So if the aluminum shaft needs to be replaced with steel to prevent propellor separation, shouldn't there be an AD for it and non complying gliders should be grounded, especially since apparently it already killed at least one pilot?
I am curious if the NTSB report even mentioned if it was aluminum or steel shaft. Based on the quality of NTSB reports I have seen I wouldn't be surprised if the investigator wasn't even aware of this issue.

Ramy