# NTSB CHI94LA156: Cessna 150F, N6872F, Chippewa Falls, WI, May 12, 1994 - Type: NTSB accident investigation - Classification: Accident · No injuries · Limited investigation · Final report - Date: May 12, 1994, 18:45 local (23:45 UTC) - Place: Chippewa Falls, WI - Coordinates: 44.92992, -91.389785 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=44.9299&lon=-91.3898&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 January 12, 1995 - Report: Approved by Office Director - NTSB case key (mKey): 9526 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI94LA156 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/9526/pdf - Page: https://openairdocs.org/ntsb/CHI94LA156 ## Probable cause the loss of engine power due to a binding carburetor heat door. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power(partial) - mech failure/malf, takeoff - initial climb - carburetor heat control - binding(mechanical) (cause) - Forced landing, descent - emergency - Hard landing, descent - emergency - terrain condition - grass - Nose over, landing - roll ## Analysis THE FLIGHT INSTRUCTOR AND STUDENT PILOT BOTH REPORTED A PARTIAL LOSS OF ENGINE POWER JUST AFTER TAKEOFF. DURING THE FORCED LANDING THE NOSE GEAR SHEARED OFF, AND THE AIRPLANE NOSED-OVER. FAA INSPECTORS EXAMINED AND RAN THE ENGINE. DURING THE ENGINE EXAMINATION, THE CARBURETOR HEAT DOOR WAS FOUND TO BE BINDING AND COULD NOT BE FULLY TURNED OFF. ## Factual narrative On May 12, 1994, about 1845 central daylight time, a Cessna 150F, N6872F, sustained substantial damage in a hard landing and nose- over following a loss of engine power on takeoff at a private airstrip near Chippewa Falls, Wisconsin. Neither the certified flight instructor, nor the student pilot were injured. No flight plan was filed for the instructional flight, and visual meteorological conditions prevailed at the time. The flight instructor and the student both stated the engine had a partial loss of power shortly after takeoff, and the airplane settled back to the runway. The nose landing gear sheared off and the airplane nosed-over. Two Federal Aviation Administration Inspectors examined and ran the engine. The inspectors found the carburetor heat control was actuated and could not be turned completely off. The carburetor heat door was catching on a nut which allowed the door to have a limited range of operation. ## Aircraft - Registration: [N6872F](https://openairdocs.org/aircraft/N6872F), registered now, S/N 15063472, built 1966 (OpenAirDocs) - Reported make and model: CESSNA 150F - Registry model: [Cessna 150F](https://openairdocs.org/model/cessna-150f) (registry code 2071814) (OpenAirDocs) - Registry engine: [Continental 0-200 series](https://openairdocs.org/engine/continental-0-200-series) (registry code 17020, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 15063472 - Airframe hours: 1816 - Engines: CONTINENTAL O-200-A 100 horsepower reciprocating - Damage: Substantial damage - Flight: Instructional, Part 91 - Registered owner: Bernardo A. Kuhlman - Airworthiness certificate: Standard, Utility - Last inspection: Annual, July 29, 1993, 17 hours before - Airport: NONE, Kuhlman (Pvt), runway 33, 1,600 × 75 ft, grass/turf ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 52; commercial, flight instructor; airplane ratings: single-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: right; flight hours: 1,785 total, 1,720 as pilot in command, 28 in the last 90 days, 9 in the last 30 days ## Weather - Conditions: Visual (VMC), Day - Wind: 310° at 3 knots - Visibility: 20 statute miles - Lowest ceiling: none - Temperature: 66 °F, dew point 36 °F - Altimeter: 30.00 inHg - Observed at: EAU, 12 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 19940512010669A](https://openairdocs.org/incident/19940512010669A), May 12, 1994: Cessna 150F, Chippewa Falls, WI, Substantial damage. Lost partial power on takeoff. Sheared nose gear on forced landing. Carb heat door binding. Carb heat stayed on. ## Other investigations on N6872F (2) 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. - [NTSB CHI72DEP12](https://openairdocs.org/ntsb/CHI72DEP12), Aug 15, 1971: Cessna 150 (N6872F), Gays Mills, WI, substantial damage - [NTSB FTW68F0152](https://openairdocs.org/ntsb/FTW68F0152), Aug 10, 1967: Cessna 150 (N6872F), Friendswood, TX, substantial damage 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. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.