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30 April 2003

HUBBLE SPACE TELESCOPE

DAILY REPORT        # 3352

PERIOD COVERED: DOY 119 (partial day observations due to safemode
event-see SIGNIFICANT EVENTS section)

Part 3 of 3

FLIGHT OPERATIONS SUMMARY:

Significant Spacecraft Anomalies: (The following are preliminary
reports of potential non-nominal performance that will be
investigated.) 

HSTAR 9008:  Gyro 3 Motor Current (GRG2_3MC) spiked for several
             samples {at} 119/12:18:09Z, reaching a maximum value of
             294 mA {at} 119/12:18:33Z.
             Current was running around 193 mA before the spike,
             settle to 201 mA after the spike.

HSTAR 9010:  Zero Gyro Safemode entry {at} 119/14:21:39Z.  See HSTAR 
             9008.  Gyro 3 Motor
             Current spiked {at} 119/12:18:33Z, three additional
             current spikes were observed beginning at 119/14:03:22Z,
             leading to a large increase in Gyro 3 Motor Current
             beginning ~ 119/14:19Z.  FGS 1 suffered LOL {at} 119/14:16:
             42Z and recovered FL {at} 119/14:18:33Z.  After normal
             LOS {at} 119/14:20:15Z for TDRSS
             ZOE, when telemetry recovered {at} 119/14:35:26Z,
             Observatory was in ZGSP.
             System Momentum Test failed {at} 119/14:21:39Z, Two Gyro
             Test failed {at} 119/14:24:37Z.

COMPLETED OPS REQs:
16939-0  Contingency GYRO#3 Restart#2 {at}119/1537z
16755-2  Contingency GYRO#1 Power On in ZG Safemode {at}119/1543z
16942-0  Dump ESB Messages {at}119/1715z
16943-0  Power On GEA/TAGS after ZGSP Entry {at}119/1718z
16945-1  Transition NICMOS to SAAOPER {at}119/1817z
16946-0  GYRO 1246 Reconfiguration {at}119/1949z
16947-0  Recovery from ZGSP {at}119/1954z/Completed {at}120/0609z
16948-0  Transition WFPC-2 from DECON to Standby {at}119/2100z
16949-0  ZGSP Recovery Steps 24 Load name {at}119/2128z
16950-1  R/T Map {at}119/2233z
16951-1  R/T Map {at}119/2240z
16952-1  R/T Map {at}120/0002z
16954-0  LBBIAS Uplink {at}120/0111z
16953-0  R/T Map {at}120/0132z
16955-0  ARU/PRT {at}120/0204z
16956-1  Update PSEA RGA Configuration {at}120/0250z
16957-0  R/T Map {at}120/0508z
16958-0  N02Z9950A Uplink, Set pointer & Clear Safeinit Flags {at}
          120/0321z
16959-0  LBBIAS Uplink {at}120/0620z
16960-0  ARU/PRT {at}120/0721z

OPS NOTES EXECUTED:
0911-0  Limit Management during WFPCII Decontamination
 {at}119/2115z(M001) 1095-5  Consolidated PCS Limit
 Modifications{at}120/0401z

                 SCHEDULED     SUCCESSFUL    FAILURE TIMES
FGS GSacq            2             2
FGS REacq            2             2
FHST Update          1             1
LOSS of LOCK

SIGNIFICANT EVENTS:

Zero gyro Safemode entry 119:14:21:39z due to gyro 3 current spikes.
The Health and Safety load is scheduled to start at 120/02:00, with
the Science Mission Specification (science intercept load) starting
at 121/00:00. 

More detailed safemode descriptions:
Gyro 3 Motor Current (GRG2_3MC) spiked for several samples {at}
119/12:18:09Z, reaching a maximum value of 294 mA {at} 119/12:18:33Z.
Motor Current was running around 193 mA before the spike, settled
down around 201 mA after the spike.  See HSTAR 9008.  Gyro 3 Motor
Current spiked an addition three times beginning {at} 119/14:19Z.
Normal LOS for TDRSS ZOE occurred {at} 119/14:20:15Z.   After exit ZOE
and telemetry was recovered, data showed Observatory in ZGSP.  System
Momentum Test failed {at} 119/14:21:39Z, Two Gyro Test failed {at} 119/14:
24:37Z. 

Commencing at 14:52 GMT, operations personnel made three unsuccessful 
attempts to restart gyro #3. Commands were sent to start Gyro #1 at
15:42 GMT. Gyro #1 turned on successfully.  Motor Current stable
120 mA.

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