Topic:  NOAA-18 HIRS Filter Wheel Current Increase Event

Date/Time Issued: May 8, 2025 0238Z 

Product(s) or Data Impacted:  HIRS Products

Date/Time of Initial Impact:  May 5, 2025 1745Z

Date/Time of Expected End:  Unknown

Length of Event:  Ongoing

Details/Specifics of Change:
On Monday, May 05 2025 (J-day 175), the NOAA-18 HIRS HIRS Filter Wheel Motor current abruptly jumped from 324 mA to 504 mA at 17:45 UTC.  It then ramped down to about 472 mA, where it has since stabilized.  The Filter Wheel Motor and Housing Temperatures have since stabilized in the low 35° C.

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