ACE Weekly 04/20/2007 - 04/26/2007

All ACE spacecraft subsystems are performing nominally.

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Orbit/Attitude:

No maneuvers were completed this week.  The next attitude maneuver is
scheduled for Thursday, 05/10/2007.

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OCRs:

None

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Activities:

RIONET - Permission has been given to continue the String 2 conversion to
the Restricted IONet.  The HP OS will be addressed in a different forum.  A
new transition schedule will be developed in the next week.

Space Link Extension (SLE) - ACE SLE version 2.1 was delivered to the
Library on April 28, 2006.  Installation in the ACE MOC will not occur until
after the MOC is converted to the RIONET.

An evaluation is ongoing to replace the TPOCC mission software and
incorporate ACE operations into a multi-mission ops center.  A decision
between L3 INCNG and ITOS mission software is expected by the end of April.

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Anomalies:

DOY 111  04/21/2007  S-ACE-0171  G07-0030  TPOCC/OS Bitbucket Error
The HPUX operating system occasionally returns a bitbucket error when the
TPOCC software executes a unix program.  The ROBOTT automation software is
designed to continue through the error.  Usually, this is not a problem, but
on DOY 111 the procedure continued before the SSR redumps had been
calculated.
IMPACT:  SSR redumps not performed during DOY 111 pass.  However, SSR
redumps were performed at the beginning of the next pass and all data was
available on CDR.

DOY 116  04/26/2007  S-ACE-0172  G07-0031  Workstation Unplugged
A UPS/PDU circuit identification was being performed in the MOC.
Workstation 1 on the String 2 was unintentionally unplugged.  System
administrator restored workstation later in day.
IMPACT:  Minimal.  String 2 was not the designated backup in expectation of
the RIONet transition.

DOY 116  04/26/2007  S-ACE-0173  G07-0032  DSS-66 Antenna Stop
At 1334z (44 minutes into pass) DSS-66 antenna stopped due to y-axis brake.
Station was unable to release the brakes.  DSS-65 was available and provided
downlink from 1449-1600z.  DSS-65, however, does not have S-Band uplink so
no commanding was available.  DSS-63 (70m) was available from 1700-1800z,
but was not used since DSS-63 had never been used or tested with ACE.  The
next support has been increased by 20 minutes.  SSR playback will be
up-to-date in 2 days (Saturday DOY 118).
IMPACT:  85 minute redump to be performed next support.  No data to NOAA
from 1334-1449z and 1600-1620z.