# NTSB MKC88DCD01: Bohnker Tierra II, N116LB, Audubon, IA, June 5, 1988

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: June 5, 1988, 09:15 local (14:15 UTC)
- Place: Audubon, IA
- Coordinates: 41.710117, -94.919288 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=41.7101&lon=-94.9193&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report July 10, 1989
- Report: Approved by Office Director
- NTSB case key (mKey): 34454
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=MKC88DCD01
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/34454/pdf
- Page: https://openairdocs.org/ntsb/MKC88DCD01

## Sequence of events

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

- Loss of control - in flight, takeoff - initial climb
  - directional control - not maintained, pilot in command (cause)
- In flight collision with terrain/water, takeoff - aborted
- On ground/water collision with object, landing - roll
  - object - other person
  - object - aircraft parked/standing

## Analysis

THE PILOT STATED THAT THE TAKEOFF RUN AND LIFTOFF APPEARED NORMAL, BUT AFTER LIFTOFF THE AIRCRAFT VEERED TO THE RIGHT (INTO THE CROSSWIND). THE PILOT ATTEMPTED TO CORRECT WITH LEFT RUDDER AND AILERON. WHEN HE WAS UNSUCCESSFUL, HE RETARDED THROTTLE. THE PLANE STRUCK THE GROUND WITH THE RIGHT WING AND RIGHT LANDING GEAR, STARTED TO GROUND-LOOP, HIT TWO PEDESTRIANS AND A PARKED A/C.

## Aircraft

- Registration: [N116LB](https://openairdocs.org/deregistered/N116LB-1997-09-11), registration cancelled 1997-09-11, S/N 01 (OpenAirDocs)
- Reported make and model: BOHNKER TIERRA II
- Registry model: [Bohnker Larry L TIERRA II](https://openairdocs.org/model/bohnker-larry-l-tierra-ii) (registry code 05676F5) (OpenAirDocs)
- Category: Airplane, amateur-built
- Serial number: 1
- Airframe hours: 125
- Engines: ROTAX 534 65 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Larry Bohnker
- Registered owner: Bohnker, Larry L.
- Airworthiness certificate: Special, Experimental (Special)
- Last inspection: Annual, January 17, 1988, 31 hours before
- Destination: DNS, DENISON, IA
- Airport: ADU, Audubon Municipal, runway 14, 3,000 × 60 ft, concrete

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 31; private; airplane ratings: single-engine land; medical: class 3, valid medical--no waivers/lim.; seat: left; flight hours: 181 total, 115 in this make and model, 181 as pilot in command, 2 in the last 90 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 190° at 6 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 66 °F, dew point 54 °F
- Altimeter: 30.00 inHg

## 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 19880605017829A](https://openairdocs.org/incident/19880605017829A), Jun 5, 1988: Amtrte TIERRA2, Audubon, IA, Substantial damage. After liftoff, aircraft veered to the right. Aborted takeoff. A wing struck 2 persons and a parked aircraft.

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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