Topic: NOAA-18 HIRS Filter Wheel Current Increase Event

Date/Time Issued: March 7, 2019 1846Z

Product(s) or Data Impacted: HIRS Products

Date/Time of Initial Impact: March 6, 2019 0800Z

Impacts on Users and Significance: HIRS products are affected.

Date/Time of Expected End: Unknown

Length of Outage: Ongoing

Details/Specifics of Change:

The NOAA-18 HIRS HIRS Filter Wheel Motor (FWM) current began showing signs of instability at approximately 04:00 UTC on March 6, 2019 (jday 065). The Filter Wheel Motor and Housing Temperatures have since stabilized in the low 30 degree centigrade range.

This behavior is consistent with a filter wheel stall, but requires further investigation. Options for recovery are limited and no products can be generated at this time.

Updates will follow pending ARB (Anomaly Review Board) investigation.

Contact Information for Further Information: ESPC Operations at at 301-817-3880 and/or other contacts as necessary

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

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