**POLAR Spacecraft Status As of: Tues 21 Aug 07, 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&LAC 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-1:       | XSU-1        | XSU-1        |
|          |              | TOAR444      |              |              |
+----------+--------------+--------------+--------------+--------------+
| **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 off        |              | 2-Playback   |
|          | 446          | INOP-10 Aug  | 2 & 1        |              |
| 2 = lcp  |              | 2007         | Playback     | 4-Test &     |
| 1702.5   | 4-Playback   |              |              | Standby      |
| mhz      |              | 3 low power  | STX-1 Power  |              |
|          | 1,           | INOP -10 Aug | drop         |              |
| 3= rcp   | 2,3-Degraded | 2007         |              |              |
| 1707.0   |              |              | STX-4 no     |              |
| mhz      |              |              | modulation   |              |
|          |              |              |              |              |
| 4= rcp   |              |              |              |              |
| 2247.5   |              |              |              |              |
| mhz      |              |              |              |              |
+----------+--------------+--------------+--------------+--------------+
| #        | [Array Off   | [Array Off   | [Array Off.  | [Array Off.  |
| ## POWER | -45]         | -40]         | --40]        | -40]         |
|          | {.underline} | {.underline} | {.underline} | {.underline} |
| (Array   |              |              |              |              |
| offset   | [Since       | [Since       | [Since       | [Since       |
| and CANT | 1/25/01]     | 7/16/]{.     | 1/29/04]     | 6/6/05]      |
| angle,   | {.underline} | underline}02 | {.underline} | {.underline} |
| charge & |              |              |              |              |
| V/T      | Full Sun     | Eclipse all  | Eclipse all  | Eclipse all  |
| rates,   |              | year         | year         | year         |
| eclipse  | Sun Angle 13 |              |              |              |
| states   |              | Sun Angle 34 | Sun Angle at | Sun Angle 63 |
| and sun  | Uptrend to   |              | 66           | uptrend to   |
| angle)   | 18 early Jan | Steady trend |              | 65 on        |
|          | 07           |              | Steady trend |              |
|          |              | Batts 1-3=   |              | 1 Jan 07     |
|          | Batts 1-3=   | LRC          | Batts 1-3=   |              |
|          | LRC          |              | LRC          | Batts        |
|          |              | V/T=4/8      |              | 1-3=LRC      |
|          | V/T=7/9      |              | V/T= 4/8     |              |
|          |              | SA CANT=22   |              | Batts 1-3    |
|          | SA CANT=37   | degs         | SA CANT=37   | V/T=4/8      |
|          | degs         |              | degs         |              |
|          |              | T            |              | SA CANT=22   |
|          |              | ransitioning |              |              |
|          |              | to full sun  |              | BVR Phase    |
|          |              | S/C in Sept  |              | Control      |
|          |              | 07           |              | auton swap   |
|          |              |              |              | 3/29/06 &    |
|          |              | BVR Phase    |              | 1/4/07       |
|          |              | Control      |              |              |
|          |              | auton swap   |              |              |
|          |              | 7/19/07      |              |              |
+----------+--------------+--------------+--------------+--------------+
| *        | 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     |
+----------+--------------+--------------+--------------+--------------+
| **MSU**  |              |              |              |              |
+----------+--------------+--------------+--------------+--------------+
| **SSU**  |              |              |              |              |
+----------+--------------+--------------+--------------+--------------+
| **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: Planning for a partial solar eclipse on 11 Sep 2007 is being
planned.

NOAA-15: There were relatively no changes to the NOAA-15 payload health
situation during the past week. N-15 has come out of summer eclipse
season.  EPS in nominal

No new updates on #2 gyro since last week. Latest yaw updates are shown
in Figures 1.

NOAA-16: There was relatively no change in the performance of the
NOAA-16 payload subsystems during the past week and the rest of the
spacecraft subsystems were also nominal during this time.

No updates in the STX-3 & 4 issues. A test for both STX-3 & 4s are being
planned, no firm date yet.

A request from NASA has been made to move the SA from -40 to -35 so the
shunts are always on to possibly avoid the spikes on the recorders. An
evaluation and a date for move is TBD. NOAA-16 will be in full sunlight
beginning in mid-September. This is the first time ever it will not be
eclipsing.

NOAA-17: There was relatively no change in the performance of the
NOAA-17 payload subsystems during the past week. The HIRS filter wheel
period noise calmed down this week.

No updates or conclusion were reached about the Attitude disturbance on
17 July 2007. The investigation continues.

NOAA-18: There were relatively no changes to the NOAA-18 health
situation during the past week. MHS DC offsets is still being
investigated.

The VTX was switched from side 2 to 1 on 16 Aug 2007 at 14:43.

MetOp A: No significant changes reported on the NOAA instruments on
MetOp. The HRPT transmitter failure investigation continues.

 [Trend Observations (NOAA Instruments) ]{.underline}

·       All housekeeping telemetry and science data were stable during
this reporting period. 

·       HIRS Filter Wheel resyncs have remained at the same approximate
rate as reported last week (approximately once every 93 seconds).

 

[Anomalies]{.underline}

·        **AR8360, "HIRS Scan Mirror Temperature Out-of-Limits"**: 
Anomalous temperature telemetry was observed between August 6-8, but has
returned to nominal since then.  There was also a correlation observed
between jumps in the Scan Mirror Temperature telemetry and slight drops
in the Patch Power.  This is currently under investigation by ITT.  An
ARB with EUMETSAT and NOAA is planned for Thursday, August 23, at 16:00
CET.

·         **AR8154, "HRPT SSPA-A Failure"**:  Investigations continued
on trying to isolate the cause of the HRPT SSPA failure.  An ARB was
held on August 20 to review the latest test results.  The breadboard
tests at Tesat have agreed well with in-orbit measurements.  The
investigation is circling in on a transistor that is used twice in the
SSPA:  the CLY38 transistor.  The observed behavior (8-10 dB lower RF
power) would be consistent with one of the two resistors having a short
circuit.  The same resistor is used in the MSG (Meteosat Second
Generation) design, where a similar in-orbit SSPA failure occurred. 
Astrium, Tesat and EUMETSAT are considering another in-orbit test later
this week, if they can improve the measurement resolution in order to
determine whether the RF power reduction is truly 10 dB (to confirm the
CLY38 transistor as the failed component).  Tesat also took the action
to use some available MSG modules and expose them to additional
radiation testing (to investigate whether an SEU/SET or IESD
susceptibility is present).  The HRPT will remain OFF until further
notice (no near term plans for switching ON with the redundant chain) .

 

[Operations Performed]{.underline}

·         The SEM IFCs were run on Tuesday, August 14, with the TED IFC
starting at 08:07:37 UTC and the MEPED IFC starting at 08:08:57 UTC.

 

[Operations Planned]{.underline}

·         The SEM IFCs will be run again on their weekly schedule
(Tuesday, Aug 21).

Notes: Figure 1has been omitted for web listing.