# NTSB MIA88IA167: Beech 200, N981LL, Chicago, IL, May 10, 1988

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: May 10, 1988, 16:55 local (21:55 UTC)
- Place: Chicago, IL
- Coordinates: 41.869743, -87.649902 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=41.8697&lon=-87.6499&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 95 uninjured
- Status: Completed, report July 18, 1990
- Report: Approved by Office Director
- NTSB case key (mKey): 32058
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MIA88IA167
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/32058/pdf
- Page: https://openairdocs.org/ntsb/MIA88IA167

## Sequence of events

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

- Near collision between aircraft, approach
  - communications - improper, atc personnel(dep/apch) (cause)
  - instructions,written/verbal - not understood, atc personnel(lcl/gnd/clnc) (cause)
  - radar separation - inadequate (cause)
- Near collision between aircraft, cruise - normal
  - communications - improper, atc personnel(dep/apch) (cause)
  - instructions,written/verbal - not understood, atc personnel(lcl/gnd/clnc) (cause)
  - radar separation - inadequate (cause)

## Analysis (aircraft 2)

MIDWAY FLT 172 (MCDONNELL DOUGLAS DC-9, N1065T) WAS ON AN IFR DEPARTURE FROM CHICAGO MIDWAY ARPT AT THE SAME TIME THAT BEECH 200, N981LL, WAS ON AN IFR ARRIVAL FOR A VISUAL APCH TO MERRILL C MEIGS ARPT, ALTHOUGH BOTH WERE IN VMC. PREVIOUSLY, O'HARE TRACON HAD RESTRICTED EASTERLY DEPARTURES FROM MIDWAY TO NOT LESS THAN 20 MI IN-TRAIL. SUBSEQUENTLY, THE HANDOFF CONTROLLER (CTLR) AT TRACON INSTRUCTED THE CTLRS AT MIDWAY TOWER TO 'CANCEL THE RESTRICTION,'  MEANING TO CANCEL THE IN-TRAIL RESTRICTION. HOWEVER, THE CTLRS AT MIDWAY THOUGHT THIS WAS IN REFERENCE TO A CLIMB RESTRICTION ON THE CANAL THREE SID WHICH FLT 172 WAS USING. SUBSEQUENTLY, FLT 172 & N981LL CONVERGED AS FLT 172 WAS CLIMBING TO 3000 FT & N981LL WAS DSCNDG TO 2000 FT. RADAR DATA SHOWED THE ACFT PASSED EACH OTHER WITH LESS THAN THE REQUIRED VERTICAL & HORIZONTAL SEPN.

## Aircraft 1

- Registration: N981LL (not matched to a registry record)
- Reported make and model: BEECH 200
- Category: Airplane
- Serial number: BB602
- Engines: P&W PT6A-41 850 horsepower turbo prop
- Damage: No damage
- Flight: Public aircraft, Part 91
- Operator: State Of Illinois
- Registered owner: State Of Illinois
- Airworthiness certificate: Standard, Normal
- Departed: SPI, SPRINGFIELD, IL
- Destination: MEI, CHICAGO, IL
- Flight plan: IFR
- Airport: MDW, Chicago Midway

## Aircraft 2

- Registration: [N1065T](https://openairdocs.org/deregistered/N1065T-1996-12-17), registration cancelled 1996-12-17, S/N 45779 (OpenAirDocs)
- Reported make and model: MCDONNELL DOUGLAS DC-9
- Registry model: [Douglas DC9-15](https://openairdocs.org/model/douglas-dc9-15) (registry code 3022036) (OpenAirDocs)
- Category: Airplane
- Serial number: 45779
- Engines: P&W JT8D 14500 lbs thrust turbo fan
- Damage: No damage
- Flight: Part 121
- Operator: Midway Airlines
- Registered owner: First Bank Of Utah
- Airworthiness certificate: Standard, Transport
- Departed: MDW, CHICAGO, IL
- Destination: PHC, PHILADELPHIA, PA
- Flight plan: IFR
- Airport: MDW, Chicago Midway, runway 31L, 6,519 × 150 ft, concrete

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot, aircraft N981LL; age 55; airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: helicopter, airplane; medical: class 1, valid medical--no waivers/lim.; seat: left; flight hours: 14,431 total
- Pilot, aircraft N1065T; age 45; flight engineer, airline transport; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: left; flight hours: 15,000 total, 7,173 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Wind: 40° at 8 knots
- Visibility: 15 statute miles
- Lowest ceiling: 4,000 ft broken
- Temperature: 59 °F, dew point 50 °F
- Altimeter: 29.00 inHg
- Observed at: ORD, 11 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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