Wake turbulence encounter on final approach.

Attributes
ACN	303428
Time
Date	199504
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : atl
State Reference	GA
Altitude	msl bound lower : 2156 msl bound upper : 2156
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : atl tracon : ric
Operator	common carrier : air carrier
Make Model Name	Brasilia EMB-120 All Series
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 300 flight time total : 3400 flight time type : 1700
ASRS Report	303428
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	inflight encounter other other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control flight crew : returned to intended course or assigned course
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

Atlanta approach using radar vectors to sequence arrs, then issuing clearance for visual approach behind traffic. Flight was vectored from base to final and placed approximately 2 mi behind MD80 just outside OM on runway 8L. Assigned speed of 160 KTS to catta/OM. Appeared to be closing on MD80, began slowing. Initial flaps set 15 degrees, gear lowered and propellers set to 100 percent. Second flap setting to 25 degrees, aircraft slowed to 132 KTS and 1 DOT above ILS GS. Suspect wake turbulence from arriving MD80, EMB120 rolled right with 1.15 G vertical acceleration. Full left aileron brought back to wings level. Flight data download indicated roll attitude of 05 degrees. Approach continued without incident. Callback conversation with reporter revealed the following: this callback is a result of wake turbulence callback questionnaire. Reporter did not have a very severe encounter with wake nor did it last very long. His main concern was that the flight crew felt they had planned well to avoid the wake. They were flying high and still encountered it. His main suggestion is to find a way to keep the high flying fast traffic from descending through the smaller aircraft flight path. That is what he feels would solve most of the wake problems.

Original NASA ASRS Text

Title: WAKE TURB ENCOUNTER ON FINAL APCH.

Narrative: ATLANTA APCH USING RADAR VECTORS TO SEQUENCE ARRS, THEN ISSUING CLRNC FOR VISUAL APCH BEHIND TFC. FLT WAS VECTORED FROM BASE TO FINAL AND PLACED APPROX 2 MI BEHIND MD80 JUST OUTSIDE OM ON RWY 8L. ASSIGNED SPD OF 160 KTS TO CATTA/OM. APPEARED TO BE CLOSING ON MD80, BEGAN SLOWING. INITIAL FLAPS SET 15 DEGS, GEAR LOWERED AND PROPS SET TO 100 PERCENT. SECOND FLAP SETTING TO 25 DEGS, ACFT SLOWED TO 132 KTS AND 1 DOT ABOVE ILS GS. SUSPECT WAKE TURB FROM ARRIVING MD80, EMB120 ROLLED RIGHT WITH 1.15 G VERT ACCELERATION. FULL L AILERON BROUGHT BACK TO WINGS LEVEL. FLT DATA DOWNLOAD INDICATED ROLL ATTITUDE OF 05 DEGS. APCH CONTINUED WITHOUT INCIDENT. CALLBACK CONVERSATION WITH REPORTER REVEALED THE FOLLOWING: THIS CALLBACK IS A RESULT OF WAKE TURB CALLBACK QUESTIONNAIRE. RPTR DID NOT HAVE A VERY SEVERE ENCOUNTER WITH WAKE NOR DID IT LAST VERY LONG. HIS MAIN CONCERN WAS THAT THE FLC FELT THEY HAD PLANNED WELL TO AVOID THE WAKE. THEY WERE FLYING HIGH AND STILL ENCOUNTERED IT. HIS MAIN SUGGESTION IS TO FIND A WAY TO KEEP THE HIGH FLYING FAST TFC FROM DSNDING THROUGH THE SMALLER ACFT FLT PATH. THAT IS WHAT HE FEELS WOULD SOLVE MOST OF THE WAKE PROBS.

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.