| Date | Mechanism | Anomaly Description | Notes |
|---|---|---|---|
| 7/May/2001 | Cryocooler B | Failure of cooler displacer B |
- Cooler compressor B set to 82.5%. - Cryocooler A set to higher amplitude to increase cooling capability. - Detectors 1 to 4 (Side B) inoperable. |
| 4/Aug/2001 | Chopper 3 | Complete failure | - Stopped at open position. |
| 19/Mar/2002 | Terra Satellite | Terra went into safe mode |
- MOPITT entered safe mode. - MOPITT back to science mode 25/Mar/2002. |
| 6/Apr/2002 | Mirror 1 | Complete failure. | - On the inoperable (B) side of MOPITT |
| 13/Dec/2002 | Cryocooler B | Cooler displacer B hit its end-stop | - Continued to operate normally after re-start. |
| 16/Dec/2003 | Terra Satellite | Terra went into safe mode |
- MOPITT entered safe mode. - MOPITT back to science mode 29/Dec/2003. |
| 28/Jul/2009 | Cryocooler B | Cooler displacer B hit its end-stop |
- Cooler compressor B set from 82.5% to 77.5%. - Cooler A settings were unchanged. |
| 3/Oct/2009 | Sieve 3 | Sieve 3 heater turned off |
- pressure in LMC 3 dropped by 3.2 kPa - Re-activated after MOPITT reset command in Mar/2011. |
| 2/Dec/2010 | Sieve 1 | Sieve 1 heater turned off |
- On the inoperable (B) side of MOPITT - Re-activated after MOPITT reset command in Mar/2011. |
| 18/Feb/2016 | Terra Satellite | Terra went into safe mode |
- MOPITT entered safe mode. - MOPITT back to science mode 2/Mar/2016. |
| 12/Dec/2017 | Sieve 1 | Sieve 1 heater turned off |
- On the inoperable (B) side of MOPITT - Re-activated after MOPITT reset command in Mar/2018. |
| 27/Sep/2018 | Terra Satellite | Terra went into safe mode |
- MOPITT entered safe mode. - MOPITT back to science mode 4/Oct/2018. |
| 26/Jul/2019 | Sieve 4 | Sieve 4 heater turned off |
- Caused PMC 2 amplitude to drop from 6.4 mm to 2.5 mm. - Re-activated after MOPITT reset command in Aug/2019. - PMC 2 returned to normal operational state. |
| 13/Aug/2019 | PMC 2 | PMC 2 vibration events began |
- PMC 2 caused transient vibrations in the system. - These events have since been occurring randomly since. - When MOPITT telemetry indicates such as event has occurred, the data is flagged and excluded from retrievals. |
| 31/Mar/2021 | Dewar Heater | Dewar nest heater 1 and 2 |
- Nest heater 1 and 2 unexpectedly turned on during MOPITT decontamination. - Both nest heaters were turned off, and the instrument was allowed to warm up naturally. - Future decontamination events allow the detectors to heat up naturally rather than using the heaters. |
| 11/Aug/2024 | PMC 2 | PMC 2 failure |
- The position of the piston of PMC 2 began to oscillate, accompanied by an increase in PMC 2 motor current and temperature. - PMC 2 was turned off. - MOPITT retrievals had to be modified to account for the loss of this data. |
