At some point if it is reasonably suspected that a Tail Rotor Blade did depart the aircraft and cause the accident....there will in all likelihood be an AD issued to inspect the Tail Rotor for certain defects or evidence of a pending failure.
If I owned some 139's I would consider getting a head start on that possibility and undertake a one time fleet-wide inspection as a purely precautionary action.
Not knowing what exactly to look for....just some added emphasis to the existing maintenance actions in place could not hurt.
Just Saying!