Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.stsci.edu/ops/swat/safing/09170/wfc3_recovered_to_operate.txt Дата изменения: Thu Jun 25 01:19:24 2009 Дата индексирования: Sun Mar 2 08:18:40 2014 Кодировка:

Date: Sat, 20 Jun 2009 06:24:33 -0400
From: Thomas Wheeler
Subject: [Fwd: Flash - WFC3 recovered to Operate]



[ Part 2: "Included Message" ]

Date: Sat, 20 Jun 2009 01:24:09 -0400
From: "Richardson, Holly "
Subject: Flash - WFC3 recovered to Operate


[ Part 2.2: "Attached Text" ]


WFC3 Recovery to Operate in preparation for SMS intercept completed
successfully at 171/04:49 GMT.



The first attempt to recover to Operate per OR 18540-1 began at
170/21:15 GMT but was unsuccessful. At 170/23:49z GMT, during the
transition from Boot to CS Operate, WFC3 safed on a temperature limit
violation. It was determined that ordering of steps in the recovery
was incorrect, and more conservative target temperatures were needed
at the waits. OR 18540-1 was closed with a status of Execution
Failed. HSTAR 11890 was written to document the safing. A new Ops
Req was submitted to implement a second recovery attempt.



The second commanded recovery of WFC3 was conducted per OR 18545-0.
Commanding commenced at 171/01:06 UTC, putting the instrument in Boot
and enabling detector power relays to facilitate warming. The
transition from Boot to Operate was started at 171/04:38. This time
there were no OOLs or other issues, and all three Operate levels --
CS, Mechanism, Detector -- were achieved.



As expected, the Operate configuration monitor shows four miscompares
due to TECs being off. A few temperatures continue to exceed CCS
ground lower limits, but these should come back in bounds during the
next 24 hours as the instrument warms.



Holly Richardson