Grumman G-164B and Cessna T188C mid-air collision near Warren, Minnesota, June 20, 1984
On June 20, 1984 at about 4:14 pm local time, 2 aircraft, Grumman G-164B (N6533K) and Cessna T188C (N9367K), were involved in a mid-air collision near Warren, Minnesota. 2 people were killed. The weather was visual conditions (good weather).
The NTSB's probable cause their words, unchanged
The NTSB has not yet published a probable cause for this accident. Investigations usually take one to two years; this page updates when the final report is released.
Source: NTSB aviation accident database, copy made October 5, 2026. Docket and reports at the NTSB.
What the record shows
- Date
- June 20, 1984 · about 4:14 pm local time
- Place
- Warren, Minnesota · map
- Type
- Accident · mid-air collision
- Injuries
- 2 people were killed.
- Weather
- visual conditions (good weather)
- Aircraft 1
- Grumman G-164B · all G-164Bs on the register
- Registration
- N6533K · no longer on the register · serial 358B
- Damage
- Destroyed
- Flight
- Aerial application (crop spraying) flight · agricultural flying rules (Part 137)
- Aircraft 2
- Cessna T188C · all T188Cs on the register
- Registration
- N9367K · no longer on the register · serial T1880398T
- Damage
- Destroyed
- Flight
- Aerial application (crop spraying) flight · agricultural flying rules (Part 137)
The NTSB's narrative for the Grumman G-164B final · quoted from the NTSB record
N9367K WAS ON DEPARTURE AND CLIMBOUT TO AERIAL APPLICATION OPERATIONS. N6533K WAS ABOUT TO ENTER THE TRAFFIC PATTERN TO LAND AND RELOAD. MARKS ON RESPECTIVE AIRFRAMES INDICATE N9367K WAS ABOVE AND APPROACHING N6533K FROM THE LATTER'S FORWARD LEFT QUARTER; N6533K WAS BELOW AND APPROACHING N9367K FROM THE LATTER'S FORWARD RIGHT QUARTER, WHEN THECOLLISION OCCURRED. WITNESSES NOTED NO EVASIVE ACTION BY EITHER AIRCRAFT. COLLISION OCCURRED ABOUT 500 FT AGL, 1 AND 1/2MILES FROM AIRPORT. BOTH ACFT SUSTAINED STRUCTURAL DAMAGE AND DESCENDED TO GROUND IMPACT IN UNCONTROLLED FLIGHT.
The complete narrative as the NTSB published it. The NTSB's docket holds the report as a PDF and any photographs, statements and other documents from the investigation.
The NTSB's narrative for the Cessna T188C final · quoted from the NTSB record
N9367K WAS ON DEPARTURE AND CLIMBOUT TO AERIAL APPLICATION OPERATIONS. N6533K WAS ABOUT TO ENTER THE TRAFFIC PATTERN TO LAND AND RELOAD. MARKS ON RESPECTIVE AIRFRAMES INDICATE N9367K WAS ABOVE AND APPROACHING N6533K FROM THE LATTER'S FORWARD LEFT QUARTER; N6533K WAS BELOW AND APPROACHING N9367K FROM THE LATTER'S FORWARD RIGHT QUARTER WHEN THE COLLISION OCCURRED. WITNESSES NOTED NO EVASIVE ACTION BY EITHER AIRCRAFT. COLLISION OCCURRED ABOUT 500 FT AGL, 1 AND 1/2 MI FROM AIRPORT. BOTH ACFT SUSTAINED STRUCTURAL DAMAGE AND DESCENDED TO GROUND IMPACT IN UNCONTROLLED FLIGHT.
The complete narrative as the NTSB published it. The NTSB's docket holds the report as a PDF and any photographs, statements and other documents from the investigation.
The factual record for the Grumman G-164B from the NTSB's investigation tables, in plain English
Pilot
- Certificate: airline transport pilot
- Ratings: multi-engine land; single-engine land; single-engine sea; instrument: airplane
- Flight time: 8,427 hours in all; 50 in the last 90 days; 20 in the last 30 days
- Medical certificate: Class 2 (valid medical--w/ waivers/lim.)
- Seat: ctr
The aircraft
- Last inspection: annual inspection, April 28, 1984
- Maximum gross weight: 6,075 lb
- Seats: 1
- Landing gear: fixed
- Engine: P&W R1340-ANI (piston); 0 hours total
- Fire on the ground
The flight
- Departed from: D37 Warren MN at 3:40 pm
- Flight plan: none
- Runway 0
Weather at the time
- Light: daylight
- Wind: from 180° at 10 knots
- Visibility: 10 statute miles
- Sky: clear
- Temperature: 0°F (-18°C), dew point 0°F (-18°C)
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 1 |
The factual record for the Cessna T188C from the NTSB's investigation tables, in plain English
Pilot
- Certificate: airline transport pilot
- Ratings: multi-engine land; single-engine land; single-engine sea; instrument: airplane; rotorcraft: balloon
- Flight time: 29,700 hours in all; 250 in the last 90 days; 125 in the last 30 days
- Medical certificate: Class 1 (valid medical--w/ waivers/lim.)
- Seat: ctr
The aircraft
- Last inspection: annual inspection, November 9, 1983
- Maximum gross weight: 2,500 lb
- Seats: 1
- Landing gear: fixed
- Engine: Continental TSIO-520-T (piston); 0 hours total
- Operator: Pulkrabek Airspray,Inc.
The flight
- Departed from: D37 Warren MN at 4:09 pm
- Flight plan: none
- Runway 0
Injuries
| Fatal | Serious | Minor | None | |
|---|---|---|---|---|
| Crew | 1 |
Documents from the investigation the NTSB's docket: the evidence folder behind the report
The docket, the folder of records gathered during an investigation (maintenance records, photographs, witness statements, examinations), has not been read from the NTSB for this case yet; the list appears here once it has. Open the docket at the NTSB.
Everything on this page comes from the NTSB's public records. The narrative, probable cause and findings are the NTSB's own words; the coded tables behind the report are written out in plain English, with pilots' ages, home towns and medical details left out. The documents and photographs are the NTSB's docket, shown as the NTSB released them. This site's own text never names anyone involved. A preliminary report can change; the final report usually follows one to two years later, and the page is refreshed when it does.