EMB140 first officer reports wake vortex encounter with preceding heavy jet during arrival to ord.

Attributes
ACN	866906
Time
Date	200912
Local Time Of Day	1201-1800
Place
Locale Reference	ORD.Airport
State Reference	IL
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Make Model Name	EMB ERJ 140 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Heavy Transport
Flight Phase	Initial Approach
Person 1
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Commercial
Experience	Flight Crew Total 3000
Events
Anomaly	ATC Issue All Types Inflight Event / Encounter Loss Of Aircraft Control Inflight Event / Encounter Wake Vortex Encounter

Narrative:

Encountered wake turbulence from a heavy jet on approach. Autopilot disengaged; captain took manual control. Unstable approach; and unable to make 7000 ft at grabl due to wake turbulence encounter. ATC sequencing was too close.

Original NASA ASRS Text

Title: EMB140 First Officer reports wake vortex encounter with preceding heavy jet during arrival to ORD.

Narrative: Encountered wake turbulence from a heavy jet on approach. Autopilot disengaged; Captain took manual control. Unstable approach; and unable to make 7000 ft at GRABL due to wake turbulence encounter. ATC sequencing was too close.

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.