A crj flight crew on approach to atl reported a wake vortex encounter with either the B737-700 they ...

Attributes
ACN	888971
Time
Date	201005
Local Time Of Day	1801-2400
Place
Locale Reference	ATL.Airport
State Reference	GA
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	Regional Jet CL65 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Flight Plan	IFR
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer
Qualification	Flight Crew Commercial
Events
Anomaly	Inflight Event / Encounter Wake Vortex Encounter

Narrative:

While joining the localizer for runway 26R; we experienced an aggressive; uncommanded roll to the left and right; [consistent] with wake turbulence. The autopilot was manually disengaged to execute an upset recovery. Power was applied and a course change made to the northwest along with an increase in climb. ATC was notified of our intent to change course to the north and begin an immediate climb. We were sequenced 4 miles behind a 737-700; although; a 757-200 had passed through our intended course being sequenced for runway 27L. It is unclear at this time which aircraft created the wake we encountered. We were resequenced for landing on runway 26R with no further incident. Atl tracon was contacted upon arrival.

Original NASA ASRS Text

Title: A CRJ Flight Crew on approach to ATL reported a wake vortex encounter with either the B737-700 they were following or a B757-200 which had crossed their path headed for another runway.

Narrative: While joining the localizer for RWY 26R; we experienced an aggressive; uncommanded roll to the left and right; [consistent] with wake turbulence. The autopilot was manually disengaged to execute an upset recovery. Power was applied and a course change made to the NW along with an increase in climb. ATC was notified of our intent to change course to the north and begin an immediate climb. We were sequenced 4 miles behind a 737-700; although; a 757-200 had passed through our intended course being sequenced for RWY 27L. It is unclear at this time which aircraft created the wake we encountered. We were resequenced for landing on RWY 26R with no further incident. ATL Tracon was contacted upon arrival.

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.

A crj flight crew on approach to atl reported a wake vortex encounter with either the B737-700 they were following or a B757-200 which had crossed their path headed for another runway.