This Could Be A Pricey One, Folks...
The FAA has submitted a Notice of Proposed Rulemaking on a
potential Airworthiness Directive aimed at McCauley Propellers,
specifically model 3A32C406/82NDB-X and D3A32C409/82NDB-X
Propellers (hereafter referred to as C406 and C409, respectively)
mounted to Teledyne Continental Motors (TCM) IO-520, TSIO-520, or
IO-550 reciprocating engines.