There has been an instance of the top mounted oil pickup tube fracturing and falling into the oil tank. Naturally, when this happens oil pressure is lost. Because all tanks were made the same way, and there has already been an update prior, to move the oil pickup to the bottom of the tank in order to increase suction, this now becomes and mandatory change.
No Viking 110 Engines should fly with a top mounted oil pickup hose after 06/05/2018
Contact Viking for suggested pictures/explanation on how to make this change.
Viking 110 - Oil Pickup Hose