# NTSB CHI91LA095: Beech G35, N4596D, Teedsburg, WI, February 10, 1991

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Limited investigation · Final report
- Date: February 10, 1991, 12:00 local (18:00 UTC)
- Place: Teedsburg, WI
- Coordinates: 43.53057, -89.989707 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=43.5306&lon=-89.9897&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: Serious injuries
- Injuries: 2 serious, 2 minor
- Status: Completed, report April 8, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 15010
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI91LA095
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/15010/pdf
- Page: https://openairdocs.org/ntsb/CHI91LA095

## Probable cause

FAILURE OF THE PILOT TO OBTAIN OR MAINTAIN ADEQUATE AIRSPEED FOR A GO-AROUND (ABORTED LANDING), WHICH RESULTED IN AN INADVERTENT STALL/MUSH.  THE FAILURE TO ATTAIN PROPER RUNWAY ALIGNMENT FOR LANDING WAS A RELATED FACTOR.

## Sequence of events

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

- Loss of control - in flight, landing - aborted
  - proper alignment - not attained, pilot in command (contributing factor)
  - go-around - initiated, pilot in command
  - airspeed - inadequate, pilot in command (cause)
  - stall/mush - inadvertent, pilot in command (cause)
- In flight collision with terrain/water, landing - aborted

## Analysis

THE PILOT SAID THAT WHILE ATTEMPTING TO LAND, HE WAS HAVING TROUBLE MAINTAINING DIRECTIONAL CONTROL. HE SAID THAT HE ATTEMPTED TO GO-AROUND, BUT LOST DIRECTIONAL CONTROL. THE AIRCRAFT VEERED OFF THE RIGHT SIDE OF THE RUNWAY AND CAME TO REST 180 DEGREES FROM ITS ORIGINAL HEADING. POST-ACCIDENT INVESTIGATION REVEALED NO AIRFRAME OR POWERPLANT ABNORMALITIES.

## Aircraft

- Registration: [N4596D](https://openairdocs.org/deregistered/N4596D-1999-06-24), registration cancelled 1999-06-24, S/N D-4765 (OpenAirDocs)
- Reported make and model: BEECH G35
- Registry model: [Beech G35](https://openairdocs.org/model/beech-g35) (registry code 1151516) (OpenAirDocs)
- Category: Airplane
- Serial number: D-4765
- Engines: CONTINENTAL E-225-8 225 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Robert Knutson Jr.
- Departed: FLD, FOND DU LAC, WI
- Airport: C35, Reedsburg, runway 36, 4,990 × 75 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 36; private; airplane ratings: single-engine land; medical: class 3, valid medical--no waivers/lim.; flight hours: 254 total, 147 in this make and model, 225 as pilot in command, 30 in the last 90 days, 8 in the last 30 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 290° at 12 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: -0 °F, dew point -0 °F
- Observed at: LNR, 20 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 19910210001859A](https://openairdocs.org/incident/19910210001859A), Feb 10, 1991: Beech G35, Reedsburg, WI, Substantial damage. Lost control landing in a crosswind began go around and dirifted into trees.

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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