# NTSB CHI91DCQ08: Sebly Amateur Built ACRO-SPORT II, N391KS, Columbus, KS, June 29, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: June 29, 1991, 12:10 local (17:10 UTC)
- Place: Columbus, KS
- Coordinates: 37.159206, -94.840362 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=37.1592&lon=-94.8404&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report March 9, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 14815
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI91DCQ08
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/14815/pdf
- Page: https://openairdocs.org/ntsb/CHI91DCQ08

## Probable cause

A LOSS OF ENGINE POWER FOR UNDETERMINED REASONS.  A FACTOR ASSOCIATED WITH THE ACCIDENT IS SOFT TERRAIN IN THE FORCED LANDING AREA.

## Sequence of events

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

- Loss of engine power(total) - mech failure/malf, cruise
  - reason for occurrence undetermined (cause)
- Forced landing, descent - emergency
- In flight collision with terrain/water, landing - flare/touchdown
  - terrain condition - soft (contributing factor)

## Analysis

THE PILOT REPORTED THAT WHILE OVERTAKING ANOTHER AIRPLANE INFLIGHT HE CLOSED THE THROTTLE.  WHEN HE ADVANCED THE THROTTLE THE ENGINE DID NOT RESPOND.  THE AIRPLANE WAS DAMAGED DURING A FORCED LANDING TO A 'LOOSE WORKED BEAN FIELD.' POST ACCIDENT INSPECTION OF THE AIRPLANE AND ENGINE FAILED TO REVEAL THE REASON FOR THE LOSS OF POWER.

## Aircraft

- Registration: [N391KS](https://openairdocs.org/aircraft/N391KS), registered now, S/N 391, built 1989 (OpenAirDocs)
- Reported make and model: SEBLY AMATEUR BUILT ACRO-SPORT II (ACRO-SPORT)
- Registry model: [Sibley Kent V ACRO SPORT II](https://openairdocs.org/model/sibley-kent-v-acro-sport-ii) (registry code 05646EA) (OpenAirDocs)
- Registry engine: [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series) (registry code 41508, reciprocating) (OpenAirDocs)
- Category: Airplane, amateur-built
- Serial number: 391
- Engines: AVCO LYCOMING O-320-D2B 160 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Kenneth Frobish
- Registered owner: Kent V. Sebley
- Airworthiness certificate: Special, Experimental (Special)
- Last inspection: 100 hour, May 20, 1991, 10 hours before

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 53; private; airplane ratings: single-engine land; medical: class 3, valid medical--no waivers/lim.; seat: front; flight hours: 200 total, 10 in this make and model, 150 as pilot in command, 100 in the last 90 days

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 1 statute miles
- Lowest ceiling: none

## 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 19910629024789A](https://openairdocs.org/incident/19910629024789A), Jun 29, 1991: Amtrea ACROSPORT, Columbus, KS, Substantial damage. Lost power at cruise. Forced landing in soft field.

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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