Sep_02_1999_L42.txt Shift L42 
        Start at 1999:245:10:00 GMT = 1999 Sep 02 06:00am EDT
        End                           1999 Sep 02 02:00pm EDT

   
SOT Lead	Ed Kellogg
SOT SC/ACA	Tom Aldcroft
FOT-SI		
HRC-SI		
ACIS-SI CAP 375 to open shutters				1728
SOC does CAPs, PRs 78-9 patch OBC for OTG & ACA			

NOTES/ISSUES/PROBLEMS 
--------------------- 
At start of shift, we were LOS.

Upon AOS, ACA had two fidlites (2nd window fidlite was missing) and 5
stars. By 1212, we were maneuvering, so we had no stars, 2 fids. Upon
target acquisition, we again got 5 stars, still only 2 fids.  John
Chappell found that after the shutter focus runs were complete, the
OFLS did not automatically set the shutter positions to the default
location; we are now doing observations with the shutters
partially blocking the HRC. John arranged a CAP to retract the
shutters at 245:1715 (comm specially scheduled two hours early for
this).

We acquired a GRETA laptop at SOT Manager station to replace the one
that was taken away yesterday. Bruce Twambly will come shortly to set
it up and restore the display pages.

The following is an edited excerpt from Howard Cohn's flt S/W patch
database at http://ipa.harvard.edu/ddts/ddts_main as of ~10:00
am. Instructions for making a query are in the SOT Manager Operational
Notes log at the TST room SOT Manager station. The column labeled St
is Status, and Sv is Severity. The categories for Status are New,
Open, Resolved.


            S       S
Identifier  t Patch v  Headline
----------  - ----- - -------------------------------------
OCCcm02758  O PR-77 3 Change K-consts ACA_Thresh_Max_Lim,ACA_Thresh_Min_Lim
OCCcm02770  O PR-78 3 OTG motor drive voltage scale factor
OCCcm02738  R PR-69 3 Adjust SA temperatures
OCCcm02737  R PR-70 3 PCAD on-orbit value adjustments for SCS 36
OCCcm02739  R PR-71 3 Change ET offset
OCCcm02741  R PR-72 3 ACA reset time before NMM to NPM transition
OCCcm02740  R PR-73 3 ACA search window reset from SCS 193 to SCS 120
OCCcm02749  R PR-74 3 Spacecraft Momentum Monitor Threshold Increase
OCCcm02742  R PR-75 3 OTG potentiometer limit changes
OCCcm02765  R PR-76 3 Change OFP TLM Requests re. OTG Data

PRs 77 & 78 have been approved for implementation by the FD board.

The report from the previous shift, "HRC status 2IMCLST, imaging
detector HVPS current limit enable, was giving an exception advisory."
was investigated by Mike Juda. He found that these events were all
normal operations whenever the HVPS state is changed. For example,
during a ramp-up it occurs six times.

At about 1730 we found out that SOC had an approved CAP to
insert and retract the HETG under software control, and were planning
to execute it during the current comm pass. We told them not to, since
it would interfere with the current HRC operation. At this morning's
standup meeting, we heard that it would be executed tomorrow at 2
PM. Somehow the approval process should be modified to have SOT sign
CAPs so we could have picked up this kind of problem. Ron Felice was
informed of this procedural problem.