Chassis malfunction turns Moscow-Yerevan flight back

The Boeing 737, making a flight from Moscow to Yerevan,
turned around mid-flight and landed back at Sheremetyevo on account of a
chassis malfunction. As Ria Novosti writes, the Ministry of the Russian Federation
for Civil Defense, Emergency Situations and Elimination of Consequences of
Natural Disasters reported this. 

The reason why the plane turned back was the chassis sensor
failure.