The avionics box will carry data connections and electricity to science experiments at the station. Whitson, who is wearing a suit with red stripes, holds the record for most spacewalks by a female American astronaut. Whitson is also the first woman to command the ISS, a feat achieved in 2008, and holds the record for most time an American has spent in space. Live coverage of the milestone event will begin in the stream above at around 6.30AM ET, with the spacewalk itself scheduled to start 8AM and continue for six-and-a-half hours.
Friday's mission was Whitson's ninth spacewalk.
Whitson and Fischer shared a second good cable, known as an umbilical, as they prepared to leave the station's airlock, which burned through some of their spacesuits' battery power.
American astronauts Peggy Whitson and Jack Fischer's spacewalk was delayed slightly this morning due to a water leak in one of the suits.
The spacewalk is the 200th in support of station assembly and maintenance since construction began in 1998 on the $100-billion laboratory that flies about 250 miles (400 km) above Earth.
Rookie space station flier Jack Fischer and commander Peggy Whitson kicked off a shortened spacewalk Friday to install a replacement avionics unit on an external storage platform. Find us on Facebook too!
Fischer was also able to install a protective shield and a foot restraint on PMA-3, an attachment that will help commercial craft dock with the station via a future International Docking Adaptor.
The 1 spacewalk in support of construction, maintenance or fix of the space station happened in 1998, when the NASA still used space shuttles and the space station itself was like a tiny, New York City apartment compared to the expansive space mansion that it is today. Officials suggested eventually transitioning the ISS from NASA to the private space industry.
The Friday spacewalk marks Fischer's first walk in space, and he is. enthusiastic.
The rescheduled start time of the spacewalk was unclear, as French astronaut Thomas Pesquet took extra steps to stow the equipment and prepare for the use of just one SCU, following the orders of mission control in Houston. That prompted the USA space agency to shorten the outing and assign the astronauts just one task.
With landing September 3, Whitson's total time in space over three missions will stand at 666 days, moving her up to eighth in the world, just behind Yurchikhin at No. 7 with 673 days in orbit and six other cosmonauts. "It's humbling to be a part of their legacy".