NTSB Identification: CHI98LA351.
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Scheduled 14 CFR operation of AMERICAN EAGLE, INC. (D.B.A. AMERICAN EAGLE )
Accident occurred Thursday, September 17, 1998 in CHICAGO, IL
Probable Cause Approval Date: 02/11/2000
Aircraft: Aerospatiale ATR-42-300, registration: N233RM
Injuries: 1 Serious,15 Uninjured.
NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.
Flight 146, an ATR-42 was approximately 18 miles from the airport on the ILS 09R approach when it encountered wake turbulence from a Flight 554, a Boeing 737-300, which was vectored onto the approach from the north in front of Flight 146. Radar data showed Flight 554 intercepted the localizer approximately 17.5 miles from the airport while descending from 5,200 feet to 4,800 feet. Flight 146 was at an altitude of about 4,900 feet when the wake turbulence encounter occurred. Separation of the two airplanes when the encounter occurred was approximately 4.8 miles. Vertical acceleration of Flight 146 varied from 2.3679 g's to .5542 g's during the encounter.
The National Transportation Safety Board determines the probable cause(s) of this accident to be: the wake turbulence encountered by Flight 146. Full narrative available
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