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  • FAA via The Black Vault· 2014· 179 pages· 4 pages mention it
    • p. 173 …titled, "Investigation of Unusual In‐flight Vibrations of Robinson R44 II Helicopters 2013‐007579 Hansen Self 9/19/2013 the…
    • p. 178 …to Robinson Helicopter Company regarding any abnormal vibration from R44 Helicopter 2013‐007828 Tate McClatchy Newspapers 9/30/2013 copy…