US spacewalk number 79 will begin at the Quest airlock.
US astronaut Kayla Barron, EV-1 denoted by the Red Stripes,
will egress first and receive a very large IROSA mod kit strut bag.
US astronaut Raja Chari in the plain white suit will egress second
with a crew lock bag.
After quick buddy checks EV-1 will head up to face one
and out to the S4 Integrated Equipment Assembly, pausing momentarily
to drop her fairlead green hook just inboard of the Solar
Alpha Rotary joint and then continue her translation out to the S4 three
Alpha Integrated Equipment Assembly, where she will still the large IROSA Mod
kit strut bag in prep for the building of the upper triangle of the mod kit.
Meanwhile, EV-2 will follow EV-1 up to face one.
EV-2 will stop at the starboard cetacart where he will tempt stow crew lock
bag of tools and retrieve a foot restraint and a worksite interface extender
known as a WIF-EX and then translate outboard
pausing momentarily to drop his fairlead green hook just inboard of the solar
alpha rotary joint.
Continuing outboard EV-2 will cross over to the radiator
side of the IEA and stow the foot restraint and the worksite
interface extender into the worksite interface nummber 26.
EV-2 will then set up the foot restraint and for optimum
IROSA mod kit upper triangle installation
and then translate over to join EV-1 to begin assembling the upper triangle.
EV-1 and EV-2 will work together to build the upper triangle.
The crew will build the triangular segment loosely
and they will tighten up the structure by driving the bolts to tork.
EV-2 will then translate over to an ingress the foot restraint.
EV-1 will reposition for the handoff.
EV-1 will hand off the upper triangle to EV-2.
EV-2 will lay back and work to soft dock the segment
onto the Beta Gimbal Assembly and then drive four bolts.
EV-1 will temp stow her PGT with a short socket on a local handrail
while EV-2 will egress the foot restraint and bias it to the left hand side.
EV-1 will go over to the bag and retrieve the left mid strut
and work to pass this off to EV-2
for a body restraint tether stow.
EV-2 will then reingress the foot restraint while EV-1 retrieves
the long eight foot lower strut from the bag and hands it to EV-2.
While EV-2 holds the long lower strut EV-1
will reposition to the solar array, blanket box or
SOB for the install of the left lower strut.
As a team the crew will move the strut into position
and EV-1 will begin it driving this bolt by hand four turns.
EV-2 will
then work to align and drive his bolt on the mounting bracket side two turns
and then EV-1 will work to complete the torque on this bolt
by driving with the pistol grip tool to a high torque and then following
with an even higher torque on the torque wrench.
Once the bolt is deemed good, EV-2 will be given a go
to drive his bolt to torque using the pistol grip tool.
And this completes our minimum config.
EV-1 will reposition to the beta gimbal assembly
and EV-2 will hand off the telescopeing mid strut for install.
EV-1 will work too soft dock the side pad onto the BGA
while EV-2 holds his side and place, EV-1 will start her four bolt two turns
with the pistol grip tool and then EV-2 will drive his clevers
bolt to talk on the mounting bracket.
EV-1 will then complete her four bolts with her pistol grip tool
and then EV-2 will drive his bolt to torque.
EV-2 will then egress and reposition
the foot restraint to bias it to the right hand side.
The crew will then repeat the hand-off sequence.
First then mid strut for body restraint tether stow, foot
restraint ingress followed by hand off of the very long lower right strut.
EV-1 will then reposition to the right hand side of the three alpha
beta gimbal assembly and an analogous install strategy will unfold.
EV-1 will position at the right SOB bering for lower
strut install and drive the lower strut bolt to torque.
EV-1 will drive his clevis bolts to the mounting bracket.
EV-1 will then reposition at the VGA and they will hand off the right
telescoping mid-strength following the same install strategy.
Once complete EV-1
will translate onto the mid strut and drive two color bolts to talk
to lock out the telescoping mechanism and rigidise the right hand side.
EV-2 will then egress the foot restraint and begin to clean up.
Once the multilayer insulation or MLI is fully closed and wire tied down,
EV-1 will reposition to repeat the color bolt and MLI ops on the left hand side.
EV-2 will then translate around the integrated equipment assembly
and stow the tools back in the bag.
He'll then fold in up to third for ready for translationlater in the EVA.
EV-2 will then translate
back around the IEA to the foot restraint and work to stow the foot restraint
in the worksite interface extender on his body restraint tether.
EV-1 meanwhile will translate over to the non radiator
side of the IEA to take some still imagery of the completed mod kit.
EV-1 will then translate out to S6 for a battery charge discharge unit.
She will begin installing some wire
ties on a handrail in prep for restraining the MLI
or multi-layer insulation that covers the battery charge discharge unit.
Meanwhile, EV-2 will translate out to the starboard CETA-CART
to stow the foot restraint and worksite interface extender.
Low profile on the starboard CETA-CART.
EV-2 will then retrieve the crew lock bag onto his body restraint tether
and head back out to S6 to join EV-1.
Both crew will work together to open the multilayer insulation
covering the battery charge discharge units.
This will allow for robotic access when needed in the future.
They'll perform some on orbit origami for it
the shape of a triangle and restrain it out with the wire tie to a local handrail.
The crew will then work to break torque first on H-1 followed by H-2
and then restrain the other MLI back to open
and expose the second battery charge discharge unit
and then work to break torque and reinstalled to a known
lower torque on the second battery charge discharge unit.
Both crew then will clean up and retrieve
the crew lock bag to the BRT or body restraint tether
and begin to head inboard for the completion of the EVA.
EV-2 will lead the way in since he led with second outboard
translate across the IEA, retrieve his fairlead green hook,
translate under the MT and at the CETA
handrail bridge translate Nader down to our airlock. EV-1
meanwhile will
translate to the S4 IEA, retrieve the folded up
mod kit bag, grab her fairlead green hook, translate past the CETA-CARTS
hitting those brake pedals down the CETA handrail bridge and to the airlock,
concluding a very successful US spacewalk number 79.