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Suomi-NPP Mission On-Orbit Experience with Toroid Ball Bearing Retainers Under Unidirectional and Reversing MotionThe Advanced Technology Microwave Sounder (ATMS) instrument scan system on the Suomi National Polar-orbiting Partnership (SNPP) spacecraft has experienced several randomly occurring increased torque 'events' since its on-orbit activation in November 2011. Based on a review of on-orbit telemetry data and data gathered from scan mechanism bearing life testing on the ground, the conclusion was drawn that some degradation of Teflon toroid ball retainers was occurring in the instrument Scan Drive Mechanism. A life extension program was developed and executed on-orbit with very good results to date. The life extension program consisted of reversing the mechanism for a limited number of consecutive scans every day.
Document ID
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Bruegman, Otto
(National Oceanic and Atmospheric Administration Silver Spring, MD, United States)
Thakore, Kamal
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Loewenthal, Stu
(Lockheed Martin Corp. Sunnyvale, CA, United States)
Cymerman, John
(Aerospace Corp. El Segundo, CA, United States)
Date Acquired
June 30, 2016
Publication Date
May 4, 2016
Publication Information
Publication: 43rd Aerospace Mechanisms Symposium
Subject Category
Mechanical Engineering
Spacecraft Instrumentation And Astrionics
Spacecraft Design, Testing And Performance
Distribution Limits
Public Use Permitted.
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