Cessna Twin Piston Undifferentiated or Other Model
Flight Crew Last 90 Days 15; Flight Crew Total 1900; Flight Crew Type 1350
Aircraft Equipment Problem Critical
Flight Crew Returned To Departure Airport; General Declared Emergency
Aircraft
Shortly after departure I noticed a rough running left engine. No indications of malfunctions from flight instruments or controls. As a precaution; I requested a return to my departure airport; and mentioned possible problem with left engine. Approach asked if an emergency would be declared; and I did; in fact; declare an emergency. I was vectored back towards and handed off to the Tower and landed without incident.
When the left engine started to run rough; the pilot of a Cessna twin declared an emergency and returned to his departure airport.