# NTSB CHI87IA188: Boeing 727-233, Chicago, IL, August 8, 1987

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: August 8, 1987, 14:25 local (19:25 UTC)
- Place: Chicago, IL
- Location: 41.8500° N, 87.6501° W: Placed by OpenAirDocs: center of Chicago, IL, within about 9 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=41.8500&lon=-87.6501&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 135 uninjured
- Status: Completed, report July 10, 1989
- Report: Approved by Office Director
- NTSB case key (mKey): 13672
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI87IA188
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/13672/pdf
- Page: https://openairdocs.org/ntsb/CHI87IA188

## Sequence of events

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

- Near collision between aircraft, climb - to cruise
  - atc clearance - improper, atc personnel(dep/apch) (cause)
  - crew/group coordination - inadequate, atc personnel(dep/apch) (cause)
  - facility,inadequate manuals/directives, faa(other/organization) (contributing factor)
- Near collision between aircraft, climb - to cruise
  - atc clearance - improper, atc personnel(dep/apch) (cause)
  - crew/group coordination - inadequate, atc personnel(dep/apch) (cause)
  - facility,inadequate manuals/directives, faa(other/organization) (contributing factor)

## Analysis (aircraft 2)

AIR CANADA FLT 839 (BOEING 727, C-GYNE) WAS DEPG CHICAGO O'HARE INTL ARPT AS CESSNA 650 (CITATION), N20AT, WAS DEPG PALWAUKEE (PWK) ARPT, ABOUT 8 MI NORTH OF O'HARE. BOTH FLTS TKOF WITH IFR FLT PLANS. BFR THE CITATION TKOF, THE PWK TWR CTLR CTCD THE TRACON NORTH SATELLITE CTLR (NC) & OBTAINED CLNC FOR THE CITATION TO TAKEOFF ON RWY 16 WITH A PWK #1 DEPARTURE. FLT 839 TOOK OFF FM RWY 32R AT O'HARE & BGN A RGT TURN TO 020 DEG, CLBG TO 5000'. AT ABOUT THE SAME TIME, THE CITATION DEPD RWY 16 AT PWK & BGN A RGT TURN WHILE CLBG TO 3000'. THE 2 ACFT CONVERGED NRLY HEAD-ON & PASSED CLOSE TO EACH OTR. FLT 839 ESTD THEY PASSED WITH APRX 500' SEPN, THE CITATION CREW ESTD 100' SEPN. BOTH FLTS WERE IN CTC WITH TRACON; FLT 839 WAS IN CTC WITH THE EAST DEP CTLR (EC); THE CITATION CREW WERE IN CTC WITH NC. THE 2 CTLRS WERE WORKING SIDE-BY-SIDE, SHARING THE SAME RADAR SCOPE. THERE WAS AN AVAILABLE LIGHT TO WARN OF ACFT DEPG PWK, BUT IT WAS NOT BEING USED. WRITTEN PROCEDURES FOR USE OF THE LIGHT WERE NOT SPECIFIC. TRAFFIC WAS DESCRIBED AS MODERATE TO BUSY.

## Aircraft 1

- Registration: CGYNE (not matched to a registry record)
- Reported make and model: BOEING 727-233
- Category: Airplane
- Serial number: 22345
- Engines: P&W JT8D-15 15500 lbs thrust turbo fan
- Damage: No damage
- Flight: Part 129
- Registered owner: Air Canada
- Airworthiness certificate: Standard, Transport
- Departed: ORD, CHICAGO, IL
- Destination: CYYC, CALGARY,CANADA, OF
- Flight plan: IFR
- Airport: PWK, Palwaukee

## Aircraft 2

- Registration: N20AT (not matched to a registry record)
- Reported make and model: CESSNA 650
- Category: Airplane
- Serial number: 109
- Engines: AIRESEARCH TFE-731 3650 lbs thrust turbo fan
- Damage: No damage
- Flight: Executive/Corporate, Part 91
- Registered owner: Quaker Oats Company
- Airworthiness certificate: Standard, Normal
- Departed: PWK, WHEELING, IL
- Destination: SBN, SOUTH BEND, IN
- Flight plan: IFR
- Airport: PWK, Palwaukee

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot, aircraft 1; foreign; airplane ratings: multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: left; flight hours: 7,005 total, 4,766 in this make and model, 5 in the last 24 hours
- Pilot, aircraft N20AT; age 37; airline transport; airplane ratings: multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: left; flight hours: 6,100 total, 100 in the last 90 days

## Weather

- Conditions: Instrument (IMC), Day
- Visibility: 1 statute miles
- Lowest ceiling: 3,300 ft overcast
- Observed at: ORD, 6 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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