MD88 captain reported a severe wake vortex encounter with a B747 at cvg.

Attributes
ACN	969195
Time
Date	201109
Local Time Of Day	1801-2400
Place
Locale Reference	CVG.Airport
State Reference	KY
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	MD-88
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Route In Use	Visual Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	B747 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Landing
Person 1
Function	Captain Flight Engineer / Second Officer
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Engineer
Experience	Flight Crew Last 90 Days 100 Flight Crew Total 10000 Flight Crew Type 2000
Events
Anomaly	Deviation - Altitude Excursion From Assigned Altitude Inflight Event / Encounter Wake Vortex Encounter

Narrative:

[We] encountered severe wake turbulence after being vectored behind a 747 at night in visual conditions. [It] caused 45 degree roll and loss of 300 ft and gain of 500 ft during encounter and recovery. [It is] bad policy for airport to jeopardize the safety of passenger carriers just to force them to follow heavy aircraft at night due to noise. An md-88 makes nowhere near the noise of four engine jets. Not fun trying to recover from a low altitude wake turbulence encounter at night behind a 747. There are plenty of runways available; i.e. 4; in cvg to do this.

Original NASA ASRS Text

Title: MD88 Captain reported a severe wake vortex encounter with a B747 at CVG.

Narrative: [We] encountered severe wake turbulence after being vectored behind a 747 at night in visual conditions. [It] caused 45 degree roll and loss of 300 FT and gain of 500 FT during encounter and recovery. [It is] bad policy for airport to jeopardize the safety of passenger carriers just to force them to follow heavy aircraft at night due to noise. An MD-88 makes nowhere near the noise of four engine jets. Not fun trying to recover from a low altitude wake turbulence encounter at night behind a 747. There are plenty of runways available; i.e. 4; in CVG to do this.

Data retrieved from NASA's ASRS site as of April 2012 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.