AWB 63-002 Bell 206 Freewheel Unit Failures [pdf](casa.gov.au)
casa.gov.au
AWB 63-002 Bell 206 Freewheel Unit Failures [pdf]
https://www.casa.gov.au/sites/default/files/2021-09/airworthiness-bulletin-63-002-bell-206-freewheel-unit-failures-mast-yielding-main-rotor-separation.pdf
Contrary to some aviation experts on YT, mast bumping and catastrophic mast separation in the 206 is possible with debris in the oil restrictor to the freewheeling unit.
0. https://www.tsb.gc.ca/eng/rapports-reports/aviation/2011/a11...
In relation to the https://asn.flightsafety.org/wikibase/268724
and
https://asn.flightsafety.org/wikibase/495847