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am1weekly_2000-218_2000-224

Mission Operations Days: 2000/218 to 2000/224
August 05, 2000 00:00:00 GMT to August 11, 2000 00:00:00 GMT


Terra Spacecraft and MODIS Instrument Status:

Terra (AM-1) is in Normal Ops Mode
MODIS is in Science Mode - A Side
MODIS has an anomaly with the Formatter. See description below.
ComponentState(s)Comment
BlackbodyA Off; B OffNominal
Calibration ElectronicsA On; B OffNominal
Control ProcessorA On; B OffNominal
Nadir DoorUnlatched, OpenNominal
Space View DoorUnlatched, OpenNominal
Solar Diffuser DoorUnlatched, ClosedNominal
FDDI FormatterA On; B OffNominal
FDDI PortA On; B OffNominal
FIFO Memory#1, #2, #3 & #4 OffFR Anomaly Investigation
Format ProcessorA On; B OffNominal
Power Supplies#1 On, #2 OffNominal
PV VIS FPAA On; B OffNominal
PV NIR FPAA On; B OffNominal
PV SMIR FPAA On; B OffNominal
PV LWIR FPAA On; B OffNominal
PC LWIR FPAA On; B OffNominal
RC Outgas HeatersAll Off (CS, IS, OS)Nominal
RC LWIR FPA HeaterOn (83 K)Nominal
RC SMIR FPA HeaterOffNominal
Scan AssemblyA On; B OffNominal
SDSMA Off; B OffNominal
SRCAA Off; B OffNominal
PS1 Survival HeaterEnabledNominal
PS2 Survival HeaterEnabledNominal
Timing GeneratorA On; B OffNominal
Flight SoftwareRev BDNominal
Inhibit Ids Set31 (Blackbody)
32 (Calibration Electronics)
FR Anomaly Investigation
TMONs Enabled66, 67Nominal

This Week’s Completed MODIS Activities:

Saturday, August 5, 2000

2000/218 00:00:00 ATC Blackbody to 270K
2000/218 00:00:30 ATC Blackbody duty cycle to 33%
2000/218 22:00:00 ATC Blackbody to 315K
2000/218 22:00:30 ATC Blackbody duty cycle to 100%
2000/218 22:06 – 23:00 Anomaly – Formatter resets

Sunday, August 6, 2000

2000/219 03:00 Real-Time – Transition to Standby Mode
2000/219 03:02 Real-Time – Transition to Low Power Mode (Macro 0)

Monday, August 7, 2000

2000/220 12:30 Real-Time – Disable Ground System Blackbody Alarms

Tuesday, August 8, 2000

2000/221 14:20 Real-Time – Timing Generator A On
2000/221 14:24 Real-Time – Scan Assembly A On
2000/221 14:28 Real-Time – Formatter A On
2000/221 14:34 Real-Time – Transition to Low Power Mode (Macro 0)
2000/221 15:18 Real-Time – Cold Stage Outgas Heater On
2000/221 15:58 Real-Time – Intermediate Stage Outgas Heater On
2000/221 16:00 Real-Time – SMIR Itwk/Vdet to 79/190 (launch values)
2000/221 17:55 Real-Time – Outer Stage Outgas Heater On
2000/221 20:05 Real-Time – CS and IS reached 318K

Wednesday, August 9, 2000

None

Thursday, August 10, 2000

2000/223 19:11 Real-Time – Turn off outgas heaters
2000/223 21:23 Real-Time – Turn on Timing Generator A
2000/223 21:24 Real-Time – Turn on Scan Assembly A
2000/223 21:25 Real-Time – Turn on Formatter A
2000/223 21:31 Real-Time – Set Formatter to Upload Mode
2000/223 21:38 Real-Time – Dump 9A(6,13,256,0,1,1)
2000/223 21:41 Real-Time – Long Dump 9B fails
2000/223 21:42 Real-Time – Halt Memory Transfer
2000/223 22:24 Real-Time – Dump 9C (7,1,262145,0,1,1)
2000/223 22:27 Real-Time – Dump 9D (7,1,262147,0,1,1)
2000/223 22:28 Real-Time – Dump 9E (6,32,53760,1,1,1)
2000/223 22:30 Real-Time – Long Dump 9B (7,500,525568,0,1,16)
2000/223 22:37 Real-Time – Formatter upload reset
2000/223 22:40 Real-Time – Dump 9A (6,13,256,0,1,1)

Friday, August 11, 2000

2000/224 01:05 Real-Time – Dump 9E (6,32,53760,1,1,1)
2000/224 01:05 Real-Time – Formatter upload reset
2000/224 01:07 Real-Time – Dump 9A (6,13,256,0,1,1)
2000/224 01:09 Real-Time – Dump 9E (6,32,53760,1,1,1)
2000/224 01:50 Real-Time – Dump 9E (6,32,53760,1,1,1)
2000/224 01:51 Real-Time – Formatter upload reset
2000/224 01:52 Real-Time – Dump 9A (6,13,256,0,1,1)
2000/224 01:53 Real-Time – Dump 9E (6,32,53760,1,1,1)
2000/224 01:54 Real-Time – Formatter upload reset
2000/224 01:56 Real-Time – Dump 9A (6,13,256,0,1,1)
2000/224 01:57 Real-Time – Dump 9E (6,32,53760,1,1,1)
2000/224 01:59 Real-Time – Standard Reset Formatter (to “normal mode”)
2000/224 02:03 Real-Time – Turn Formatter Off
2000/224 14:53:49 Real-Time -- Transition to A-side Science Mode
2000/224 14:56:20 Real-Time -- Turn off FIFO blocks
2000/224 14:57:53 Real-Time -- Formatter Upload Reset

This Week's Scheduled MODIS Activities Not Completed:

Sunday, August 6, 2000

2000/219 05:00:00 ATC Blackbody to 270K
2000/219 05:00:30 ATC Blackbody duty cycle to 33%

Monday, August 7, 2000

2000/220 03:00:00 ATC Blackbody to 290K
2000/220 14:00:?? Real-time – Set Itwk/Vdet to 79/190
2000/220 14:00:?? Real-time – Transition to Standby
2000/220 14:00:?? Real-time – Transition to Low Power
2000/220 14:00:?? Real-time – Turn on Cold Stage
2000/220 14:30:?? Real-time – Turn on Intermediate Stage
2000/220 16:30:?? Real-time – Turn on Outer Stage
2000/220 19:00 Attain 318K

Upcoming MODIS Events:

Upload flight software patches to better detect and track the formatter errors.

Maneuvers:

None

MODIS Anomalies:

Beginning about 6 PM EDT on Saturday, August 5th, the A-side formatter circuitry reset itself repeatedly. Approximately 90 resets were observed during a one hour period and then the formatter stabilized in upload mode. At 11:00pm EDT (August 5, 2000 03:00 GMT), due to conflicting telemetry indicators, MODIS was placed in low power mode with the mirror stopped and survival heaters enabled.

On Tuesday, August 8th, MODIS' timing generator, scan assembly, and formatter were powered on sequentially to isolate the anomaly. The timing generator and scan assembly were turned on successfully. When the formatter was powered on, more errors were observed. However, the formatter had cooled significantly during the time since MODIS was put into low power mode three days prior.

The timing generator, scan assembly, and formatter were powered again on Thursday and a series of memory dumps were performed. On Friday MODIS was transitioned to Science Mode, however, the FIFO memory blocks were turned off. This is considered a safe, stable state. During the next week, memory patches will be installed to better detect and track the formatter errors.

General Instrument Comments:

MODIS is in Science Mode on the A-side with the FIFO memory turned off. The SVD and NAD are both open.

MODIS Telemetry Trends:

Overall, MODIS temperatures had dropped significantly while MODIS was in low power mode. The blackbody temperatures were off-scale and the limits for these mnemonics were disabled. The formatter engine temperatures did reach yellow-low temperature limits at times, but the survival heaters kept the instrument safe from harm. The LWIR cold focal plane temperature saturated low and the SMIR temperature dropped to approximately 77K.

Non-MODIS Significant Events:

None.

Limited Life Item Status:

SRCA 10W Lamp #1: 173.3 of 500 hours
SRCA 10W Lamp #2: 135.9 of 500 hours
SRCA 10W Lamp #3: 145.1 of 500 hours
SRCA 10W Lamp #4: 61.5 of 500 hours

SRCA 1W Lamp #1: 555.8 of 4000 hours
SRCA 1W Lamp #2: 276.3 of 4000 hours

Solar Diffuser Door: 1393 of 3022 Movements
Nadir Aperture Door: 532 of 1316 Movements
Space View Door: 437 of 1316 Movements