Correction: AVHRR Scan Motor remains unstable but is not stalled. At this time, NOAA-15 AVHRR products continue to be affected by the scan motor issue. The instrument is being monitored to see if the scan motor breaks free and returns back to a nominal scan mode.

Update # 1: AVHRR Scan Motor remains instable but not stalled. AVHRR products continued to be affected. We are in a wait mode to see if the scan motor breaks free.

Topic: NOAA-15 AVHRR Scan Motor Current Increase Event

Date/Time Issued: July 24, 2019 1834Z

Product(s) or Data Impacted: AVHRR Products

Date/Time of Initial Impact: July 23, 2019 0435Z

Impacts on Users and Significance: AVHRR products are affected.

Date/Time of Expected End: Unknown

Length of Outage: Ongoing

Details/Specifics of Change: The NOAA-15 AVHRR Scan Motor current began showing signs of instability at approximately 0400Z on July 23, 2019. At about 0435Z the current rose sharply to about 302mA where it has remained. Scan motor temperature began rising about the same time and is currently steady at ~26M-0C. Black body temperatures dropped sharply at about the same time. The instrument appears to no longer be producing data.
This behavior is consistent with a scan motor stall, but requires further investigation. Options for recovery are limited.

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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