Update #1: Due to Fairbanks CDA commanding issues, this effort started at 15:13 UTC. The MHS science data was brought back online at 20:12 UTC. MIU and MHS configurations are under review by engineering.

Topic: NOAA-19 MHS Outage due to MIMU-2 to MIMU-1 Swap

Date/Time Issued: April 2, 2018 2226Z

Product(s) or Data Impacted: MHS Sounding Products

Impacts on Users and Significance: MHS sounding products will be impacted.

Date/Time of Initial Impact: April 2, 2018 1330Z

Date/Time of Expected End: April 2, 2018 1630Z

Length of Outage: ~3 Hours

Details/Specifics of Change: MIMU-2 x-axis laser gyro is currently degrading at a fast rate, with an estimated failure at the end of April. As a result, NOAA-19 needs to be switched from MIMU-2 to MIMU-1. This will cause the MHS to lose its 10 Hz clock signal, which will cause it to enter fault mode. The MHS needs to then be recovered from fault mode and placed back in scan mode.

Contact Information for Further Information: ESPC Operations at ESPCOperations@noaa.gov at 301-817-3880 and/or other contacts as necessary

Web Site(s) for applicable information: N/A

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