Chicago – DuPage

On March 5, 1986 at 05:06 PM, Chicago – DuPage experienced a crash involving Mitsubishi MU-2 Marquise, operated by Air Hi Ho, with the event recorded near Eola Illinois.

The flight was categorized as executive/corporate/business and the reported phase was flight at a plain, valley crash site.

5 people were known to be on board, 5 fatalities were recorded, 0 survivors were identified or estimated. This corresponds to an estimated fatality rate of 100.0%.

Crew on board: 2, crew fatalities: 2, passengers on board: 3, passenger fatalities: 3, other fatalities: 0.

The listed crash cause is human factor. Evidence shows copilot called, 'mayday, uncontrolled spin' after aIRCRAFT radar track showed decelERATION from 180 to 120 kNOts over 2 minUTES period while maintaining constant 4,000 feet cruise altitude. Constant altitude consistent with autopilot/autotrim use, particularly in view of reported turbulence/icing. Elevator trim found at approx 13° nose up. No evidence found of preimpact failure or malfunction in aircraft powerplants, structure or systems. Evidence suggests scenario of crew inattention after power reduction with autopilot altitude setting. On power application, aircraft pitched up from slow speed into uncontrolled flight. Duty day at time of mishap approaching 11 hours. All five occupants were killed.

Aircraft reference details include registration N513DC, MSN 321, year of manufacture 1975.

Geospatial coordinates for this crash are approximately 41.7775°, -88.2428°.