Watch live: Spacewalk underway outside International Space Station

STORY WRITTEN FOR CBS NEWS & USED WITH PERMISSION

Two newly arrived space station astronauts, both veteran spacewalkers, suited up and ventured outside the lab complex Thursday to install additional wireless communications gear, to replace a balky camera and its pan-and-tilt mechanism and to remove two suspect hoses in the station’s ammonia coolant system.

Floating in the Quest airlock module, Drew Feustel and Ricky Arnold switched their suits to battery power at 9:33 a.m. EDT (GMT-5), officially kicking off a planned 6.5-hour excursion.

For identification, Feustel, call sign EV-1, is wearing a suit with red stripes and using helmet camera No. 17 while Arnold, EV-2, is wearing an unmarked suit and is using helmetcam 18.

The astronauts got off to a late start, delayed about an hour and 20 minutes because of troubleshooting required after Feustel’s suit failed three leak checks. His helmet, gloves and carbon dioxide absorbent canister were removed, the sealing surfaces wiped down and the gear was reinstalled. The suit passed the fourth leak test and the crew pressed ahead without incident.

The required troubleshooting reminded onlookers that working in a vacuum with 500-degree temperature swings while moving through space at more than 17,000 mph will never be routine, despite 208 earlier injury-free station excursions.

“It’s probably the most dangerous thing we do in terms of on-orbit operations,” Kenny Todd, space station operations and integration manager, told reporters earlier this week. “Yes, we’ve done a lot of EVAs, yes, we’ve had a lot of success with EVAs. But that comes with a lot of hard work and a lot of preparation and attention to detail. I don’t want us to ever, ever forget the lessons we’ve learned along the way.”

The first item on the agenda Thursday was for Arnold, his feet anchored to the end of the station’s robot arm, to install wireless antennas, attached to handrails, on the front of the lab complex to permit external payloads to relay data to the ground and for use by approaching commercial crew ferry ships being built by Boeing and SpaceX.

“If you’ve ever done any home networking, you know that while your living room might get good wi-fi signal maybe your front porch, the signal drops off,” said Flight Director Anthony Bareha.

“Well, the International Space Station has a front porch, it’s called the JEM Exposed Facility, we do science on it. We want to make sure we’ve got good wi-fi coverage out on that facility so some of those upcoming payloads that require that wi-fi to get their science to the ground have that resource available to them.”

While Arnold worked on the antenna installation, Feustel planned to focus on removing two flexible jumper hoses in the station’s ammonia cooling system that are believed to be the source of a small leak. The hoses were isolated earlier, clearing the way for their removal. They will be replaced during a future outing.

“Back last year, we were chasing a bit of an ammonia leak on the port side,” said Todd. “It looks like there’s a set of flex hose jumpers that we have it narrowed down to. Based on the reconfigurations that were done back last year and seeing that the leak stopped, we feel pretty comfortable in saying the issue is with these jumpers.”

With the hoses removed, Feustel will join Arnold for work to replace a balky standard-definition camera and its pan-and-tilt mechanism. A high-def camera will be removed and reinstalled on the new pan-and-tilt unit.

If time is available, the astronauts may carry out a few lower-priority get-ahead tasks before returning to the Quest airlock and calling it a day.

Thursday’s spacewalk was the 209th EVA since station assembly began in 1998, the fourth so far this year, the seventh for Feustel and the third for Arnold. Going into the excursion, more than 120 astronauts and cosmonauts had logged 54.2 days of spacewalk time outside the station.

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