Air carrier medium large transport vectored too close behind air carrier large transport encounters jet vortex causing control difficulty. Operational error.

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Attributes
ACN	104915
Time
Date	198902
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : den
State Reference	CO
Altitude	msl bound lower : 1500 msl bound upper : 1500
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : den
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	descent : approach
Route In Use	approach : straight in
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 9000 flight time type : 1000
ASRS Report	104915
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other anomaly other
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error other

Narrative:

While on final approach to runway 26L, controller told us to slow for sep. We encountered wake turbulence from aircraft in front of us which violently rolled us 40 degrees + left and right. I added power and increased speed and altitude so as to maintain control of aircraft. Sep was too close for landing and we executed a go around. Suggestion: information from controller on aircraft type we are following especially large aircraft and this was an large transport, and miles of sep would be extremely helpful.

Original NASA ASRS Text

Title: ACR MLG VECTORED TOO CLOSE BEHIND ACR LGT ENCOUNTERS JET VORTEX CAUSING CONTROL DIFFICULTY. OPERATIONAL ERROR.

Narrative: WHILE ON FINAL APCH TO RWY 26L, CTLR TOLD US TO SLOW FOR SEP. WE ENCOUNTERED WAKE TURB FROM ACFT IN FRONT OF US WHICH VIOLENTLY ROLLED US 40 DEGS + L AND R. I ADDED PWR AND INCREASED SPD AND ALT SO AS TO MAINTAIN CTL OF ACFT. SEP WAS TOO CLOSE FOR LNDG AND WE EXECUTED A GO AROUND. SUGGESTION: INFO FROM CTLR ON ACFT TYPE WE ARE FOLLOWING ESPECIALLY LARGE ACFT AND THIS WAS AN LGT, AND MILES OF SEP WOULD BE EXTREMELY HELPFUL.

Data retrieved from NASA's ASRS site as of August 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.