Topic: NPP Inclination Adjustment Maneuver (IAM) scheduled for November 18, 2021

Date/Time Issued: November 18, 2021 1518Z

Product(s) or Data Impacted: All N20 Sensor Data

Date/Time of Initial Impact: November 18, 2021 17:36:24z

Date/Time of Expected End: November 18, 2021 18:52:52z

Length of Outage: 26 minutes, 28 seconds.

Details/Specifics of Change: On November 18, 2021 17:56:24Z, NPP will perform a 356.9 second propulsive Inclination Adjustment Maneuver (IAM) to maintain Mean Local Time of the Ascending Node while controlling Repeating Ground Track box.

The following observatory systems will be affected on November 18, 2021:

17:36:24Z – 19:52:52Z CERES in Contam-Safe mode, science data will not be available

17:46:24Z – 18:28:54Z OMPS in Decon mode, Science data will not be available

17:51:22Z – 18:29:53Z HRD will be off, data for direct broadcast users will be unavailable.

17:56:24Z – 18:06:24Z Slew maneuver to -91.3 deg Yaw
18:13:52Z – 18:24:52Z Slew back to Nadir Attitude - collected data during that time period may be impacted and not disseminated.

Contact Information: For information on the status of this work, please contact SPSD.Userservices@noaa.gov and ESPC Operations at ESPCOperations@noaa.gov or 301-817-3880

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

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