**POLAR Spacecraft Status As of: Thurs 21 Nov, 12:00 EST**

*(Changes* from last week in bold border)

+----------+--------------+--------------+--------------+--------------+
| **Subs   | **NOAA-15K** | **NOAA-16L** | ##           | ##           |
| ystem/** |              |              | ### NOAA-17M | ### NOAA-18N |
|          | AM: 17:49=AN | PM: 15:04=AN |              |              |
| **Com    |              |              | AM: 22:23=AN | PM 13:49=AN  |
| ponent** | GAC data     | GAC data     |              |              |
|          | only         |              | GAC&LAC data | GAC & LAC    |
|          |              |              |              | data         |
+==========+==============+==============+==============+==============+
| **LA     | 05/13/98     | 09/21/00     | 6/24/02      | ####         |
| UNCHED** |              |              |              | ### 5/20/05  |
+----------+--------------+--------------+--------------+--------------+
| **CNTL   | OBP2         | OBP2         | OBP2         | OBP2         |
| OBP**    |              |              |              |              |
+----------+--------------+--------------+--------------+--------------+
| **BUS**  | B-BUS        | B-BUS        | B-BUS        | B-BUS        |
|          |              |              |              |              |
|          | XSU-1        | XSU-2:       | XSU-1        | XSU-1        |
|          |              | TOAR472      |              |              |
+----------+--------------+--------------+--------------+--------------+
| **BUS    | NO           | NO           | NO           | NO           |
| VETO**   |              |              |              |              |
+----------+--------------+--------------+--------------+--------------+
| *        | [Nominal     | ######       | ###### [N    | [Nominal     |
| *ADACS** | Mode]        | [RGYRO Mode] | ominal Mode] | Mode]        |
|          | {.underline} | {.underline} | {.underline} | {.underline} |
|          |              |              |              |              |
|          | Rg           | Estimate     | Rg           | Gyro-A       |
|          | mode=Monitor | Y-ROLL       | mode=Monitor | MIMU-2       |
|          |              |              |              |              |
|          | Gyro-3 Off   | Rg           | Gyro-3 Off   | Z-wheel      |
|          | 6/26/00 Gyro | mode=PASSIVE | 6/10/04      | -Pitch       |
|          | chans=AAB    |              |              |              |
|          |              | Gyros-1 & 3  | Gyro         | TOAR 447     |
|          | N2 Low PSI   | Inop/Off     | chans=AAB    |              |
|          | invalid      |              | GAS Enabled  | Z-momentum   |
|          |              | Gyro chans   | Dec 05       | transition   |
|          |              | XA-ZB        |              | complete     |
|          |              |              |              |              |
|          |              | Pitch wheel  |              | Pitch        |
|          |              | bias 2400    |              | Torquer      |
|          |              |              |              | again active |
|          |              | Gyro2 safe   |              |              |
|          |              | macro        |              |              |
+----------+--------------+--------------+--------------+--------------+
| **RXO**  | PRI          | PRI          | PRI          | PRI          |
|          |              |              |              |              |
|          | daily bias   | Daily Bias   | Daily Bias   | No daily     |
|          | -8 mS        | --5.5 mS     | --3 mS       | bias         |
|          |              |              |              |              |
|          | -500 mS      | -1500 mS     | -1500 mS     | -1500 mS     |
|          | 12/31/05     | 31Dec05      | 31Dec05      | 31Dec05      |
+----------+--------------+--------------+--------------+--------------+
| **CLOCK  | 2            | 2            | 2            | 2            |
| DIV**    |              |              |              |              |
+----------+--------------+--------------+--------------+--------------+
| **MIRP** | External     | External     | External     | External     |
|          | Synch        | Sync         | Sync         | Synch        |
|          | Rephase 0730 |              |              |              |
|          | daily        | Rephase each | Rephase      | Rephase      |
|          |              | orbit        | Enabled      | Enabled      |
+----------+--------------+--------------+--------------+--------------+
| **TIP    | 2            | 2            | 2            | 1            |
| SIDE**   |              |              |              |              |
|          | (since       | since        | Swapped      | Analog telem |
|          | 4/3/03)      | 4/18/05      | 9/20/06      | drifting     |
|          |              |              |              |              |
|          | 3 channels   | (analog      |              |              |
|          | inop         | drifting?)   |              |              |
+----------+--------------+--------------+--------------+--------------+
| **Rec    | DTRs 1, 2,   | DTRs 1, 2,   | DTR 1,3,4 /  | SSRs         |
| orders** | 3, 4         | 3, 4A        | SSR 2        | 1,2,3,4,5    |
|          | Safestate 1B |              |              |              |
| **(DTR,  | EOT          | Safestate 3A | S            | Safestate=5B |
| SSR)**   |              |              | afestate=SSR |              |
|          |              | 4B STIP only | 2B           | Current      |
|          |              |              |              | spikes       |
|          |              |              | 4A Pressure  |              |
|          |              |              | leak         |              |
+----------+--------------+--------------+--------------+--------------+
| **VTX**  | #1 ON        | OFF / INOP   | #2 ON        | #1 ON        |
|          |              |              |              |              |
| (APT     | As of 19     | since        | 137.62 MHZ   | 137.1 MHZ    |
| data)    | June 07      | 11/15/00     |              |              |
|          |              |              |              | As of 16 Aug |
|          |              |              |              | 07           |
+----------+--------------+--------------+--------------+--------------+
| **BTX**  | #1           | #2           | ####### #2   | #1           |
|          |              |              |              |              |
|          | 137.35 MHZ   | 137.77 MHZ   | 137.77 MHZ   | 137.35 MHZ   |
+----------+--------------+--------------+--------------+--------------+
| **STX**  | 2-Omni HRPT  | 2 -- HRPT    | 3 -- HRPT    | 1 - HRPT     |
|          |              |              |              |              |
| 1 = rcp  | 2 Omni=rcp   | 1-- Playback | TOAR424 low  | 3 - Playback |
| 1698.0   |              |              | power        |              |
| mhz      | Power TOAR   | 4 Restored   |              | 2-Playback   |
|          | 446          | -11 Oct 2007 | 2 & 1        |              |
| 2 = lcp  |              |              | Playback     | 4-Test &     |
| 1702.5   | 4-Playback   | 3 low power  |              | Standby      |
| mhz      |              | INOP -10 Aug | STX-1 Power  |              |
|          | 1,           | 2007         | drop         |              |
| 3= rcp   | 2,3-Degraded |              |              |              |
| 1707.0   |              |              | STX-4 no     |              |
| mhz      |              |              | modulation   |              |
|          |              |              |              |              |
| 4= rcp   |              |              |              |              |
| 2247.5   |              |              |              |              |
| mhz      |              |              |              |              |
+----------+--------------+--------------+--------------+--------------+
| #        | [Array Off   | [Array Off   | [Array Off.  | [Array Off.  |
| ## POWER | -45]         | -20]         | --40]        | -40]         |
|          | {.underline} | {.underline} | {.underline} | {.underline} |
| (Array   |              |              |              |              |
| offset   | [Since       | [Since       | [Since       | [Since       |
| and CANT | 1/25/01]     | 9/13/]{.     | 1/29/04]     | 6/6/05]      |
| angle,   | {.underline} | underline}07 | {.underline} | {.underline} |
| eclipse  |              |              |              |              |
| states   | Full Sun     | Eclipse all  | Eclipse all  | Eclipse all  |
| and sun  |              | year         | year         | year         |
| angle)   | Sun Angle 13 |              |              |              |
|          |              | Sun Angle 34 | Sun Angle at | Sun Angle 63 |
|          | Uptrend to   |              | 66           | uptrend to   |
|          | 18 early Jan | Steady trend |              | 65 on        |
|          | 07           |              | Steady trend |              |
|          |              | SA CANT=22   |              | 1 Jan 07     |
|          | SA CANT=37   | degs         | SA CANT=37   |              |
|          | degs         |              | degs         | Batts        |
|          |              | Full sun S/C |              | 1-3=LRC      |
|          |              | in Sept 07   | BVR Phase    |              |
|          |              |              | Control      | BVR Phase    |
|          |              | BVR Phase    | auton swap   | Control      |
|          |              | Control      | 9/17/07      | auton swap   |
|          |              | auton swap   |              | 3/29/06 &    |
|          |              | 7/19/07      | Swap back    | 1/4/07       |
|          |              |              | 9/18/07      |              |
+----------+--------------+--------------+--------------+--------------+
| *        | Nominal      | Nominal      | ### Nominal  | Nominal      |
| *AVHRR** |              |              |              |              |
|          | Channel 3B   | Recent SM    | 3A-B switch  | Channel 3B   |
|          | only         | current      | enabled      | only         |
|          |              | increases    |              |              |
|          | Occasional   |              | Previous     | Scan motor   |
|          | minor scan   | TCE24 OFF    | scan motor   | current drop |
|          | motor        | 4/14/04      | current mini | 29 Aug 06    |
|          | i            |              | surges       |              |
|          | nstabilities | Channel 3B   |              |              |
|          |              | only         |              |              |
+----------+--------------+--------------+--------------+--------------+
| **A      | Operational  | Operational  | OFF/INOP     | Nominal      |
| MSU-A1** |              |              |              |              |
|          | Ch14         | Primary PLLO | Since        | Full Scan    |
|          | inoperative  | chans 9-14   | 10/30/03     | mode         |
|          |              | bias shift.  |              |              |
|          | Ch11         |              | Survival     |              |
|          | inoperative  | Backup PLLO  | heat on.     |              |
|          |              | inop.        |              |              |
|          |              |              |              |              |
|          |              | Channel 9-14 |              |              |
|          |              | noise        |              |              |
+----------+--------------+--------------+--------------+--------------+
| **\`A    | Nominal      | Nominal      | Nominal      | Nominal      |
| MSU-A2** |              |              |              |              |
+----------+--------------+--------------+--------------+--------------+
| **       | Operational  | Operational  | Nominal      | ***Replaced  |
| AMSU-B** |              |              |              | by MHS***    |
|          | Bias in All  | Space        |              |              |
|          | Chans.       | Position-3   |              |              |
|          |              |              |              |              |
|          | Degraded     | Chan-8       |              |              |
|          | Chan-3       | degradation  |              |              |
+----------+--------------+--------------+--------------+--------------+
| ### HIRS | NOMINAL      | NOMINAL      | NOMINAL      | ########     |
|          |              |              |              | Operational  |
|          | FW Abrupt    | New all time | 1 Pixel      |              |
|          | return to    | high filter  | cross-track  | Filter Heat  |
|          | nominal      | motor        | m            | OFF.         |
|          | 7/12/05      | current      | isalignment. |              |
|          |              | reached      |              | ########     |
|          | After years  | 9/17/06.     |              |  LW channel  |
|          | of minor and |              |              | 1-12 noise T |
|          | major        | Imagery      |              | OAR 448 Loos |
|          | current      | occasionally |              | e LWIR lens. |
|          | surges       | exhibits     |              |              |
|          |              | high levels  |              | LW imagery   |
|          | FW mode=Hi   | of           |              | erratic.     |
|          | Powr         | radiometric  |              |              |
|          |              | noise        |              |              |
+----------+--------------+--------------+--------------+--------------+
| ###      |              |              |              | Nominal      |
|  MHS/MIU |              |              |              |              |
|          |              |              |              | Fly Wheel    |
|          |              |              |              | Motor        |
|          |              |              |              | Current      |
|          |              |              |              | Spiking but  |
|          |              |              |              | not alarming |
|          |              |              |              | since 27 Dec |
|          |              |              |              | 06           |
|          |              |              |              |              |
|          |              |              |              | Entered      |
|          |              |              |              | Motor Spin   |
|          |              |              |              | State on 27  |
|          |              |              |              | March 07     |
|          |              |              |              |              |
|          |              |              |              | H4 gain      |
|          |              |              |              | increased 2  |
|          |              |              |              | Oct 07       |
|          |              |              |              |              |
|          |              |              |              | H3 gain      |
|          |              |              |              | increased    |
|          |              |              |              | 31Oct 07     |
+----------+--------------+--------------+--------------+--------------+
| **DCS**  | Nominal      | Nominal      | Nominal      | Nominal      |
|          |              |              |              |              |
| RFI      |              | Pseudo       |              | DRU's 1-7 On |
| inves    |              | message      |              |              |
| tigation |              | turned on    |              | DRU8         |
|          |              | 1/5/06       |              | inop/off     |
+----------+--------------+--------------+--------------+--------------+
| **SARR** | Operational  | Operational  | Nominal      | Nominal      |
|          |              |              |              |              |
|          | A-Side, AGC  | Mode =AA     | A-side       | A-Side       |
|          | Mode         |              |              |              |
|          |              | A-side, AGC  | All AGC Mode | All AGC Mode |
|          | Intermittent | Mode         |              |              |
|          | failures for |              |              | Since 15 Aug |
|          | 243MHz A&B   | (B-side in   |              | 05           |
|          |              | FG mode)     |              |              |
|          |              |              |              |              |
|          |              | 243 MHz =    |              |              |
|          |              | INOP.        |              |              |
+----------+--------------+--------------+--------------+--------------+
| **SARP** | Nominal      | Nominal      | Nominal      | Nominal      |
|          |              |              |              |              |
|          | RCVR B/W = 2 | RCVR B/W = 2 |              | A-side 23    |
|          |              |              |              | May05        |
+----------+--------------+--------------+--------------+--------------+
| **SEM**  | Nominal      | Nominal      | Nominal      | Nominal      |
|          |              |              |              |              |
|          | E            | E            | E            | El           |
|          | -CDEM-HVPS=2 | -CDEM-HVPS=6 | -CDEM-HVPS=2 | ec-CH-HVPS=1 |
|          |              |              |              |              |
|          | P            | P            | P            | 27 June 06   |
|          | -CDEM-HVPS=0 | -CDEM-HVPS=5 | -CDEM-HVPS=4 | 17:00z       |
|          |              |              |              |              |
|          |              | 27 Jun       | 27 June 06   | Pr           |
|          |              | 0615:30z     | 16:00z       | ot-CH-HVPS=0 |
+----------+--------------+--------------+--------------+--------------+
| **SBUV** |              | Operational  | Nominal      | Nominal      |
|          |              |              |              |              |
|          |              | Degraded     | Anode Mode   | Anode mode   |
|          |              | Ozone data   |              |              |
|          |              |              | Plan sweep   | since 6 July |
|          |              | Backup       | mode         | 05 13:30z    |
|          |              | Diffuser     |              |              |
|          |              | inop         | Standard Ops | Electronics  |
|          |              |              |              | turnoff      |
|          |              | Primary      | TOAR 463 sun | taken out of |
|          |              | Diffuser     | glint        | STESM        |
|          |              | deployment   |              | safestate    |
|          |              | problem TOAR | IBSL test    | table        |
|          |              | 426          | performed 12 |              |
|          |              |              | Sept 06      | TOAR 462 sun |
|          |              | AMSU EMI     |              | glint        |
|          |              | causing      | Grating      |              |
|          |              | erratic      | motor        |              |
|          |              | Behavior in  | i            |              |
|          |              | PMT cathod,  | nvestigation |              |
|          |              | range 3      |              |              |
+----------+--------------+--------------+--------------+--------------+
| **       |              | ON           | ON           | ON           |
| SADPOS** |              |              |              |              |
|          |              | Enabled      | ENABLED      | Enabled      |
|          |              | MFactor50%   |              |              |
|          |              |              | Timer =      | Timer =12    |
|          |              | Timer = 12   | 12mins       | mins         |
|          |              | mins         |              |              |
+----------+--------------+--------------+--------------+--------------+
| **T      | TCE26 & 15H  | Nominal      | TCE3H Batt   | All TCE's    |
| HERMAL** |              |              | 2A heater    | active       |
|          | Telem valid  | TCE24 OFF    | failed ON,   |              |
| Heaters, |              | 4/14/05      | turned off   | HIRS filter  |
| louvers  | TOAR 432     |              | 8/26/03      | heater       |
|          | closed       | (AVHRR H&L)  |              | turned OFF   |
| TCE's    |              |              | AMSU-A1      | 9/28/06      |
|          | TCE24L&25L   | HIRS Filter  | survival     |              |
|          | (HIRS &      | heater       | heaters on   |              |
|          | AVHRR)       | turned OFF   | 10/29/03     |              |
|          | failed       | 1/18/05      |              |              |
|          | 5/13/98      |              |              |              |
|          |              |              |              |              |
|          | RCE          |              |              |              |
|          | thermostat   |              |              |              |
|          | failed       |              |              |              |
|          | 5/13/98      |              |              |              |
|          |              |              |              |              |
|          | Spacecraft   |              |              |              |
|          | in thermal   |              |              |              |
|          | uptrend      |              |              |              |
+----------+--------------+--------------+--------------+--------------+

**COMMENTS/CHANGES:**

MISC: SIMPACT Board on the DEV Rail is now operational. More testing of
the OPS Rail SIMPACT boards are TBD.

NOAA-15: There were relatively no changes to the NOAA-15 payload health
situation during the past week.

No significant change in the IMU performance. Yaw gyro is as quiet as it
has been in four months.

NOAA-16: There was relatively no change in the performance of the
NOAA-16 payload or bus subsystems during the past week.

NOAA-17: There was relatively no change in the performance of the
NOAA-17 payload or bus subsystems during the past week.

NOAA-18: There were relatively no changes to the NOAA-18 health
situation during the past week.

After the quick 6 degree rise in temperature at the end of September of
the N18 AMSU-A2 DC Converter; the component temperature has been
trending on track with the curves of the past two years. It should reach
a local maximum of approximately 310.5 K at the end of December (over 10
degrees below the recommended maximum limit of this component). Figure 2
shows the long term trend of this point. No other component of the
instrument shows any sign of problems related to this as of yet
unexplained change in component performance. A TOAR has been submitted.

The \"popcorn\" noise that appeared last week on 14-15 Nov 2007
(2007/318-319) on the N18 AMSU-A1 has not manifested itself since the
final small occurrence observed on 16 Nov 2007 (2007/320). Figure 3
highlights the largest magnitudes and durations of noisy data observed
on 14-15 Nov 2007 (2007/318-319). A TOAR has been submitted. Two
software patches were loaded to NOAA-18 on 20 Nov 2007. Forced GYE won't
use pitch data if it is available and SCPs will not update MIMU ID form
telemetry if L7 interrupts are disabled.

MetOp-A: [Trend Observations (NOAA Instruments) ]{.underline}

·         The A-DCS, SARR, SARP and SEM temperatures all dropped on 18
Nov 2007 as IASI experienced another SEU/SET anomaly that triggered an
autonomous transition to STANDBY/REFUSE at 01:31 UTC.  The SEM DPU saw
the largest temperature drop of approximately 5 deg C (the other
instruments saw a drop of 0.5 -- 1.0 deg C).  The temperatures are not
fully recovered yet, as IASI is still only in HEATER2 mode.

·         The AVHRR and HIRS cooler efficiencies (i.e. Patch Power) and
science data have not been affected by the IASI anomaly or the recovery
procedures to date.  It is important to note, however, that the HEATER2
mode is not the same mode that is used for IASI Decontamination (HEATER1
mode).

·         All other housekeeping telemetry and science data were stable
during this reporting period.  All performance data is well within
specification (NEDT, NEDN).

·         HIRS Filter Wheel re-sync period continued its slight
increasing trend, averaging about 97 seconds this week.  This correlates
with the SVM CCU oscillator temperature, which is also still showing a
slight increasing trend.

 

[Anomalies]{.underline}

·         **AR8360, "HIRS Scan Mirror Temperature Out-of-Limits"**:  Two
recurrences of this anomaly were observed on Wednesday, 14 Nov 2007.  
ITT is investigating this and has developed a fault tree for identifying
a likely cause.  Currently waiting on EUMETSAT PA to call the next ARB.

·       **AR8154, "HRPT SSPA Failure"**:  No change in status.  SSST
states that the most likely cause is due to a failed CLY38 transistor,
failing in short-circuit on one of the two parallel output stages.  An
MSG-based design change is expected for MetOp-B and C, but the final
report and recommendation from SSST is still outstanding (due by Dec/Jan
timeframe).

·         **AR8310, "HIRS Filter Wheel Resynch Rate"**:  No change in
status.  Originally submitted on August 8 in response to an SIOV action
item.  This AR is intended to get confirmation from Astrium that the
more frequent FW resynchs observed now in orbit compared to the rate
observed during ground testing can be attributed to temperature effects
on the 1 Hz and 1.248 MHz oscillators.

·         **AR8877, "PMC Time Stamp Wrap Around Anomaly":  ** The PMC
wrap around occurred on Sunday, Nov. 11, and affected the files produced
by the CAL/VAL facility in the so called NOAA EGSE FORMAT. A certain
number of files for day 316 (SEM, AMSU, HIRS, AVHRR files) have packets
with incorrect time stamps (UTC plus UNIX time in the header).

·         **AR8903, "IASI Autonomous Transition to STANDBY/REFUSE": **
IASI had another autonomous transition to STANDBY/REFUSE this past week
(Sunday, 18 Nov 2007 @ 01:31 UTC), apparently due to another SEU/SET. 
The anomaly occurred over the SAA.

>  

[Operations Performed]{.underline}

·         EUMETSAT and CNES have worked the recovery of IASI from
STANDBY/REFUSE.  As of Wednesday, 21 Nov 2007, the instrument was still
in HEATER2 mode awaiting the CBS 3^rd^ stage stabilization before
proceeding to the next step in returning to nominal operations.

·         The SEM IFCs were run on their regular schedule.  On Tuesday,
20 Nov 2007 the TED IFC started at 09:20:46 UTC and the MEPED IFC
started at 09:22:06 UTC.

 

[Operations Planned]{.underline}

·         SEM IFCs are planned for 27 Nov 2007. 

NOTES: Figure 1 has been omitted for web listing

![](media/image4.jpeg){width="8.891666666666667in"
height="6.497222222222222in"}

Figure 2 NOAA-18 AMSU-A2 (2005/070-2007/330)

![](media/image5.jpeg){width="8.891666666666667in" height="6.625in"}

Figure 3 NOAA-18 AMSU-A1 (2007/317-320)