I know of two prop departures on Wasp Jr. - powered Stearmans in the 60s, one during a triple-snap, and the other suspected likewise (no witnesses, however). After each case there was an AD to inspect threads on the crankshaft.
Now I believe there is an AD prohibiting aircraft w/ Wasp Jr. power (and with the heavy H-S prop??) from snap or spin maneuvers. Considering the millions of snaps and spins these fine engines endured during WWII training duty, and for 6+ subsequent decades, I regard such an AD as overkill.
