Author Topic: ORU list - updated  (Read 7902 times)

Offline Space Pete

ORU list - updated
« on: 05/03/2013 02:41 PM »
Since the most recent ORU list is now very outdated, I thought I'd make my own, which I have attached below. I have cross-checked it across multiple sources.

Comments welcome!

-----

Edit - see latest version.
« Last Edit: 07/06/2013 01:38 PM by Space Pete »
Electronic Engineer by day, NASASpaceflight's ISS Editor by night | Read my NASASpaceflight articles here

Offline brahmanknight

  • I don't have all the right answers, but I do have all the right questions
  • Full Member
  • ****
  • Posts: 686
  • Liked: 7
  • Likes Given: 94
Re: ORU list - updated
« Reply #1 on: 05/03/2013 08:48 PM »
Good stuff, Pete.   I always appreciate updated lists for the station.

Offline robertross

  • Canadian Member
  • Senior Member
  • *****
  • Posts: 17775
  • Westphal, Nova Scotia
  • Liked: 442
  • Likes Given: 3378
Re: ORU list - updated
« Reply #2 on: 05/04/2013 12:57 PM »
Thanks Pete!
Always like to stay current with spares on board, now more than ever due to life expectancy limitations
Remembering those who made the ultimate sacrifice for our rights & freedoms, and for those injured, visible or otherwise, in that fight.

Online mtakala24

Re: ORU list - updated
« Reply #3 on: 05/10/2013 12:17 AM »
You've done good research on the amount and locations of ORU's on the ISS. Is it possible to do such research for the ORU's that are on the ground, i. e. what NASA has ordered, or stored, or scheduled for launch?

Offline axmor61

  • Member
  • Posts: 37
  • Port Saint Lucie, Fl
  • Liked: 2
  • Likes Given: 7
Re: ORU list - updated
« Reply #4 on: 07/02/2013 04:51 AM »
 Space Pete,
I noticed that the RRM is missing from ELC-4.
Think it's time to update!

Offline Space Pete

Re: ORU list - updated
« Reply #5 on: 07/02/2013 08:39 AM »
Space Pete,
I noticed that the RRM is missing from ELC-4.
Think it's time to update!

No, RRM is a payload, not an ORU. ;)
Electronic Engineer by day, NASASpaceflight's ISS Editor by night | Read my NASASpaceflight articles here

Offline axmor61

  • Member
  • Posts: 37
  • Port Saint Lucie, Fl
  • Liked: 2
  • Likes Given: 7
Re: ORU list - updated
« Reply #6 on: 07/02/2013 02:31 PM »
Yeah, I noticed it too late.
I just got carried away thinking it was a complete list of ORU's and payloads on all the external pallets.
Anyway, thanks for putting all this together. Great research.

Offline jcm

  • Senior Member
  • *****
  • Posts: 2814
  • Jonathan McDowell
  • Somerville, Massachusetts, USA
    • Jonathan's Space Report
  • Liked: 357
  • Likes Given: 299
Re: ORU list - updated
« Reply #7 on: 12/24/2013 02:42 AM »
Nice!   
Minor nit: you have only half updated it I think. My understanding was that as of today,
what is on ESP-3 is indeed  the PM whose "ORU number" is #2, but it is not the thing removed on EVA-24,
which is PM # 1 launched in 2006, but the new spare PM which was launched in 2009.  As of tomorrow, if all goes well, ESP-3 will carry PM #1 for which the
rest of your data is correct.
Or do the ORU numbers get reassigned when something is swapped out?

My main  issue  - in addition to 'ORU numbers'  PM #1, PM #2, etc. there are serial numbers - so PM#1 is S/N 004,
and that is the number that is actually stamped on its side.  The difference is that the original
PM launched integrated with S1 had a serial number (it was PM S/N 002 in fact, not to be confused with PM #2), but didn't have an ORU #.

It would be great to try and collect the serial numbers for the ORUs as well as the ORU numbers.
Because you don't have enough to do :-)

In particular, I'd love to know the S/N of PM #2 (the spare on ESP-3 that will be installed in S1 on EVA-25)
 - Jonathan
-----------------------------

Jonathan McDowell
http://planet4589.org

Offline Space Pete

Re: ORU list - updated
« Reply #8 on: 12/24/2013 08:12 AM »
Hi Jonathan,

You're opening up a whole can of worms with that post! ;)

I probably should have made this clear, but the ORU numbering used in my table is not representative of their actual numerical designation - I took the original numbering from an old NASA graphic showing external ORUs, however it is very difficult keeping the numbering aligned with their actual designations - since I do not even know how the designations actually work.

For instance, regarding the PMs, one could argue that on EVA-24, ORU #1 (the first PM ORU launched to the ISS) was removed, and today it will be replaced with ORU #2. Unless of course the two original PMs launched inside the P1 and S1 Trusses counted as ORUs #1 and #2? Or maybe the ORU numbers follow the same pattern as the S/Ns - so for instance PM S/N 003 would be ORU #3?

Does the ORU numbering stay fixed (i.e. ORU #2 is still designated as such even when it is in service), or would the ORU that ORU #2 has replaced then take on the designation of ORU #2?

Ideally I would, as you say, like to designate them via their S/Ns, which in the case of the PMs is fairly simple to keep track of, as there are only two units in use on the ISS (which presumably were originally S/Ns 001 and 002), and only four spares have ever been launched, all since RTF.

However, in the case of the PFCS that was removed in May (of which there are eight units in use on ISS), how would I know the S/N of the PFCS that was removed (presumably it would be S/N 001 or 002, but I don't know which since both were launched together)? Nor do I know the S/N of the PFCS that replaced it (and would the PFCSs on the Trusses be S/Ns 0 through 8, or would the S/Ns follow the order in which the PFCSs were launched, bearing in mind some spares were launched prior to Truss segments carrying the "active" units, and some spares were launched along with the active units attached to the Truss segments)?

It's all so complicated!

In short, the only way to have accurate ORU numbering is to have a list of all ORU serial numbers, and a historical record of what S/Ns were launched, installed, and returned, and in what order. Since I don't have that, I have elected to simply use the original NASA designations I had for ORU numbers - which isn't now correct, but it's no worse that having some ORUs (such as the PMs) following their presumed designation, and others using another, non S/N-based numbering system for lack of data.
« Last Edit: 12/24/2013 08:40 AM by Space Pete »
Electronic Engineer by day, NASASpaceflight's ISS Editor by night | Read my NASASpaceflight articles here

Offline jcm

  • Senior Member
  • *****
  • Posts: 2814
  • Jonathan McDowell
  • Somerville, Massachusetts, USA
    • Jonathan's Space Report
  • Liked: 357
  • Likes Given: 299
Re: ORU list - updated
« Reply #9 on: 12/24/2013 10:34 AM »
Sure. I'm just suggesting adding an extra column to put the S/Ns in as we learn them...
-----------------------------

Jonathan McDowell
http://planet4589.org

Offline srtreadgold

  • Engineer
  • Member
  • Posts: 37
  • Houston
  • Liked: 30
  • Likes Given: 95
Re: ORU list - updated
« Reply #10 on: 07/03/2014 02:28 PM »
This list is extremely useful, thanks a lot.

Offline Space Pete

Re: ORU list - updated
« Reply #11 on: 05/29/2015 09:46 PM »
Finally got around to updating this for the ESP-2/ELC-2 PM swap-over back in March.
« Last Edit: 05/29/2015 09:47 PM by Space Pete »
Electronic Engineer by day, NASASpaceflight's ISS Editor by night | Read my NASASpaceflight articles here

Online Olaf

  • Full Member
  • ****
  • Posts: 1033
  • Germany
  • Liked: 169
  • Likes Given: 172
Re: ORU list - updated
« Reply #12 on: 11/15/2017 05:39 PM »
https://blogs.nasa.gov/stationreport/2017/11/
Quote
Spare Latching End Effector (LEE)/Utility Transfer Assembly (UTA) Flight Releasable Attachment Mechanism (FRAM) Swap:  Today, Robotics Ground Controllers maneuvered the Space Station Remote Manipulator System (SSRMS) and picked up the Special Purpose Dexterous Manipulator (SPDM) in preparation for tomorrow’s LEE/FRAM swap activities.  Tomorrow, they will remove the UTA from External Stowage Platform (ESP)-2 and translate the Mobile Transporter (MT) from Work Site (WS)-4 to WS-7. They then remove the LEE and install the UTA on ELC-1. The MT will then be translated back to WS-7 from WS-4 and the LEE will be installed on ESP-2. These activities are in preparation for EVAs planned next January.

Tags: