Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/ops/swat/safing/14084/decision_to_recover.txt Дата изменения: Thu Mar 27 15:01:13 2014 Дата индексирования: Mon Apr 11 15:40:20 2016 Кодировка: Поисковые слова: ultraviolet

Date: Wed, 26 Mar 2014 17:51:53 -0400
From: John Bacinski
Subject: FW: Flash Report: COS Suspend Project Briefing: HSTAR 14001


The COS tiger team presented its findings to the Project this afternoon. The
cause of the COS suspend event was an Intel exception (Array Bounds Check) on
the Detector Interface Board (DIB), that resulted in an invalid command
acknowledge error. The COS Control Section reacted by slow suspending the
instrument. The DIB is the board that processes events coming out of the
detector and records them to the buffer memory. The Tiger Team recommended a
nominal recover (which power cycles the DIB and is expected to clear the
problem).



The initial plan was to recover the instrument in the morning, but further
review of the DVA back plate temperature indicated more time was required to
warm the FUV prior to observing, so we have decided to do the recovery this
evening.



I will send out a message after COS has been recovered.



-jb



John Bacinski

Space Telescope Science Institute

Instrument Engineer







From: Van Arsdall, Morgan
Sent: Wednesday, March 26, 2014 5:45 PM
Subject: SCI: Flash Report: COS Suspend Project Briefing: HSTAR 14001



A project briefing was held on Wednesday March 26 to address the COS suspend
event from 084/21:46. COS suspended when the Control Section flight software
detected a problem sending the ?get DIB telemetry? command to the Detector
Interface Board. The slow suspend sequence was successfully called and COS is
now in a nominal suspend state. Additional information is available in the
project briefing package.

1. Updates to Presentation:



Pg. 18 ? the HAR number was corrected (HAR 2395)

No other changes were made to the presentation. The presentation is posted to
the Anomaly Briefings web page on the Systems Management SharePoint site:
http://edocs.hst.nasa.gov/hstsysman/Briefings/AnomalyBriefs.aspx.

2. Action Items:



Action 1 ? Prepare and review Ops Request to perform nominal suspend recovery
for COS

Action 2 ? Review Ops Request at 6pm this evening

Action 3 ? Investigate the thermal status of COS with respect to the FUV STIM
temperatures



3. Waiver Approvals:



None.



4. Discussion/Agreements:



The team agreed to the forward plan recommended by the initial Tiger Team
meeting:



? Recover COS to its nominal intercept state

o NUV in HVSAA and FUV in HVLow

? The next COS science observation begins at ~086/21:13

? Exact timing of the COS recovery will be discussed at the 6pm
meeting. In an effort to preserve the science observations tomorrow afternoon,
a recovery this evening is being targeted

Additional investigation information is available on the COS suspend website:
http://edocs.hst.nasa.gov/hstsysman/COSsuspend2014/default.aspx

5. Liens:



None.









~~~~~~~~~~~~~~~~~~~

Morgan M. Van Arsdall

Lockheed Martin IS&GS

Hubble Space Telescope

Systems Management