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.

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Attributes
ACN	995892
Time
Date	201202
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Make Model Name	PA-23 Apache/Geronimo Apache
Operating Under FAR Part	Part 91
Flight Phase	Climb
Route In Use	Direct
Flight Plan	VFR
Component
Aircraft Component	Engine
Person 1
Function	Single Pilot
Qualification	Flight Crew Multiengine Flight Crew Commercial Flight Crew Instrument
Experience	Flight Crew Last 90 Days 150 Flight Crew Total 500 Flight Crew Type 70
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

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.

Original NASA ASRS Text

Title: 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.

Narrative: 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.

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.