Author Topic: US EVA-43 - Unplanned Spacewalk - May 23, 2017  (Read 41485 times)

Offline Chris Bergin

Station managers are go for Tuesday spacewalk with @AstroPeggy & @Astro2fish to change out failed data relay box.

Article by Pete Harding:
https://www.nasaspaceflight.com/2017/05/spacewalkers-unplanned-eva-replace-failed-ext-1-mdm/

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https://blogs.nasa.gov/spacestation/2017/05/21/station-managers-give-go-for-tuesday-spacewalk/

Expected to be only two hours in duration.
« Last Edit: 05/23/2017 11:23 am by Chris Bergin »
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Offline DanWerts

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Re: US EVA-43 - Unplanned Spacewalk - May 23, 2017
« Reply #1 on: 05/22/2017 04:19 am »
I'm going to be very interested in the analysis of where in the MDM the failure occurred. Multiplexers are my bread and butter.
Thanks for posting!
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Offline Mark McCombs

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Re: US EVA-43 - Unplanned Spacewalk - May 23, 2017
« Reply #2 on: 05/22/2017 04:50 pm »

Expected to be only two hours in duration.


This will place Peggy at #3 on the all time cumulative spacewalk hours list.

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Offline Chris Bergin

Re: US EVA-43 - Unplanned Spacewalk - May 23, 2017
« Reply #3 on: 05/22/2017 06:42 pm »
May 22, 2017

MEDIA ADVISORY M17-060

NASA TV Coverage Set for May 23 Space Station Contingency Spacewalk

NASA astronauts Peggy Whitson and Jack Fischer are preparing for an unscheduled spacewalk outside the International Space Station Tuesday, May 23. Live coverage will begin at 6:30 a.m. EDT on NASA Television and the agency’s website.

Whitson, Expedition 51 commander, and Fischer, flight engineer, will replace a critical computer relay box that failed May 20. The relay box, known as a multiplexer-demultiplexer (MDM), is one of two units that regulate the operation of radiators, solar arrays and cooling loops. They also route commands to other vital station systems.

Because each MDM is capable of performing the critical station functions, the crew on the station is in no danger and station operations are not affected.

The failed relay box was installed in the space station truss March 30 during a spacewalk by Whitson and Expedition 50 commander Shane Kimbrough. Whitson prepared a spare data relay box May 21, and tested components installed in the replacement. She reported the spare MDM is ready to be brought outside to replace the failed unit.

The spacewalk to replace the failed box is planned to last about 2.5 hours. While Whitson is replacing the MDM, Fischer will install a pair of antennas on the U.S. Destiny Laboratory module to enhance wireless communication capability for future spacewalks.

The spacewalk will be the 201st in support of space station assembly and maintenance, the sixth spacewalk conducted from the Quest airlock this year, the 10th for Whitson and the second for Fischer.

Whitson, who already is the leading female spacewalker in history, will be designated extravehicular crew member 1 (EV-1) wearing a suit with red stripes. Fischer will be designated as EV-2, wearing a suit with no stripes.

Get NASA TV streaming video, schedule and downlink information at:

https://www.nasa.gov/nasatv

Learn the latest on the International Space Station, its crew and their research at:

https://www.nasa.gov/station
« Last Edit: 05/23/2017 08:13 am by jacqmans »
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Offline jcm

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Re: US EVA-43 - Unplanned Spacewalk - May 23, 2017
« Reply #4 on: 05/22/2017 11:23 pm »
What do we know about the replacement box? How long has it been up there?

The failed box is the one installed on the Mar 30 spacewalk. I don't know its serial number.
It replaced the previously failed box  MDM-16E-0103  which is now inside.
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Offline russianhalo117

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Re: US EVA-43 - Unplanned Spacewalk - May 23, 2017
« Reply #5 on: 05/23/2017 12:55 am »
What do we know about the replacement box? How long has it been up there?

The failed box is the one installed on the Mar 30 spacewalk. I don't know its serial number.
It replaced the previously failed box  MDM-16E-0103  which is now inside.
They were having RPCM trips and failures in this location prior to MDM failure. causes of some of the RPCM are still being reviewed

Offline centaurinasa

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Re: US EVA-43 - Unplanned Spacewalk - May 23, 2017
« Reply #6 on: 05/23/2017 08:31 am »
US EVA #43  (201th ISS assembly and maintenance and 6th this year, 10th for Whitson and the 2nd for Fischer.) planned tasks:
- S0 ITS EXT-1 MDM  R&R (Witson EV-1)
- Destiny Lab nadir  EWC "External Wireless Communications" antennas Instal  (Fischer EV-2)
« Last Edit: 05/23/2017 08:48 am by centaurinasa »
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Offline centaurinasa

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Re: US EVA-43 - Unplanned Spacewalk - May 23, 2017
« Reply #7 on: 05/23/2017 08:33 am »
Concerning the Cubesat deployment:
"The second #QB50 airlock cycle has been delayed due to contingency EVA that will occur this week on ISS. We will keep you posted! #CubeSat"

https://twitter.com/QB50Mission
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Offline centaurinasa

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Re: US EVA-43 - Unplanned Spacewalk - May 23, 2017
« Reply #8 on: 05/23/2017 08:35 am »
MDM box measures 10.5- by 14.9- by 16.4 inches (27- by 38- by 42 centimeters) and weighs 51 lbs. (23 kilograms.)
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Offline centaurinasa

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Re: US EVA-43 - Unplanned Spacewalk - May 23, 2017
« Reply #9 on: 05/23/2017 08:39 am »
Current Live view....
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Offline centaurinasa

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Re: US EVA-43 - Unplanned Spacewalk - May 23, 2017
« Reply #10 on: 05/23/2017 08:46 am »
MCC-H: "Ready for EMUs purge" !
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Offline centaurinasa

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Re: US EVA-43 - Unplanned Spacewalk - May 23, 2017
« Reply #11 on: 05/23/2017 09:04 am »
"Purge complete" !
To boldly go where no human has gone before !

Offline centaurinasa

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Re: US EVA-43 - Unplanned Spacewalk - May 23, 2017
« Reply #12 on: 05/23/2017 09:07 am »
To boldly go where no human has gone before !

Offline centaurinasa

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Re: US EVA-43 - Unplanned Spacewalk - May 23, 2017
« Reply #13 on: 05/23/2017 09:10 am »
2Fish PGT...
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Re: US EVA-43 - Unplanned Spacewalk - May 23, 2017
« Reply #14 on: 05/23/2017 09:14 am »
What stream do you follow?

Nothing shows yet on NASA TV (replays).

Offline centaurinasa

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Re: US EVA-43 - Unplanned Spacewalk - May 23, 2017
« Reply #15 on: 05/23/2017 09:17 am »
PGT "Pistol Grip Tool"
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Offline centaurinasa

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Offline centaurinasa

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Re: US EVA-43 - Unplanned Spacewalk - May 23, 2017
« Reply #17 on: 05/23/2017 09:23 am »
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Offline centaurinasa

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Re: US EVA-43 - Unplanned Spacewalk - May 23, 2017
« Reply #18 on: 05/23/2017 09:27 am »
Time for light exercise.....
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Offline centaurinasa

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Re: US EVA-43 - Unplanned Spacewalk - May 23, 2017
« Reply #19 on: 05/23/2017 09:30 am »
« Last Edit: 05/23/2017 09:31 am by centaurinasa »
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