# NTSB CHI05CA196: Simmons GP-4, N619BS, Oshkosh, WI, July 24, 2005

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Data collection · Final report
- Date: July 24, 2005, 12:00 local (17:00 UTC)
- Place: Oshkosh, WI
- Coordinates: 43.984443, -88.556945
- Nearby events: https://openairdocs.org/map.md?lat=43.9844&lon=-88.5569&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report October 27, 2005
- Report: Approved by Office Director
- Parties: Milwaukee, WI FSDO
- NTSB case key (mKey): 62055
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI05CA196
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/62055/pdf
- Page: https://openairdocs.org/ntsb/CHI05CA196

## Probable cause

The pilot's failure to maintain airspeed sufficient enough to compensate for the gusty crosswind condition and prevent a stall during the landing flare.  A factor associated with the accident was the gusting crosswind condition.

## Sequence of events

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

- Loss of control - in flight, landing - flare/touchdown
  - weather condition - gusts (contributing factor)
  - weather condition - crosswind (contributing factor)
  - compensation for wind conditions - inadequate, pilot in command (cause)
  - airspeed - not maintained, pilot in command (cause)
  - stall/mush - inadvertent, pilot in command
- In flight collision with terrain/water, descent - uncontrolled
  - terrain condition - runway

## Analysis

The airplane collided with the runway following a loss of control while landing.  The accident occurred as the pilot was arriving at EAA AirVenture 2005.  The pilot reported he made a low turn onto final approach, possibly encountered a wind gust, and the airplane stalled.  The pilot reported the winds as being from 270 degrees at 11 knots, gusting to 20 knots.  The winds reported at the airport 7 minutes prior to the accident were from 250 degrees at 11 knots, gusting to 15 knots.

## Factual narrative

On July 24, 2005, at 1200 central daylight time, an amateur built Simmons GP-4, N619BS, collided with the runway following a loss of control while landing on runway 18 (8,002 feet by 150 feet, asphalt), at Wittman Field (OSH), Oshkosh, Wisconsin.  The pilot and passenger were not injured.  The airplane was substantially damaged.  The 14 Code of Federal Regulations Part 91 personal flight was operating in visual meteorological conditions without a flight plan.  The last leg of the cross country flight originated from Dayton, Ohio, at 1100 eastern daylight time.

The accident occurred as the pilot was arriving at EAA AirVenture 2005.  The pilot reported he made a low turn onto final approach, possibly encountered a wind gust, and the airplane stalled.  The pilot reported the winds as being from 270 degrees at 11 knots, gusting to 20 knots.

The winds reported at OSH at 1153 were from 250 degrees at 11 knots, gusting to 15 knots.

## Aircraft

- Registration: [N619BS](https://openairdocs.org/deregistered/N619BS-2018-03-15), registration cancelled 2018-03-15, S/N 003 (OpenAirDocs)
- Reported make and model: Simmons GP-4
- Registry model: [Simmons James K SIMMONS GP4](https://openairdocs.org/model/simmons-james-k-simmons-gp4) (registry code 056149G) (OpenAirDocs)
- Category: Airplane, amateur-built
- Serial number: 003
- Airframe hours: 180
- Engines: Lycoming IO-360-A1A6 200 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: James K. Simmons
- Airworthiness certificate: Special, Experimental (Special)
- Last inspection: Annual, November 1, 2004
- Departed: I19, Dayton, OH
- Destination: OSH, Oshkosh, WI

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 63; injuries: none; private; airplane ratings: single-engine land; medical: class 3; seat: left; flight hours: 2,000 total, 180 in this make and model, 1,950 as pilot in command, 18 in the last 90 days, 11 in the last 30 days, 5 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 250° at 11 knots, gusting 15
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 91 °F, dew point 73 °F
- Altimeter: 29.79 inHg
- Observed at: OSH

## 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 20050724024529A](https://openairdocs.org/incident/20050724024529A), Jul 24, 2005: SIMMONSGP4, Oshkosh, WI, Substantial damage. (-23) Aircraft was stalled above runway and crashed in a left wing low.

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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