Yes it can, and had it happen. The subsequent investigation revealed that when the pilot selected gear down,the landing gear hyd system pressurised down, the gear extended normally but on landing, hyd system fluid was seen flowing down from the front of the flight control deck and over both the windscreens. The deck was awash with 5606. Further investigation revealed a very tight hairline crack in the underside of a pressure pipe that opened up when pressure was applied, the spray from the crack was very fine and not of sufficient flow rate to trip the priority valve until the reservoir was emptied.