PA-23 Apache/Geronimo Apache
Flight Crew Multiengine; Flight Crew Commercial; Flight Crew Instrument
Flight Crew Last 90 Days 150; Flight Crew Total 500; Flight Crew Type 70
Aircraft Equipment Problem Critical
Flight Crew Returned To Departure Airport; General Maintenance Action; General Declared Emergency
Aircraft
As I was climbing to my cruise altitude I started to notice my left engine running rough. I checked all of the engine instruments and noticed that cylinder #1 was indicating an EGT that was 600 degrees less than the others. I asked to return to my point of departure to have maintenance performed of the aircraft. ATC treated it as an emergency and I landed without incident.
A PA-23 pilot returned to his departure airport when the left engine started to run rough and one cylinder EGT indicated 600 degrees lower than the others.