Aug_10_1999_L19.txt Shift L19 (A19)
        Start at 1999:222:10:00:00 GMT
                = 1999 Aug 10 06:00am EDT
        End       1999 Aug 10 2:00pm EDT

See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or 
/proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Aug_10_1999_L19.txt.
   
SOT Lead	Ed Kellogg
SOT SC/ACA	Bill Podgorski
FOT-SI		
HRC-SI		John Chappell
ACIS-SI		Paul Plucinsky

(Times will be given in GMT on day 222. not precise.)

EVENTS							PLAN	DONE	OBSID
--------------						----	----	-----
Start shift (06am EDT 10 Aug 1999)			1000	1000	62707
Continue monitoring 4 ACA fidlites, 6.6-6.8 magn	ongo
ACIS Bkgnd Orbit Characterization			ongo
Begin new ACIS Bkgnd Orbit Characterization			1201	62706
Lost track of one fidlite					1340
Started CAP 129	to reacquire, set lites over mag range		1355
Reacquired  4 lites						1402
ACIS stops Bkgnd Orbit Characterization			1800		62706
ACIS starts CAP 224 BKG_UNFILTERED			1800		62705
ACIS resumes Bkgnd Orbit Characterization		2000		62704  
End shift (2pm EDT 10 Aug)		day 222		1800



NOTES/ISSUES/PROBLEMS 
--------------------- 

At H-to-L shift change, 222:1000, Chandra was 13 hrs past apogee, 13
hrs to perigee. ACA was monitoring four fidlites in the correct
window; high background flag was set because of stray light. HRC was
on, low voltage power only, EPHIN was nominal, and ACIS was continuing
its Background Orbit Characterization. 

As of 1220, spacecraft configuration: IU-A, CTRU-A, RCTUs A Side,
OBC-A Online, OBC-B Offline; both OBCs flt SW 4.8 on-orbit image;
VDE-A operations again, SPE-B configured for IRU-B & FSSA-B
operations, autonomous unloading enabled again, momentum monitor fault
safing action (SCS #9) remains disabled, commanded attitude monitor
and safing action (SCS #28) remains disabled, pointing is NSM (normal sun
mode), 90 deg solar array angle, vacuum 7.6e-6 torr, link via
Canberra-DSN direct-512-LGA-B.


The fidlite stability patch for the PEA's, designed to cure the
problem of ACA loss of fidlites, is still being tested on the hardware
test bed at Ball, even though the patch has been delivered to OCC. A
decision was made by Fred Wojtalik that the patch shall not be
uploaded until all testing is complete, and Ball and TRW have
indicated complete satisfaction that it is ready. This means that we
won't upload the patch until after the sunshade door is open. That
will require us to plan a time for testing this patch. It may mean we
wait until a time after first light that doesn't conflict with other
phase 2 activities, and happens a few hours before we enter the
radiation zone.