LIVE: STS-120 Flight Day 4 - EVA-1 + Node 2 Installation

[Chris Bergin]

On to Flight Day 4 and EVA-1 plus Node 2 Installation.

http://www.nasaspaceflight.com/content/?cid=5265 - a living article, so will be updated throughout.


Please note that we don't want to over duplicate images, so that task belongs to Zachstar when he's on site. That way we ensure an "easy on the eye" catch up for those arriving on the site midway through the flight day.

L2 Members, use the CLOUD, Hit STS-120, then EVA for the menu of about 200mb of presentations associated with this mission's EVAs.

From the Flight Plan and Flight Plan Walkthrough (and just a snippet, which gives you an idea of complexity):

FD4 – EVA 1 and Node 2 Installation:

• EVA 1 Overview: SASA retrieve from Z1 and install in PLB; Node 2 prep for unberth
(release and tether PDGF to Node 2, remove PCBM covers, disconnect LTA cables); Z1/P6
fluid line disconnect; P6 aft radiator shroud remove; SSU shroud install

• Assignments:
o MS1: EV1; MS3: EV2
o MS4: suit and task IV; ISS CDR: suit IV2
o MS2: M1 for SASA & M2 for Node 2; FE-2 (up): M2 for SASA & M1 for Node 2
o FE-2 (dn): M3

• EVA duration is 6:30. LiOH is used since a longer duration EVA might be necessary in the
event an EMU bake-out is required for a leak and suit contamination during the Z1/P6 wet
QD disconnect.

• EVA Prep/Campout protocol: ~35 minutes following campout crew wakeup and at least
8:40 since 10.2 depress was completed the night before, the airlock is repressurized to 14.7
psi and the hatch is opened. The EV crewmembers have 40 minutes while wearing their
quick-don masks for a hygiene break and to gather breakfast. The EVs and suit IVs (two)
ingress the airlock, close the hatch, and depress the airlock to 10.2 psi. The EVs then doff
the O2 masks, don the EMUs, and purge the EMUs with pure O2. The airlock is repressed
to 14.7 psi and the IVs exit. The EVs then perform a 60-minute in-suit prebreathe followed
by crew lock hatch closing and depress. Finally, the EVs perform Post Depressurization
where they disconnect from the Service and Cooling Umbilical (SCU), which marks the start
of the PET clock. The depress pump depresses the crew lock down 3 psi after which the
crew lock valves are opened to vacuum. Once depress is complete, the EVs egress the
crew lock and begin EVA setup.

• EVA 1 (EVA tasks and robotics):
? SASA Retrieve: SSRMS is maneuvered to an APFR install position and the EVs install
an APFR on SSRMS. Both EVs demate SASA connectors and bolts and EV2 hands
SASA off to EV1. EV2 ingresses the APFR on SSRMS and SSRMS is maneuvered to a
handoff position. EV1 hands SASA back to EV2, and SSRMS and EV2 are maneuvered
to the PLB.
? SASA Stow: Both EVs latch SASA in the PLB by attempting to hand tighten 6 bolts. If
they do not tighten easily, the crew may strap down SASA and continue with the Node 2
tasks, finishing SASA later. EV2 egresses the APFR and both remove it from SSRMS.
SSRMS is maneuvered to Node 2 pre-grapple position.
? Node 2 Prep for Unberth: While SSRMS/EV2 is maneuvering to the SASA PLB stow
position, EV1 begins to release the PDGF from its sidewall carrier. After SASA stow,
both EVs complete PDGF release and tether it to Node 2, and remove 8 PCBM covers.
IV deactivates Node 2 heaters with APCUs 1 & 2 off, and the EVs disconnect the Node 2
LTA heater cables. Node 2 is now ready for unberth and install with SSRMS.
? Z1/P6 Fluid QD Disconnect: EV1 disconnects 4 wet fluid QDs between Z1 and P6, and
replaces the shroud over the QDs. This is required prior to P6 detach on FD6.
? P6 Aft Radiator Shroud Deploy: EV2 sets up for the deploy, and EV1 deploys the
starboard shroud and EV2 the port. This is required prior to P6 radiator deploy on FD8.
10 FLT PLN/120/FIN
? SSU MLI Shroud Install: Both EVs install shrouds over the 2B and 4B SSUs. This is
required prior to P6 maneuver to handoff position on FD6 due to thermal concerns with
P6 in the handoff position for two days.
? EVA Cleanup/Ingress: The crew translates back to the airlock, performs tool inventory,
ingresses the airlock, and closes the hatch.

• Post EVA activities: After the EVs are back in the airlock, they perform Pre-Repress
connecting to SCUs, close the EVA hatch, and repress the crew lock to 14.7 psi. Post EVA
procedures include water recharge and METOX regeneration. BSA EVA tool battery
charging is initiated.

• Node 2 Install:
o SSRMS: SSRMS is located on the Lab PDGF which is required for Node 2 install. Once
the EVs complete Node 2 LTA cable disconnect and move clear of the Node 2 grapple
fixture, SSRMS grapples Node 2. And then when the EVs are fully clear of Node 2, CDR
releases the PRLAs and SSRMS unberths it and maneuvers to low hover. SSRMS then
maneuvers to port hover, intermediate position, preinstall, and ready-to-latch position.
SSRMS is limped after CBM 1st stage capture, and then brakes are applied after CBM
2nd stage capture and acquire bolts. Then SSRMS ungrapples Node 2 and maneuvers
to a clearance position overnight.
? CBM:
- Due to the high beta, the Node 1 port ACBM petal covers can only remain open for
2.8 hours with a 12-hour thermal hold limit. The Node 1 ACBM is inspected during
FN3 but then the petals must be closed again as soon as possible. On FD4, the petal
open is scheduled during a day pass prior to Node 2 grapple but this violates the
current thermal rule. Unless the constraint can be relaxed, Node 2 unberth may need
to be delayed ~15 minutes so the petals can be opened later in the sequence. The
petals must be opened prior to unberth so their status can be verified, and can not be
opened during SSRMS ops due to camera limitations.
- PLT performs CBM ‘verify premate’ sometime prior to SSRMS maneuver to ready-tolatch.
PLT and FE-2 (dn) perform 1st stage capture after SSRMS ready-to-latch, and
2nd stage capture and acquire bolts after SSRMS is limped. After bolts are acquired,
the ground performs CBM bolt loading for one hour.
? Node 1/2 Vestibule: PLT and FE-2 (dn) perform the Node 1/2 vestibule pressurization
and leak check after CBM bolt loading is complete. The final step in the procedure is to
open Node 1 port hatch. If the crew gets behind this day, it is technically possible to
reschedule this activity to FD5. But it is desirable to perform on FD4 to check the CBM
seal.
? SRMS/OBSS is in a position all day to view Node 2 install with the OBSS cameras.
? CBCS: The ISS crew powers up the Node 1 port CBCS camera prior to Node 2 install,
and removes it post install. It is necessary to minimize the duration which CBCS is
powered while in the Node 1 port hatch window at the current beta angles in order to
avoid exceeding certified limits. The CBCS is temp stowed in Node 1 for easy relocation
to Node 2 forward.

• Maneuvers: ISS does not perform an active maneuver to a new TEA for Node 2 install,
instead the CMGs are allowed to drift to a new attitude. The UNIV PTG update is performed
after SSRMS maneuvers to intermediate position. This is the point where DAP A15 is
required and so the maneuver update is tied to the DAP change for convenience.
• SSPTS is deactivated via ground command prior to the EVA to ensure the EVs do not get
close to hot connectors.

• EECOM / ECLS:
? N2 transfer from orbiter to ISS tanks is initiated by STS and ISS crew. Termination is
timelined on FD9.
• Transfer: One hour of generic transfer is scheduled for transfer of early items. This includes
IMV valves and O-rings required for Node 2 ingress on FD5.

[Ford Mustang]

FD4 TV Schedule:

[Ford Mustang]

EVA-1 Spacewalkers:

[Andy L]

Heck of a day coming up. Has anyone caught the wake up songs so far?

[rdale]

They didn't wake up yet - check the schedule above for the wakeup times.

[rdale]

ISS update tonight says that there will be a change to the pre-flight EVA plan - one of the spacewalkers will go past Harmony and check the status of the window cover that had opened up to determine if the Velcro is still in place. If that's all it is, then on EVA2 they will shut the window.

(Is it really that big of a deal that you don't just have him do it while he's there?)

[John44]

Video STS-120 - Overview EVA 1
http://www.space-multimedia.nl.eu.org/index.php?option=com_content&task=view&id=2957&Itemid=2

[Zachstar]

Good morning everyone! Looking forward to EVA coverage today?

Some images to get started!

[Zachstar]

7 mins to crew wake!

[Zachstar]

Crew Wake!

[Zachstar]

Guess who is Capcom!

Edit: Sorry it was a transition image so it got messed up!

[generic_handle_42]

Wake-up song was Rocketman by Elton John, played for Doug Wheelock.

Would've been funnier had they used the William Shatner version!

EDIT: FD4 Execute Package is up: http://www.nasa.gov/pdf/194491main_fd04exec.pdf

-Nick

[davcbow]

Looks like Shannan Lucid; hope thats spelled correct.... :cool:

[Zachstar]

Thanks for the package link!

From that package a view of the flap/snap.

[Zachstar]

Hatch open.

Time for them to grab breakfast and go .. you know  :bleh:

[davcbow]

Thanks to all for the video links...I think I'm going to like this forum....  

[Zachstar]

Note the start time

[michaelSN99]

good morning from germany

looking forward an interesting and very complex flight day...

i guess we in europa are in the fortunate situation to watch all this during daylight *ggg*

one reason more to thank you guys from the states for all this loads of information!!!

[Zachstar]

Spacewalkers preparing to don their spacesuits.

[Ankle-bone12]

davcbow - 26/10/2007  1:22 AM

Thanks to all for the video links...I think I'm going to like this forum....  

Yes you will. A combination of die hard space enthusiasts and professional NASA engineers.

You will soon become addicted as I have. :laugh: