Topic:  NOAA-21 Drag Make-Up Maneuver (DMU) 008 Scheduled for April 23, 2025

Date/Time Issued: April 21,2025 1923Z

Product(s) or Data Impacted:  All NOAA-21 Sensor Data

Date/Time of Initial Impact: April 23, 2025 16:07:25Z

Date/Time of Expected End: April 23, 2025 16:48:12Z

Length of Outage:  See Details.

Details/Specifics of Change: On April 23, 2025 16:38:00Z,
NOAA-21 will perform a 16.0 second propulsive Drag Makeup Maneuver (DMU)
to maintain Mean Local Time of the Ascending Node while controlling Repeating Ground Track box.

The following observatory systems will be affected on April 23, 2025:
16:22:50Z - 16:47:22Z OMPS in Decon mode, Science data will not be available
16:32:51Z - 16:48:06Z  HRD will be off, data for direct broadcast users will be unavailable
16:32:52Z - 16:46:20Z N21 pointing off-nadir, collected data during that time period may be impacted and not disseminated

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