# NTSB CHI88DEM06: Koopsen Miller Sport II, N5574A, Lake City, MI, June 10, 1988

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: June 10, 1988, 13:30 local (17:30 UTC)
- Place: Lake City, MI
- Coordinates: 44.329845, -85.199447 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=44.3298&lon=-85.1994&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report August 8, 1989
- Report: Approved by Office Director
- NTSB case key (mKey): 13868
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI88DEM06
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/13868/pdf
- Page: https://openairdocs.org/ntsb/CHI88DEM06

## 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, approach - vfr pattern - base leg/base to final
  - throttle/power lever,linkage - disconnected (cause)
  - acft/equip,inadequate design, manufacturer (contributing factor)
- Forced landing, descent - emergency
- In flight collision with object, descent - emergency
  - object - tree(s) (contributing factor)

## Analysis

JUST PRIOR TO TURNING ON FINAL APPROACH TO LAND, THE PILOT EXPERIENCED A COMPLETE LOSS OF POWER. HE CONTINUED THE APPROACH BUT DECELERATED MORE RAPIDLY THAN HE ANTICIPATED AND WAS UNABLE TO CLEAR A STAND OF TREES ON THE APPROACH PATH. EXAMINATION REVEALED A LOSS OF CONTINUITY IN THE THROTTLE LINKAGE WHICH WAS DISCONNECTED AT THE CARBURETOR. THE OWNER/PLT STATED THAT EVEN THOUGH IT LOOKED SECURE IT WAS POSSIBLE TO PULL THE THROTTLE CABLE LOOSE FROM THE CARBURETOR AND HE THOUGHT IT SHOULD BE REDESIGNED.

## Aircraft

- Registration: [N5574A](https://openairdocs.org/deregistered/N5574A-2013-08-20), registration cancelled 2013-08-20, S/N 10, built 1980 (OpenAirDocs)
- Reported make and model: KOOPSEN MILLER SPORT II (MILLER SPO)
- Registry model: [Koopsen Leon A MILLER SPORT WMII](https://openairdocs.org/model/koopsen-leon-a-miller-sport-wmii) (registry code 05655Z6) (OpenAirDocs)
- Registry engine: [Continental A&C65 series](https://openairdocs.org/engine/continental-a-c65-series) (registry code 17003, reciprocating) (OpenAirDocs)
- Category: Airplane, amateur-built
- Serial number: 10
- Engines: CONTINENTAL A65-8 65 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Paul E. Kauffman
- Airworthiness certificate: Special, Experimental (Special)
- Last inspection: Annual, April 21, 1986, 17 hours before
- Departed: Y17, ACME, MI
- Airport: Y91, Home Acres, runway 36, 2,600 × 150 ft, grass/turf

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 68; private; airplane ratings: single-engine land; medical: class 3, valid medical--w/ waivers/lim; seat: center; flight hours: 1,467 total, 22 in this make and model, 1,397 as pilot in command, 8 in the last 90 days, 3 in the last 30 days, 1 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 330° at 5 knots
- Visibility: 20 statute miles
- Lowest ceiling: none
- Temperature: 81 °F, dew point -0 °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 19880610025509A](https://openairdocs.org/incident/19880610025509A), Jun 10, 1988: Amtr MILLERA, Lake City, MI, Substantial damage. Engine lost power on final. Plane hit trees before main impact. Found throttle linkage disconnected at carburetor.

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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