Commuter aircraft encounters wake turbulence while executing arrival into atl.

Attributes
ACN	909149
Time
Date	201009
Local Time Of Day	0601-1200
Place
Locale Reference	A80.TRACON
State Reference	GA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Regional Jet CL65 Undifferentiated or Other Model
Flight Phase	Descent
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 260 Flight Crew Total 22000 Flight Crew Type 11000
Person 2
Function	First Officer Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 190 Flight Crew Total 8500 Flight Crew Type 5000
Events
Anomaly	Inflight Event / Encounter Wake Vortex Encounter

Narrative:

Upon arrival into atl; crew was proceeding along a star using the ppas profile descent angle and airspeed; at flight idle thrust; and on profile to cross erlin at 14000 as cleared by ATC. Prior to crossing erlin; ATC assigned speed 300 knots; which required acceleration of about 30 knots and an increase in the descent rate. Crew complied with the new speed clearance and descent profile to comply with the clearance to cross erlin at 14000; and aircraft was established on speed and descent profile at approximately 16000 in smooth air. At 15000; aircraft simultaneously entered a sudden left roll estimated to be over 30 degrees bank;and a minor downward pitch and the autopilot disconnected. I assumed control using the yoke and adjusted pitch and bank to straight and level and in transition did encounter another less severe pitch and bank change; and then climbed about 200 feet back into smooth air and did advise ATC of the severe wake and that we were unable to descend at this time. ATC cancelled our crossing restriction; and vectored us off course away from the area of turbulence. From that point flight proceeded without further incident. Shortly after the wake encounter; ATC did point out; and we did see a large airplane ahead; but at a distance that would have appeared to pose little to no chance of threat of wake turbulence.

Original NASA ASRS Text

Title: Commuter aircraft encounters wake turbulence while executing arrival into ATL.

Narrative: Upon arrival into ATL; crew was proceeding along a star using the PPAS profile descent angle and airspeed; at flight idle thrust; and on profile to cross ERLIN at 14000 as cleared by ATC. Prior to crossing ERLIN; ATC assigned speed 300 knots; which required acceleration of about 30 knots and an increase in the descent rate. Crew complied with the new speed clearance and descent profile to comply with the clearance to cross ERLIN at 14000; and aircraft was established on speed and descent profile at approximately 16000 in smooth air. At 15000; aircraft simultaneously entered a sudden left roll estimated to be over 30 degrees bank;and a minor downward pitch and the autopilot disconnected. I assumed control using the yoke and adjusted pitch and bank to straight and level and in transition did encounter another less severe pitch and bank change; and then climbed about 200 feet back into smooth air and did advise ATC of the severe wake and that we were unable to descend at this time. ATC cancelled our crossing restriction; and vectored us off course away from the area of turbulence. From that point flight proceeded without further incident. Shortly after the wake encounter; ATC did point out; and we did see a large airplane ahead; but at a distance that would have appeared to pose little to no chance of threat of wake turbulence.

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.