SF34L encountered the wake vortex of the preceding B747 8 mi ahead.

Attributes
ACN	419156
Time
Date	199811
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : mia airport : mia
State Reference	FL
Altitude	msl bound lower : 7200 msl bound upper : 7200
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : mia
Operator	common carrier : air carrier
Make Model Name	Saab-Scania Undifferentiated or Other Model
Flight Phase	descent other
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B747 Undifferentiated or Other Model
Flight Phase	descent other
Route In Use	arrival other enroute : on vectors
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : approach oversight : supervisor
Qualification	controller : radar
Experience	controller radar : 19 flight time total : 30
ASRS Report	419156
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	inflight encounter other other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control none taken : insufficient time
Consequence	Other
Miss Distance	horizontal : 48000
Supplementary
Air Traffic Incident	other

Narrative:

SF340 was 8 mi behind a B747, both descending on downwind. SF340 encountered wake turbulence and rolled to 75 degrees before recovering.

Original NASA ASRS Text

Title: SF34L ENCOUNTERED THE WAKE VORTEX OF THE PRECEDING B747 8 MI AHEAD.

Narrative: SF340 WAS 8 MI BEHIND A B747, BOTH DSNDING ON DOWNWIND. SF340 ENCOUNTERED WAKE TURB AND ROLLED TO 75 DEGS BEFORE RECOVERING.

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.