GC1B pilot makes emergency divert landing due to partial engine power loss and smell of smoke.

Attributes
ACN	627203
Time
Date	200408
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : eho.airport
State Reference	NC
Altitude	msl single value : 3500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : clt.tracon
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Retractable Gear
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	VFR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : atp
ASRS Report	627203
Person 2
Affiliation	government : faa
Function	controller : approach
Events
Anomaly	aircraft equipment problem : critical other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : diverted to another airport flight crew : declared emergency flight crew : landed in emergency condition
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

While cruising at 3500 ft, the engine started running rough with the smell of smoke in the cockpit. Approach was contacted and the problem reported. I squawked 7700 on the transponder to establish my exact location. An airport was spotted approximately 3 mi at my 9 O'clock position. I proceeded to the airport and landed without incident. The engine was producing partial power through landing. It was determined that a cylinder had broken and oil was pumping out on the exhaust system.

Original NASA ASRS Text

Title: GC1B PLT MAKES EMER DIVERT LNDG DUE TO PARTIAL ENG PWR LOSS AND SMELL OF SMOKE.

Narrative: WHILE CRUISING AT 3500 FT, THE ENG STARTED RUNNING ROUGH WITH THE SMELL OF SMOKE IN THE COCKPIT. APCH WAS CONTACTED AND THE PROB RPTED. I SQUAWKED 7700 ON THE XPONDER TO ESTABLISH MY EXACT LOCATION. AN ARPT WAS SPOTTED APPROX 3 MI AT MY 9 O'CLOCK POS. I PROCEEDED TO THE ARPT AND LANDED WITHOUT INCIDENT. THE ENG WAS PRODUCING PARTIAL PWR THROUGH LNDG. IT WAS DETERMINED THAT A CYLINDER HAD BROKEN AND OIL WAS PUMPING OUT ON THE EXHAUST SYS.

Data retrieved from NASA's ASRS site as of July 2007 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.