Commercial Fixed Wing
Air Traffic Control Fully Certified
Other / Unknown
Aircraft Equipment Problem Critical
Air Traffic Control Issued New Clearance; Flight Crew Diverted
Aircraft; Procedure
Aircraft X was at 35;000 FT on the track out of ZZZZZ [Intersection]. As the aircraft was entering Center's airspace; the aircraft stated that due to aircraft maintenance it was turning around. I confirmed this with the aircraft via phone patch. I then treated the aircraft as an emergency. The aircraft was cleared to descend to 34;500 FT and was told upon reaching 34;500 FT; then cleared right turned direct ZZnZZw; further routing to follow.
En route Controller provided emergency handling to an aircraft experiencing equipment difficulties.