://t.co/htJZP1CoGF
Sometimes the #world seems to shimmer. #YearInSpace http://t.co/ttGibGTW2Z
#Himalayas. What icy veins you have. #YearInSpace http://t.co/C94vLDu3jy
@AstroTerry and I celebrating #OpeningDay and the #Astros and #Orioles being tied for 1st place! #MLB. #YearInSpace http://t.co/DAzBFUEkQ7
Good morning #Texas from the #ISS. Looks like #Houston and #Austin have some #weather headed your way. #YearInSpace http://t.co/boDVsCY9vX
.@FLOTUS Thank you. Made it! Moving into crew quarters on @space_station to begin my #yearinspace. http://t.co/jhoj7ltaV6
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Kelly and Lindgren kept a close lookout for any ammonia flakes that might escape and contaminate their suits.

Their Oct. 28 spacewalk featured a robot-arm lube job and other mundane maintenance.

Kelly has been at the 250-mile-high outpost since March, and isn't due back until next March. Friday marked his 224th day in orbit, already a U.S. record. His companion for the long haul is Russian Mikhail Kornienko.

Four other astronauts are on board for the typical six months: Lindgren along with a Japanese and two other Russians.

This was the 190th spacewalk in the station's 17-year history. Astronauts have been on board, continuously, for 15 years.

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