Question: Why didn't the pilots of the other Q400 incidents feather their #2 props as well? Seems to me that could have prevented the injuries that resulted from the prop fragment intrusion into the cabin.
In connection with the first incident in Aalborg, the captain in a press interview stated "he believed with 90% certainty the fault was an indication fault only". Evidently his experience of the "christmas tree" reputation of the Q400 (i.e. lots of more or less unfounded alarm indications) led him to believe the landing gear was most probably okay. Despite this he ordered passengers away from the rows adjacent to the propeller, in the event probably saving them from more serious injuries.
As regards the second incident in Vilnius, details are more scarce but I seem to recall the RH prop was actually feathered in that landing.