Ten dedicated RWAs were built and utilized in over 75 controlled tests. The key scenarios investigated  were bearing alignment, preload, contamination, and anomalous raceway wear observed during the  bearing run-in process. These initially credible scenarios were completely eliminated by the results of the  testing, with the exception of bearing wear observed during the run-in process. This initiated a series of  controlled tests to determine the variables that could affect the anomalous wear. Test bearings were  lubricated with a controlled amount of free oil supplemented by a charge of grease. With the standard  lubrication process, the bearing inner race wear depth was consistently 0.3 to 0.4 microns, regardless of  how the grease was initially distributed. When identical tests were run with only oil, the bearings showed  an increase in wear depth when marginally lubricated with oil and when completely flooded with oil.  These contradicting results led to a conclusion that the rheological lubricant properties were not affecting  the wear, since the oil is significantly more mobile than any oil/grease mixture and should tend to reduce  any lubricant starvation effects. This quandary led to brainstorming which resulted in the introduction of  electrical discharge as a new branch of the fault tree.   The next significant breakthrough of the RRCA was when a strong correlation was made between RWA  bearing failures/anomalies and space weather, specifically coronal mass ejections from the Sun and the  resulting geomagnetic storms. In addition, there were a number of failures or anomalies on different  spacecraft, which occurred during the same geomagnetic storm. While the correlation is strong on all  reviewed failures and anomalies, the statistical arguments herein only take into account the failures and  anomalies on the FUSE spacecraft, since the author is not at liberty to discuss much of the data that  exists. Failures of all four of the RWAs on FUSE were preceded by dry  friction anomalies, which recovered to normal levels after  operating at high speed (2000 rpm or more) for a period of days  or hours. The date of the initiation of the friction increase was  derived from the trending data. A list of the prominent FUSE  anomalies and failures is presented in Table 1, with the  magnitude and date of the friction increase, and the ranking of  any geomagnetic storm within the 3 days leading up to the  observed friction increase. The torque authority of the motor in  the FUSE RWAs was 40 mN-m. Any friction increase beyond  that value is deemed a failed RWA.  The failure of FUSE RW-X on November 25, 2001 occurred on  the same day that a dry friction increase was observed on RWY, which remained in the elevated friction state until it failed 15  days later. These simultaneous friction increases on two RWAs  occurred during the 20th largest geomagnetic storm since 1994.  Of the 12 prominent friction events observed, 4 occurred shortly  after or during geomagnetic storms ranked in the top 20 of  severity since 1994. The rarity of these events results in a  Probability of Correlation of 99.9998% as computed in  Reference 2, or nearly a 1 in a million chance of occurring  randomly.   Testing in the lab successfully duplicated the changes in friction signatures observed on orbit by simply  applying a modest voltage across RWA bearings, supporting the theory that bearing friction can be  increased by electrical discharge across the bearing. This unexpected result led to a retrospective review  of other unexplained RWA friction anomalies, which are included in this discussion.  Table 1.  FUSE Friction Increase Dates NASA/CP—2018-219887 56