# NTSB MKC86FCQ01: Kuhn Sonerai II, N23BK, Sedgwick, KS, February 2, 1986

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Final report
- Date: February 2, 1986, 12:15 local (18:15 UTC)
- Place: Sedgwick, KS
- Coordinates: 37.910453, -97.41909 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=37.9105&lon=-97.4191&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious, 1 minor
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 34090
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC86FCQ01
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/34090/pdf
- Page: https://openairdocs.org/ntsb/MKC86FCQ01

## Sequence of events

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

- Airframe/component/system failure/malfunction, cruise
  - lubricating system,oil line - loose (cause)
  - fluid,oil - leak
  - precautionary landing - performed, pilot in command (contributing factor)
  - unsuitable terrain or takeoff/landing/taxi area - selected, pilot in command (cause)
- On ground/water collision with object, landing - roll
  - terrain condition - crop (contributing factor)
  - object - fence (contributing factor)
- Nose gear collapsed, landing - roll
  - landing gear,nose gear - overload
- Nose over, landing - roll

## Analysis

THE PLT NOTICED ENG OIL ON THE COCKPIT CANOPY DURING THE LOCAL FLT AND DECIDED TO MAKE A PRECAUTIONARY LANDING. THE LANDING WAS MADE IN A WHEAT FIELD WHERE THE ACFT CONTACTED A FENCE. THE NOSE GEAR THEN COLLAPSED AND THE ACFT NOSED OVER. POST ACCIDENT INSPECTION OF THE ENG DISCLOSED AN OIL LEAK AT THE OIL RADIATOR HOSE CONNECTION ON TOP OF THE ENG. POST ACCIDENT INSPECTION REVEALED THE ENG STILL CONTAINED THE REQUIRED AMOUNT OF OIL. NO OTHER DISCREPANCIES WERE NOTED.

## Aircraft

- Registration: [N23BK](https://openairdocs.org/deregistered/N23BK-2014-12-17), registration cancelled 2014-12-17, S/N 1064, built 1984 (OpenAirDocs)
- Reported make and model: KUHN SONERAI II
- Registry model: [Kuhn Robert M SONERAI 2LT](https://openairdocs.org/model/kuhn-robert-m-sonerai-2lt) (registry code 056594W) (OpenAirDocs)
- Registry engine: [Volkswagen CONVERSION](https://openairdocs.org/engine/volkswagen-conversion) (registry code 63501, reciprocating) (OpenAirDocs)
- Category: Airplane, amateur-built
- Serial number: 1067
- Airframe hours: 125
- Engines: Volkswagen 1834CC 50 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Robert M. Kuhn
- Airworthiness certificate: Special, Experimental (Special)
- Last inspection: Annual, July 11, 1985, 2 hours before
- Departed: EWK, NEWTON, KS

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 54; private; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: rear; flight hours: 332 total, 156 in this make and model, 286 as pilot in command, 36 in the last 90 days, 15 in the last 30 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 79° at 3 knots
- Visibility: 5 statute miles
- Temperature: 54 °F, dew point 45 °F
- Observed at: ICT, 17 nm away

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19860202031249A](https://openairdocs.org/incident/19860202031249A), Feb 2, 1986: Amtrmo SONERAI2, Sedgwick, KS, Substantial damage. Reported rough engine and oil leak. Overshot precautionary landing. Nosed over. Small leak noted in cooler hose.

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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