# NTSB CHI87IA112: Dassault-Breguet 50, N52DC, Cleveland, OH, March 31, 1987

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: March 31, 1987, 15:57 local (20:57 UTC)
- Place: Cleveland, OH
- Coordinates: 41.429378, -81.820411 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=41.4294&lon=-81.8204&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 6 uninjured
- Status: Completed, report July 10, 1989
- Report: Approved by Office Director
- NTSB case key (mKey): 13666
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI87IA112
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/13666/pdf
- Page: https://openairdocs.org/ntsb/CHI87IA112

## Sequence of events

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

- Near collision between aircraft, cruise - normal
  - radar separation - inadequate, atc personnel(artcc) (cause)

## Analysis

AN OPNL ERROR DEVELOPED AS A FALCON 50, N52DC, WAS PROCEEDING SE TOWARD THE DRYER VOR AT FL290 & NORTHWEST FLT 427 WAS PROCEEDING WESTBOUND AT THE SAME ALT TOWARD THE SAME FIX (DRYER VOR). WHEN THE FULL PERFORMANCE LVL (FPL) CONTROLLER (CTLR) SAW THE SITUATION DEVELOPING, HE PROVIDED AVOIDANCE VECTORS TO EACH ACFT. HOWEVER, THEY PASSED EACH OTHER WITH ABOUT 1.5 MI HORIZONTAL SEPN & 800' VERTICAL SEPN. THE WORKLOAD HAD BECOME HEAVY & COMPLEX JUST PRIOR TO THE OCCURRENCE. AS THE TRACKER WAS NOTIFYING THE FPL CTLR OF THE CONFLICT, THE CONFLICT ALERT WAS ACTIVATED.

## Aircraft

- Registration: N52DC (not matched to a registry record)
- Reported make and model: Dassault-Breguet 50
- Category: Airplane
- Serial number: 51
- Engines: AIRESEARCH TFE 731-3-1C 3700 lbs thrust turbo fan
- Damage: No damage
- Flight: Executive/Corporate, Part 91
- Operator: Dow Chemical
- Registered owner: Dow Chemical
- Airworthiness certificate: Standard, Transport
- Departed: MBS, SAGINAW, MI
- Destination: DCA, WASHINGTON, DC
- Flight plan: IFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 47; airline transport, commercial; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 12,200 total

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 10 statute miles
- Lowest ceiling: none

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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