Aug_07_1999_H.txt Shift H17 (A17)
        Start at 1999:220:02:00:00 GMT
                = 1999 Aug 7 10:00pm EDT
        End       1999 Aug 8 6:00am EDT

See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or 
/proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Aug_05_1999_H.txt.
   
SOT Lead	Ed Kellogg
SOT SC/ACA	Tom Aldcroft
FOT-SI		Eric Martin
HRC-SI		Ralph Kraft
ACIS-SI		Fred Baganoff, Mark Bautz

(Times will be given in GMT on day 220. not precise.)

EVENTS							PLAN	DONE	OBSID
--------------						----	----	-----
Start shift (10pm EDT 07 Aug 1999)			0200	0200	62712
Continue monitoring ACA fidlites, all at 6th mag		ongo
ACIS internal calib						ongo
CAP 180 ISIM thermal stability test				ongo
Finish CAP 180						0400
Go for IPS deactivation					0550	0238
Paged Dan Michaels						0315
New obsid							0448	62711
Start IPS deactivation,					0500
Re-acquired all four fidlites					0530
Vented He tank							0635
Finish IPS deactivation						0650
Post-IPS cleanup						0736	
Finish ACIS internal calib, command Rad Belt Entry	0806	0830
New obsid for radiation						0845	62477
CAP 070, disable radmon						0917
Maneuvers: yaw, then pitch to 135 for ACA full search	0900	0933
Begin ACA full field search				1000	0945

End shift (6am EDT 08 Aug)		day 220		1000

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

At M-to-H shift change, 218:0020, Chandra was 7 hrs ahead of
readiation zone, 11.5 hrs ahead of perigee. ACA was monitoring one
fidlite in the correct window, with high stray light background. HRC
was on, low voltage power only, EPHIN was nominal, and ACIS was doing
an internal calibration.

220:0238 A decision was made to do no more burns, proceed with IPS
deactivation. Also a decision was made not to dump fuel because there is no
problem with slosh. IPS deactivation was successfully completed at 0700.


The fidlite stability patch for the PEA's, designed to cure the problem of
ACA loss of fidlites, has not yet reached TRW. SOT should check twice
per 8-hr shift at both BALL and TRW for progress of patch development
(BALL contact: Dan Michaels - pager 1-888-788-0344).

We disabled radmon at 0917. From now on, we should not have to do
this, because of our higher perigee. 

 
The ACA full field search is begun and working nominally.