Piper cub has rough engine. Pilot makes precautionary landing.

Attributes
ACN	302236
Time
Date	199504
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ues
State Reference	WI
Altitude	agl bound lower : 1000 agl bound upper : 1000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : personal
Make Model Name	J3 Cub
Operating Under FAR Part	Part 91
Flight Phase	cruise other landing other
Flight Plan	VFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : private pilot : instrument
Experience	flight time last 90 days : 35 flight time total : 3131 flight time type : 112
ASRS Report	302236
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other

Narrative:

Cruising along in piper cub 1000 ft AGL when engine became rough. Noticed nice grass strip and wind sock below. Made precautionary landing. Tightened loose plug wire. Chatted with lady at nearby house a few mins, then took off and returned to ues safely. Also, may have been carburetor ice as carburetor heat made it a little better. Anyway, glad I made a precautionary landing as engine ran fine a few mins later on runup, takeoff, and trip home. These little continentals are very prone to carburetor icer! I know a guy who put carburetor induction air temperature sensor and gauge on his cub and says he would not fly without it. Good idea.

Original NASA ASRS Text

Title: PIPER CUB HAS ROUGH ENG. PLT MAKES PRECAUTIONARY LNDG.

Narrative: CRUISING ALONG IN PIPER CUB 1000 FT AGL WHEN ENG BECAME ROUGH. NOTICED NICE GRASS STRIP AND WIND SOCK BELOW. MADE PRECAUTIONARY LNDG. TIGHTENED LOOSE PLUG WIRE. CHATTED WITH LADY AT NEARBY HOUSE A FEW MINS, THEN TOOK OFF AND RETURNED TO UES SAFELY. ALSO, MAY HAVE BEEN CARB ICE AS CARB HEAT MADE IT A LITTLE BETTER. ANYWAY, GLAD I MADE A PRECAUTIONARY LNDG AS ENG RAN FINE A FEW MINS LATER ON RUNUP, TKOF, AND TRIP HOME. THESE LITTLE CONTINENTALS ARE VERY PRONE TO CARB ICER! I KNOW A GUY WHO PUT CARB INDUCTION AIR TEMP SENSOR AND GAUGE ON HIS CUB AND SAYS HE WOULD NOT FLY WITHOUT IT. GOOD IDEA.

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.