Quote from the final report:
Not withstanding the existing recommendations and procedures, it appears that intentional override of the primary flight idle stop on turboprops in flight is not excluded.
The existing design of the Fokker 27 Mk050 does not prevent the selection in flight of the propeller pitch setting below the flight idle regime.
This is in my opinion an important lesson from this accident, and something all pilots of the Fk50 and similar turboprops should review.