Author Topic: Expedition 24 thread (June 2 - September 24, 2010) - Includes ETCS Updates  (Read 182200 times)

Offline JimO

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Here's my rough translation of a Novosti story that just moved on the Russian-language wire:

The component is discovered which could prevent the separation of "Soyuz " from the ISS

07:55 24/029/2010 //  http://www.rian.ru/science/20100924/278720642.html

MISSION CONTROL CENTER, 24 Sept - RIA Novosti. The flight engineer of the ISS Fedor Yurchikhin, who is located on board the station near the closed entrance port of the ship “Soyuz TMA-18”, discovered under the jacket of the actuator of an attachment point a broken-off gear wheel - possibly, precisely, this component prevented the regular separation of the spacecraft.

The separation of the manned spacecraft “Soyuz TMA-18” with three cosmonauts aboard, planned on 05.39 Moscow Time on Friday, was postponed through technical reasons. The ship could not be unjointed from the mooring port of module “Pirs”. In Mission Control they hope that the separation can be carried out soon; however, they do not exclude the delay of this operation.

On the request of Mission Control specialists, flight engineer Yurchikhin removed the jacket of the actuator of an attachment point - and revealed there the broken off gear wheel with size approximately 2 centimeters, about which he reported to Mission Control.

For the cosmonaut it was possible to photograph the gear wheel with two broken teeth and during a communications tele-session he showed the photograph to specialists.

It was obvious that of seven teeth on the gear wheel, two are broken in the photograph. It is possible that this faulty part was one of the reasons which impeded the opening of the undocking locks of the spacecraft “Soyuz TMA-18” from the ISS module “Pirs”.

Mission Control specialists thus far give no official comments.

Earlier story had this graf vice the final three, above:
"This object, similar to an asterisk with a hole in the middle, flew away further under the cover I do not see it, and therefore thus far I cannot reach it. Possibly, this is a gear wheel in size not more than two centimeters" , said Yurchikhin.

Offline Fuji

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A few minutes ago, NASA TV was showing a replay of some downlink of a piece of a "gear mechanism" with "two broken teeth."

Did you manage to capture some screenshots? Missed it as I was more focused on the comms.
No, I was hoping someone here might have...but I'm sure we'll see it again if it's related to the problem.

Sounds like they're going to work on opening up the hatches.

CBS News post the dameged gear picture.
http://www.cbsnews.com/network/news/space/home/spacenews/files/23edc67089539098be03ef34d7c11073-72.html
« Last Edit: 09/24/2010 05:14 AM by Fuji »

Offline FinalFrontier

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A few minutes ago, NASA TV was showing a replay of some downlink of a piece of a "gear mechanism" with "two broken teeth."

Did you manage to capture some screenshots? Missed it as I was more focused on the comms.
No, I was hoping someone here might have...but I'm sure we'll see it again if it's related to the problem.

Sounds like they're going to work on opening up the hatches.

CBS News post the dameged gear picture.
http://www.cbsnews.com/network/news/space/home/spacenews/files/23edc67089539098be03ef34d7c11073-72.html
So how does one fix something like this? I am guessing they cannot re open the hatches and reenter ISS with things the way they are now.
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Online DaveS

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A few minutes ago, NASA TV was showing a replay of some downlink of a piece of a "gear mechanism" with "two broken teeth."

Did you manage to capture some screenshots? Missed it as I was more focused on the comms.
No, I was hoping someone here might have...but I'm sure we'll see it again if it's related to the problem.

Sounds like they're going to work on opening up the hatches.

CBS News post the dameged gear picture.
http://www.cbsnews.com/network/news/space/home/spacenews/files/23edc67089539098be03ef34d7c11073-72.html
So how does one fix something like this? I am guessing they cannot re open the hatches and reenter ISS with things the way they are now.
They can and have. The problem isn't closing the MRM-2 hooks and latches, it is opening them for undocking.
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Offline John44

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Offline marshallsplace

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The damaged gear from NASA TV this morning:
« Last Edit: 09/24/2010 08:18 AM by marshallsplace »

Offline robertross

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Thanks to all for this coverage. Very much appreciated.

I'd say a gear re-design is in order  ;)
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Offline ChrisC

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The ruler in that photo should be indicating centimeters, right?
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Offline Hungry4info3

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The ruler in that photo should be indicating centimeters, right?

Yes.

Offline JimO

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Is NASA mistranslating 'jumpers' here?

Stage Set for Undocking Friday
http://www.nasa.gov/mission_pages/station/main/index.html
   The stage is set for Soyuz TMA-18 to undock from the International Space Station at 10:02 p.m. EDT Friday after overnight repairs successfully fixed a troublesome docking mechanism.
   Space station crew members installed a series of jumpers, bypassing a failed component that had prevented commands from being received by the Russian Poisk module's docking mechanism. Once the jumpers were in place, the Poisk module hooks and latches were successfully opened. A similar series of hooks and latches on the Soyuz side of the docking mechanism remains in place, firmly holding the spacecraft to the space station.
   The station crew will sleep until 2 p.m. before it begins preparations for tonight's undocking and an early Saturday landing of Expedition 24 crew members Alexander Skvortsov, Tracy Caldwell Dyson and Mikhail Kornienko.
   At 12:12 a.m., the Mission Control Centers in Houston and Moscow concurred on a plan to reopen the Soyuz hatches and allow Alexander Skvortsov, Tracy Caldwell Dyson and Mikhail Kornienko to reenter the station. The planned undocking was prevented when commands being sent to disengage the hooks and latches holding the Soyuz TMA-18 spacecraft failed. The spacecraft remains securely docked to the Poisk module.
   Engineers are continuing to troubleshoot the problem. Expedition 25 Commander Doug Wheelock and Flight Engineers Shannon Walker and Fyodor Yurchikhin sent down video and still photos of a small star-shaped gear with two broken teeth, and experts are evaluating whether the part is related to the commanding problem.

Online PahTo

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Where did the gear come from/what does it actuate?  I imagine it wasn't just a stray piece left behind during fabrication/assembly of MRM-2...

Space Pete noted the manual crank used to seal the hatch cover, but I don't think the cover mechanism means the diocking mechanism itself.  Perhaps this (gear) is part of the hatch cover mechanism?  Is the cover critical to maintaining an airtight seal with no vehicle docked?

I know, I ask a lot of questions, but such is the life of a troubleshooting engineer turned manager.

Offline psloss

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Here's Bill Harwood's update:
http://www.cbsnews.com/network/news/space/home/spacenews/files/23edc67089539098be03ef34d7c11073-72.html

Quote
09:45 a.m. EDT, 09/24 Update: Installation of electrical bypass jumpers appears to resolve docking system anomaly

Installation of electrical jumpers that mimic an expected-but-absent "hatch locked" signal in the docking mechanism of the space station's Poisk module appears to have resolved a glitch that prevented three crew members from undocking and landing early Friday, officials said.
« Last Edit: 09/24/2010 02:17 PM by psloss »

Offline JimO

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Russian press reports describe an undocking glitch the last time a vehicle left the Poisk. But date references and the claim it was Soyuz TMA-17 conflict with my own records. Can anybody identify the vehicle and date for the previous Poisk undocking, and whether any 'glitch' was disclosed at that time? Spasibo!!


Offline Space Pete

Thanks to all for this coverage. Very much appreciated.

I'd say a gear re-design is in order  ;)

Well, this system has been in use on the FGB & SM for 10 years without issue. However, given that MRM-2 is a new module, I wonder if the gear was redesigned?

For the teeth to have snapped off like that, I'd say the gear would have to have been put under a lot of mechanical force.

The earliest that a replacement part could be flown up is aboard Soyuz TMA-01M on Oct. 8.
However, with MRM-1 now permanently berthed to FGB Nadir, it may be possible to remove the obviously working gear from FGB Nadir & install it in MRM-2.

Russian press reports describe an undocking glitch the last time a vehicle left the Poisk. But date references and the claim it was Soyuz TMA-17 conflict with my own records. Can anybody identify the vehicle and date for the previous Poisk undocking, and whether any 'glitch' was disclosed at that time? Spasibo!!

That would have been Soyuz TMA-16 on March 18, 2010.
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Offline JimO

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That would have been Soyuz TMA-16 on March 18, 2010.

Right! But the only undocking anomaly reported by NASA appears unrelated to hardware:

ISS On-Orbit Status 03/18/10
   Yest posadka! (We have Landing!) Welcome back home, Jeff and Max! After 169 days 4 hrs 9 min in space (167d docked to ISS), Soyuz TMA-16/20S, carrying Exp-22 crewmembers Maxim Suraev (Russia) and Jeff Williams (USA), landed successfully this morning at 7:24am EDT (local time 5:24pm) in the snow-bound steppes of southern Kazakhstan northeast of the town of Arkalyk, with the crew in excellent condition. The descent capsule toppled on its side. See photo below. [TMA-16 (#226) undocked from its MRM2 port this morning at 4:03am EDT. Before undock, the crew performed leaks checks of the vestibule area between the MRM2 and the Soyuz spacecraft, of their suits and of the hatch between the Descent Module (SA) and Orbital Module (BO). There were 3 Longeron Shadowing cautions for the ISS during the preparation for undock, but these were quickly cleared because the vehicle was in planned (verified) configuration & attitudes. The Undock command was issued at 4:00am, followed by separation at 4:03am.

Is the Russian claim a garble or was there more that was unreported?

Offline JimO

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New entry in Shannon Walker's space blog:

September 24, 2010 // Posted by Eric Berger at 11:28 AM

Being a human test subject in space: On the perils of blood pressure monitors and urine collection in zero gravity

 http://blogs.chron.com/inorbit/

Offline mtakala24

has anyone seen the timeline for the second attempt?

Offline aquarius

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has anyone seen the timeline for the second attempt?

Hatch closure- 6:45 pm EDT
Undocking- 10:02 pm EDT
Deorbit burn- 12:32 am EDT
Landing- 1:21 am EDT.

Offline Space Pete

From ISS On-Orbit Status Report for 24/09/2010:

Crew Sleep Cycle Shift:
To accommodate tonight's second attempt at Soyuz TMA-18/22S undocking, crew workday began at 6:00 PM GMT, after a long sleep (from 6:30 AM GMT) and ends with sleep at 5:35 AM GMT tomorrow morning. After a "sleepy" Saturday, wakeup on Sunday (26/09): 6:00 AM GMT, returning to normal.

Soyuz TMA-18/22S Undock Slip:
Last night, during the 22S undock attempt, the MRM-2 hooks failed to open, causing deferral of the departure to tonight after a number of troubleshooting attempts. New times are: Undocking – 1:59 PM GMT; Landing – 5:31 AM GMT. Descent timeline will change commensurably (see yesterday's status report).
• Background: Because of an issue with a TVU/Terminal Computing
  Device in MRM-2, hook opening for undocking was to be commanded
  manually by FE-1 Alexander Skvortsov in lieu of via computer
  (and PPL (Pre Positioned Load)). During MRM-2 hatch closure by the
  crew, the signal for "hatch closure" was received, but the indication of
  "hatch locked" (i.e. sealed) was not. FE-5 Fyodor Yurchikhin reopened
  & reclosed the hatch and moved the ratchet to the emergency
  position. Vestibule depressurization thereafter did not yield the same
  vacuum measurements from the pressure sensors in Soyuz and in
  MRM-2. After analysis, TsUP-Moscow gave the Go for the Soyuz crew
  to drive the hooks. But because the "hatch locked" indication was
  absent, hook opening did not happen. While waiting for a second
  attempt, Fyodor discovered a 7-toothed sprocket with 2 teeth missing
  floating behind the hatch inside the docking mechanism. It turns out
  that the dislodgment of the sprocket, with its rod sheared, prevented
  the "hatch locked" sensor from passing on its status – which in turn
  kept the hooks from opening.
• As a "workaround", by wiring 6 electrical jumpers appropriately with a
  pin-out board to mask the absence of the signal, the signal was
  emulated (faked), thus mimicking the "sealed" condition. As a result:
  the hooks opened, rendering the 22S spacecraft ready for departure
  tonight. All that's needed is to remove the QD clamps (manually) and
  release the Soyuz side hooks.
• The jumper configuration will be left in place until the next Soyuz
  docking – which will deliver a new jumper, to be installed instead. A
  NASA/Moscow ISS Management Meeting reviewed the situation this
  morning in detail, and there are no objections to tonight's undocking or
  the 08/10 launch date of Soyuz TMA-01M/24S.
• Message from Flight Control to the crew this morning: "Great training
  run yesterday! We also owe a huge thanks to Fyodor and the team for
  working late to get those MRM-2 hooks open! "This was another "First"
  for the ISS Program."

After wake-up at ~6:00 PM GMT, Alexander began going through the standard pre-undocking steps:
• Working with Fyodor & FE-3 Mikhail Kornienko on moving the Russian
  payloads back to Soyuz for stowage which had to be transferred
  overnight to the RS for preservation in the refrigerated containers
  (i.e., BTKh-6/ARIL, BTKh-7/OChB, BTKh-10/KONYUGATSIYA,
  BTKh-27/ASTROVAKTSINA & BIO-1/POLIGENE).
• Activating the Soyuz at ~9:10 PM to 10:10 PM GMT.
• Downlinking the standard report on the finished loading operations
  (~10:10 PM GMT).
• Removing the ZVB quick-release screw clamps on the SSVP docking
  mechanism between the MRM-2 & 22S which had to be put back in last
  night to rigidize the connection.

Wheels also will close the external protective window shutters of the Lab, JPM and Cupola in preparation for the undocking.

Mikhail & FE-2 Tracy Caldwell-Dyson are to join Alexander in the Descent Module, while Alexander performs the regular communications check from 22S.

Hatches will be closed by Alexander (in Soyuz) and Fyodor (in MRM-2) at ~10:30 PM to 10:50 PM GMT. The hatch closing will be covered live by photo/video as a PAO event, with FE-6 Shannon Walker in charge of video camera activation and deactivation after the event.

The departing Soyuz crew then starts the standard one-hour leak checks on the Soyuz to MRM-2 vestibule and their Sokol suits.

Later, Fyodor activates & verifies proper operation of the Russian TEKh-15/DAKON-M IZGIB ("Bend") experiment in the SM (Service Module) for taking structural dynamics data during the Soyuz spacecraft undocking. [IZGIB has the objective to help update mathematical models of the ISS gravitation environment, using accelerometers of the Russian SBI Onboard Measurement System, the GIVUS high-accuracy angular rate vector gyrometer of the SUDN Motion Control & Navigation System and other accelerometers for unattended measurement of micro-accelerations at science hardware accommodation locations - (1) in operation of onboard equipment having rotating parts (gyrodynes, fans), (2) when establishing and keeping various ISS attitude modes, and (3) when performing crew egresses into space and physical exercises.]

Structural dynamics measurements of the undocking will also be taken with the US IWIS (Internal Wireless Instrumentation System).

After the undocking, Fyodor will:
• Manually close the MRM2 KVD/PEV (Pressure Equalization Valve).
• Reconfigure the Russian STTS onboard comm system to its "undocked"
  mode, and later, after the Soyuz landing in Kazakhstan, reset it to
  nominal mode.
• Conduct the regular daily check of the aerosol filters at the Russian
  Elektron O2 generator, installed by Maxim Suraev on 19/10/09 in gaps
  between the BZh Liquid Unit and the oxygen outlet pipe (filter FA-K)
  plus hydrogen outlet pipe (filter FA-V) [the filters will be inspected
  again later today].
• Downlink the TEKh-15/DAKON-M IZGIB measurement data and the
  photo/video footage of the hatch closure event to the ground.
• Support the ground-commanded reactivation of the Elektron O2
  generator by monitoring the external temperature of its secondary
  purification unit (BD) for the first 10 minutes of operations to ensure
  that there was no overheating.

After attitude control authority has been handed over to the RS MCS (Motion Control System) at ~1:00 AM GMT, the ISS will go into Free Drift at 1:58 PM to 2:07 PM GMT for MRM-2 hooks opening and Soyuz undocking at ~2:02 PM GMT. Attitude control will return to US CMG Momentum Management at ~3:00 AM GMT.

After 22S departure, CDR Doug Wheelock will remove the 4 protective alignment guides on the T2 COLBERT treadmill.
« Last Edit: 09/24/2010 09:43 PM by Space Pete »
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Offline otisbow

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Help!  Is there any  one watching NASA TV off AC-3 Satellite.  They changed there Audio format to AC-3.  I have a Pansat 3500SD and have a great picture but NO SOUND! Dose anybody know how I can get the sound back using this recevied?
« Last Edit: 09/25/2010 12:52 AM by otisbow »

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