Small aircraft has rough engine and is vectored to an alternate airport.

Attributes
ACN	230264
Time
Date	199301
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : isp
State Reference	NY
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : n90 tower : phx
Operator	general aviation : personal
Make Model Name	Small Aircraft, Low Wing, 1 Eng, Fixed Gear
Flight Phase	cruise other
Flight Plan	None
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : instrument pilot : commercial pilot : flight engineer pilot : atp pilot : cfi
Experience	flight time last 90 days : 33 flight time total : 6000 flight time type : 1
ASRS Report	230264
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	controller : provided flight assist other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

After arrival at south shore practice area, while reducing throttle setting, engine began to run rough. Attempted to remedy the situation with application of full carburetor heat. Unable to resolve engine difficulty. Placed throttle and carburetor heat in most desirable setting for situation and contacted ny approach on 121.5 due to frequency congestion and requested permission to enter arsa and land.

Original NASA ASRS Text

Title: SMA HAS ROUGH ENG AND IS VECTORED TO AN ALTERNATE ARPT.

Narrative: AFTER ARR AT S SHORE PRACTICE AREA, WHILE REDUCING THROTTLE SETTING, ENG BEGAN TO RUN ROUGH. ATTEMPTED TO REMEDY THE SIT WITH APPLICATION OF FULL CARB HEAT. UNABLE TO RESOLVE ENG DIFFICULTY. PLACED THROTTLE AND CARB HEAT IN MOST DESIRABLE SETTING FOR SIT AND CONTACTED NY APCH ON 121.5 DUE TO FREQ CONGESTION AND REQUESTED PERMISSION TO ENTER ARSA AND LAND.

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.