# NTSB CHI83LU007: Berwin Waspair Tomcat Tour, Oconomowoc, WI, August 10, 1983

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Final report
- Date: August 10, 1983, 08:13 local (13:13 UTC)
- Place: Oconomowoc, WI
- Coordinates: 43.10007, -88.490509 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=43.1001&lon=-88.4905&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 1 serious
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 12365
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI83LU007
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/12365/pdf
- Page: https://openairdocs.org/ntsb/CHI83LU007

## Sequence of events

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

- In flight collision with object, go-around (vfr)
  - object - tree(s) (contributing factor)
  - go-around - misjudged, pilot in command (cause)
  - clearance - inadequate, pilot in command (cause)
  - climb - inadequate, pilot in command (cause)

## Analysis

THE ULTRALIGHT COLLIDED WITH A TREE DURING A GO-AROUND. THE ACFT ENCOUNTERED AN UPDRAFT DURING THE LANDING ATTEMPT AND THE PILOT DECIDED TO GO-AROUND. THE ACFT WAS NOT ABLE TO GAIN ALT FAST ENOUGH TO CLEAR A TREE AT THE END OF THE FIELD. THE PILOT WAS IN CONTACT WITH AN INSTRUCTOR VIA A WALKIE-TALKIE RADIO AT THE TIME OF THE ACCIDENT.

## Aircraft

- Registration: UNREG (not matched to a registry record)
- Reported make and model: BERWIN WASPAIR TOMCAT TOUR (WASPAIR TO)
- Category: Ultralight, amateur-built
- Engines: CUYUNA UII-02 unknown
- Damage: Substantial damage
- Flight: Instructional, Part 103
- Registered owner: Chip Berwin
- Airport: NONE, None

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; airplane ratings: single-engine land; medical: unknown, unknown; seat: center

## Weather

- Conditions: Visual (VMC), Day
- Wind: 170° at 5 knots
- Visibility: 15 statute miles
- Lowest ceiling: 3,500 ft broken
- Temperature: 73 °F
- Altimeter: 30.00 inHg
- Observed at: AUW, 13 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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