# NTSB CHI85FEP03: Roger W. Stigen EAA Biplane SR-1, N3541, Sprimg Greem, WI, August 27, 1985

- Type: NTSB accident investigation
- Classification: Accident · Serious injuries · Final report
- Date: August 26, 1985, 19:05 local (Aug 27, 1985, 00:05 UTC)
- Place: Sprimg Greem, WI
- Coordinates: 43.170078, -90.059875 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=43.1701&lon=-90.0599&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): 12887
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI85FEP03
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/12887/pdf
- Page: https://openairdocs.org/ntsb/CHI85FEP03

## Sequence of events

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

- Loss of control - in flight, approach - vfr pattern - final approach
  - airspeed - not maintained, pilot in command (cause)
  - diverted attention, pilot in command (cause)
  - stall/spin - inadvertent, pilot in command (cause)
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

EAA BI PLANE N3541, PILOTED BY JOHN BOATRIGHT, AND REGISTERED TO FREEBORN COUNTY AIRCRAFT INC., ALBERT LEA, MINNESOTA, SUSTAINED SUBSTANTIAL DAMAGE DURING A LANDING APPROACH TO RUNWAY 27 AT THE LONE ROCK AIRPORT AT APPROXIMATELY 1900 CDT ON AUGUST 26, 1985. THE PILOT-IN-COMMAND AND SOLE OCCUPANT OF THE AIRCRAFT RECEIVED SERIOUR INJURIES. MR. BOATRIGHT REPORTED THAT HIS ATTENTION WAS DIVERTED AS HE REDUCED POWER TURNIGN FINAL. HE STATED THE AIRCRAFT ENTERED A SPIN. HE STATED HE RECOVERED FROM THE SPIN, BUT WAS TOO LOW TO AVOID COLLISION WITH GROUND. VISUAL METEORLOGICAL CONDITIONS PREVAILED, AND NO FLIGHT PLAN WAS FILED.

## Aircraft

- Registration: [N3541](https://openairdocs.org/deregistered/N3541-2013-03-07), registration cancelled 2013-03-07, S/N 1, built 1969 (OpenAirDocs)
- Reported make and model: ROGER W. STIGEN EAA BIPLANE SR-1 (EAA BIPLAN)
- Registry model: [Eaa Biplane P](https://openairdocs.org/model/eaa-biplane-p) (registry code 33601H1) (OpenAirDocs)
- Registry engine: [Continental C85 series](https://openairdocs.org/engine/continental-c85-series) (registry code 17008, reciprocating) (OpenAirDocs)
- Category: Airplane, amateur-built
- Serial number: 1
- Airframe hours: 525
- Engines: CONTINENTAL C8512F 85 horsepower reciprocating
- Damage: Destroyed
- Flight: Personal, Part 91
- Operator: John R. Boatwright
- Registered owner: Freeborn County Aircraft, Inc.
- Airworthiness certificate: Special, Experimental (Special)
- Last inspection: 100 hour, May 4, 1984, 39 hours before
- Airport: LNR, Tri-County, runway 27, 4,050 × 50 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 39; private; airplane ratings: single-engine land; medical: class 3, valid medical--no waivers/lim.; flight hours: 250 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Wind: 300° at 3 knots
- Visibility: 7 statute miles
- Lowest ceiling: none
- Temperature: 72 °F
- Observed at: MSN, 38 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 19850826041259A](https://openairdocs.org/incident/19850826041259A), Aug 26, 1985: Amtrea EAABIPLANEP, Lone Rock, WI, Destroyed. Attention was diverted during turn to final. Aircraft entered a spin. Recovered but struck the ground.

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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