Author Topic: MISSION FAILURE: Progress M-27M launch Soyuz-2-1A - April 28, 2015  (Read 335376 times)

Offline Prober

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Hope someone is grabbing that spin video .....wow
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Offline AJA

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I don't know if it's my stream or if people've swamped NASA TV... but I managed to catch Rob saying that MCC-M have disabled dynamic attitude adjustment and are currently not attempting to stop the spin.


Anyone else catch that?

Offline lucspace

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Judging by the time code, it looks like a 15 rpm spin...

Offline jcm

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I don't know if it's my stream or if people've swamped NASA TV... but I managed to catch Rob saying that MCC-M have disabled dynamic attitude adjustment and are currently not attempting to stop the spin.


Anyone else catch that?

Yes, I think they are probably worried about depleting thruster propellant?
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Online DaveS

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I don't know if it's my stream or if people've swamped NASA TV... but I managed to catch Rob saying that MCC-M have disabled dynamic attitude adjustment and are currently not attempting to stop the spin.


Anyone else catch that?
Yes. I think the thinking behind that is that this might be a failure in the Motion Control System (MCS) and it is confusing the Progress as to its true attitude. This could explain the multiple Rate Sensor failure messages obtained during the last telemetry downlink.
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Offline Artyom.

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Online DaveS

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Hope someone is grabbing that spin video .....wow
Here you go:

"For Sardines, space is no problem!"
-1996 Astronaut class slogan

"We're rolling in the wrong direction but for the right reasons"
-USA engineer about the rollback of Discovery prior to the STS-114 Return To Flight mission

Offline robertross

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2 min away from next ground station pass
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Offline AJA

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Yes, I think they are probably worried about depleting thruster propellant?

Yes. I think the thinking behind that is that this might be a failure in the Motion Control System (MCS) and it is confusing the Progress as to its true attitude. This could explain the multiple Rate Sensor failure messages obtained during the last telemetry downlink.

(Emphasis mine)

Both make sense.

Also, @DaveS: They broke down TLM data? Where?

Offline robertross

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ISS heading for a pass just north of London.

Get out and wave Chris!  :)
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Offline AJA

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Currently attempting a telecommand uplink (don't know with what instructions).

Anyway, how many issues are we dealing with?

1. Off nominal orbit
2. Spacecraft in a spin
3. Sporadic telemetry (probably due to 2, but also because KURS didn't deploy?)
4. Re-pressurisation of manifolds failed.

It's apparently over London right now. CHRIS! DO SOMETHING :D
« Last Edit: 04/28/2015 01:19 PM by AJA »

Offline Targeteer

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From the ground track display, Moscow only has one more, very short, ground station opportunity after this one to work with today.
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Online DaveS

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Yes, I think they are probably worried about depleting thruster propellant?

Yes. I think the thinking behind that is that this might be a failure in the Motion Control System (MCS) and it is confusing the Progress as to its true attitude. This could explain the multiple Rate Sensor failure messages obtained during the last telemetry downlink.

(Emphasis mine)

Both make sense.

Also, @DaveS: They broke down TLM data? Where?
That was reported on NASA TV earlier that they had obtained telemetry and subsequent analysis showed multiple Rate Sensor error messages.
"For Sardines, space is no problem!"
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"We're rolling in the wrong direction but for the right reasons"
-USA engineer about the rollback of Discovery prior to the STS-114 Return To Flight mission

Offline asmi

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Yes, I think they are probably worried about depleting thruster propellant?
I doubt that - all Progress engines can use all propellant that is onboard (including a portion that it's supposed to deliver to ISS for refueling), so it's very unlikely there is a danger of depleting it anytime soon (the engine has to fire for hour or so to burn through all propellant).
The reason is probably has to do with not making a problem worse as at such spin rate mechanical damage is possible.

Offline asmi

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1. Off nominal orbit
Orbit is nominal - TLEs provided were incorrect.

Offline Targeteer

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In an ironic note, the planned docking location hasn't been removed from the NASA ground track display.
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Well I didn't expect to come back to this news. Thanks for the coverage.

Any way out of Loss Of Vehicle here?

Online DaveS

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Something that concerns me is the battery state of health. With this spin the solar arrays can't provide a stable recharge to the batteries.
"For Sardines, space is no problem!"
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"We're rolling in the wrong direction but for the right reasons"
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Offline robertross

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Well I didn't expect to come back to this news. Thanks for the coverage.

Any way out of Loss Of Vehicle here?

Cross your fingers?
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Offline kevinof

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Doesn't look good. no telemetry received on last pass.

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