# NTSB CHI89IA144: Dornier DO-228, N263MC, Chicago, IL, July 9, 1989

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: July 9, 1989, 16:05 local (21:05 UTC)
- Place: Chicago, IL
- Coordinates: 41.87973, -87.639709 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=41.8797&lon=-87.6397&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 16 uninjured
- Status: Completed, report August 26, 1992
- Report: Approved by Office Director
- NTSB case key (mKey): 14287
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI89IA144
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/14287/pdf
- Page: https://openairdocs.org/ntsb/CHI89IA144

## Probable cause

POOR LOOKOUT BY THE CREW OF THE DORNIER AND THE BARON.

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Near collision between aircraft, descent
  - visual lookout - inadequate, pilot in command (cause)
  - visual lookout - inadequate, pilot of other aircraft (cause)

## Analysis

A NEAR MIDAIR COLLISION OCCURRED AT 5000 FEET MSL IN UNCONTROLLED AIRSPACE, BUT WITHIN THE 30 MILE VEIL OF O'HARE, WHERE A MODE C TRANSPONDER WAS REQUIRED. SEPARATION WAS ABOUT 200 FEET HORIZONTAL AND 100 FEET VERTICAL. THE CREW OF A COMMUTER MADE A STEEP 45 DEGREE BANK AND A NOSE DOWN MANEUVER OF ABOUT 15 DEGREES TO AVOID THE TWIN ENGINE BEECH BARON. O'HARE APPROACH HAD ISSUED TRAFFIC TO THE MIDWAY COMMUTER.

## Aircraft

- Registration: [N263MC](https://openairdocs.org/aircraft/N263MC), registered now, S/N 8141, built 1987 (OpenAirDocs)
- Reported make and model: DORNIER DO-228
- Registry model: [Dornier DORNIER 228-202](https://openairdocs.org/model/dornier-dornier-228-202) (registry code 2992030) (OpenAirDocs)
- Registry engine: [Alliedsign TPE331-12UHR](https://openairdocs.org/engine/alliedsign-tpe331-12uhr) (registry code 02505, turbo-prop) (OpenAirDocs)
- Category: Airplane
- Engines: GARRETT TPE 331-5 715 horsepower turbo prop
- Damage: No damage
- Flight: Part 135
- Registered owner: Midway Airlines
- Airworthiness certificate: Standard, Transport
- Departed: MSN, MADISON, WI
- Flight plan: IFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: left

## Weather

- Conditions: Visual (VMC), Day
- Wind: 220° at 11 knots
- Visibility: 6 statute miles
- Lowest ceiling: 5,000 ft broken
- Temperature: 95 °F, dew point 72 °F
- Altimeter: 29.00 inHg
- Observed at: DPA, 20 nm away

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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