An Austrian Airlines Dash8-400, registration OE-LGE performing flight OS142 from Nuremberg to Vienna with 67 passengers and 4 crew, performed a full emergency landing into Vienna, after the crew received an unsafe gear indication on the primary display, though the alternate indication showed a safe gear. The crew elected to go-around and entered a hold for about an hour, talking to maintenance, and finally receiving a safe gear indication on all displays.
In the meantime two rescue helicopters, 16 ambulances and 5 emergency doctors were dispatched to the airport. Fire engines of the airport took positions, and all fire stations around the airport were alerted and put into standby.
Despite the safe gear indication the crew prepared passengers for a crash landing.
The landing in the end was safe.
Press Report in German:
http://noe.orf.at/stories/259275/