Small aircraft on IFR flight plan has rough engine, declares mayday.

Attributes
ACN	226897
Time
Date	199211
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : tmb
State Reference	MI
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mia
Operator	general aviation : personal
Make Model Name	Small Aircraft
Flight Phase	cruise other
Route In Use	enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 300 flight time total : 10000 flight time type : 300
ASRS Report	226897
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : declared emergency
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

I was IFR in miami when my engine started running rough, declared a mayday with miami. They vectored me to tmb.

Original NASA ASRS Text

Title: SMA ON IFR FLT PLAN HAS ROUGH ENG, DECLARES MAYDAY.

Narrative: I WAS IFR IN MIAMI WHEN MY ENG STARTED RUNNING ROUGH, DECLARED A MAYDAY WITH MIAMI. THEY VECTORED ME TO TMB.

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.