See https://cxc.harvard.edu/mta/SOT_reports/sot-shift.html Report M8435 Start at 237:18:20 GMT = 2:50pm, Thursday August 25 End at 237:21:45 GMT = 5:45pm, Thursday August 25 HRC Personnel: Dan Patnaude, Ralph Kraft, Paul Nulsen, Grant Tremblay, and Tom Gauron PLAN: ----- Execute Part 2 of CAP 1631: HRC-I Checkout Activity #2 on Side-A Electronics NOTES/ISSUES/PROBLEMS: ---------------------- At the start of comm, the CEA HVPS bracket temperature was at 5.9C SCS 91 controls MCP HV ramp up and ramp down. The loads were expecting SCS 91 to be enabled. However, when we came up on comm, SCS 91 was currently disabled, and therefore SCS 89 did not run as expected. We received approval to enable and activate SCS 91. SCS 89 then proceeded to run and auto ramp-up occurred 6 minutes later than anticipated. SCS 91 was disabled at the end of CAP 1618. The new HRC ATSs expect that it has been inactive. This is why when commands were called to activate it, the ramp up did not happen. At the end of this activity, SCS 91 is currently inactive, but its status will be checked ahead of the next HRC activity. Secondary science corruption became noticeable beginning at 20:28UT At the end of the activity, the CEA HVPS bracket temperature was reported to be 9.68C SUMMARY: -------- The CAP and data acquisition was completed. The only issue concerned the state of SCS 91 at the start of the CAP. This was addressed in real time. TIMELINE (GMT day 237): ----------------------- 18:54z SCS 135 cleared and disabled 19:52z 2CEAHVPT reports 7.6C 20:12z 2CEAHVPT reports 8.0C 20:28z 2CEAHVPT reports 8.4C 20:48z 2CEAHVPT reports 8.8C 21:09z 2CEAHVPT reports 9.25C 21:30z 2CEAHVPT reports 9.68C 21:45z HRC was successfully returned to an inactive state UTC 2022:237:18:21:01 (Aug25) f_ACE 1.75e+01 F_CRM 0.00e+00 Kp 0.0 R km 145115A OBT 2022:237:18:20:44 CTUVCDU 2019434 OBC s/w NRML FMT2_NORM CPEstat NORM OBT 777838844.38 ONLVCDU 2019424 OBC Errs 0 OBSID 24033 EPState SUN SIM TTpos 92903 HETG Angle 77.96 PCADMODE NMAN RA 264.784 Bus V 28.05 SIM FApos -535 LETG Angle 76.09 PCONTROL NPNT Dec -30.412 Bus I 22.63 AOFSTAR GUID Roll 271.315 ACA Object FFFSSSSS Dither ENAB HRC-I HV OFF ACA ImFunc RRRNNRNR Dith Yang -6.88 Yaw Rate 47.25 HRC-S HV OFF ACA CCD Temp -8.8 Dith Zang 2.64 Pitch Rate -9.19 SHLD HV 0.0 ACA Int Time 1.698 Roll Rate 37.00 EVT RT 4844 AOACSTAT OK FSS SunBeta SUN SHLD RT 0 FSS Alfa -0.55 Batt 1 SOC 100.00% Avg HRMA Temp 72.33 FSS Beta -23.41 Batt 2 SOC 100.00% A -15 V -0.62 Avg OBA Temp 65.76 SA Resolv 112.85 Batt 3 SOC 100.00% A +15 V 2.81 OBA Tavg Fault NFLT SA Sun Pres ILLM A +5 V 4.84 OBA Trng Fault NFLT +Y SA Amps 11.21 A +24 V 0.00 HRMA power 70.60 SCS 128 ACT -Y SA Amps 10.83 OBA power 70.20 SCS 129 ACT +Y SA Temp 112.35 SCS 130 DISA -Y SA Temp 112.04 ACIS Stat7-0 64 Roll Mom. 7.756 SCS 131 ACT Cold Rad -125.5 Pitch Mom. -10.417 SCS 132 ACT Ephin Temp 0.0000 Warm Rad -82.0 Yaw Mom. -7.102 SCS 133 DISA EIO Temp 0.0000 RadMon ENAB PMTANKP 134.145 SCS 107 INAC EPH temp 115.28 UpLCmdAcc 23598 IRU2G2 curr 120.00 M Unload MON Cmd Rej A 218 IRU2G1 curr 93.60 Roll Bias 1.0762 TSC Move STOP Prop. line 03 158.73 Pitch Bias -3.1440 FA Move STOP CTX B PWR 36.69 Prop. line 04 145.12 Yaw Bias -1.6834 OTG Move DISA CTX B Volts 3.54