From: Marc Postman (mpostman@comcast.net)
Date: Thu Jun 22 2006 - 15:16:23 PDT
Here is the latest info on ACS...
Begin forwarded message:
> Since the last update, a number of theories regarding the cause for
> the suspension of ACS have been ruled out or at least rendered
> highly unlikely. The leading theory for the suspension appears to
> be a failure of the +15 Volt power converter, which supplies both
> the HRC and WFC CCD Electronics Boxes (CEBs). However, a failure
> within the CEBs has not been completely ruled out as of this time.
> Further tests with ACS and with ground equipment are being
> performed now and are scheduled to continue for the next days.
>
> Preparatory work for a potential switch to the redundant
> electronics of ACS (ACS Side 2) has started. A detailed timeline
> and recovery procedure for this switch was developed and initially
> tested last year. Assuming that the cause of the failure can be
> identified with reasonable certainty by the middle of next week,
> the nominal schedule foresees a Flight Readiness Review next
> Thursday, 29 June, with the switch to Side 2 being part of the SMS
> starting on 2 July. Should the tests yield tangible results
> earlier, this schedule may even be advanced somewhat.
>
> Since this morning, an SMS without any ACS commanding is executing.
> Likewise, the SMS for next week does not contain any ACS observing,
> but has been filled to the extent possible with science
> observations using the remaining instruments.
>
> We will provide further updates as information becomes available.
>
> Helmut
This archive was generated by hypermail 2.1.4 : Thu Jun 22 2006 - 15:16:21 PDT