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