# NTSB CHI98LA227: Commonwealth 185, N92997, Oregon, WI, June 28, 1998 - Type: NTSB accident investigation - Classification: Accident · Minor injuries · Limited investigation · Final report - Date: June 28, 1998, 14:30 local (19:30 UTC) - Place: Oregon, WI - Coordinates: 42.91904, -89.380958 (estimated) - Nearby events: https://openairdocs.org/map.md?lat=42.9190&lon=-89.3810&mi=10 - Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping) - Highest injury: Minor injuries - Injuries: 1 minor - Status: Completed, report February 15, 2001 - Report: Approved by Office Director - NTSB case key (mKey): 10941 - NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CHI98LA227 - NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/10941/pdf - Page: https://openairdocs.org/ntsb/CHI98LA227 ## Probable cause the improper adjustment of the carburetor by an unqualified person. Factors to the accident were the annual inspection not being complied with and the lack of recent experience of the pilot. ## Sequence of events In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf). - Loss of engine power, takeoff - initial climb - fuel system,carburetor (cause) - maintenance,adjustment - improper, unqualified person (cause) - maintenance,annual inspection - not complied with, pilot in command (contributing factor) - lack of recent experience, pilot in command (contributing factor) - Forced landing, emergency descent/landing - In flight collision with terrain/water, emergency descent/landing ## Analysis The FAA inspector stated that the aircraft lost power soon after takeoff from the private airstrip. Post accident investigation showed that the aircraft was using auto-gas. There was no Supplemental Type Certificate (STC) found to be issued by the FAA for the use of auto-gas for the aircraft in question. Approximately 1/4 cup of oil was drained from the number two cylinder. The lower spark plug of the number two cylinder was oil fouled. The number one cylinder upper spark plug lead fell apart when removed from the cylinder. The right magneto did not produce a spark when a functional test was conducted. The pilot had stated that on the day of the accident he had noticed that the carburetor of his aircraft was running 'Over.' The pilot stated that he readjusted the carburetor to specifications. The most recent annual inspection was completed on October 10, 1996. The last 90-day student solo sign off was in October of 1997. According to the pilot's written statement there was no record of flying for at least 90 days prior to the date of the accident. ## Factual narrative On June 28, 1998, at 1430 central daylight time, a Commonwealth 185, NC92997, piloted by a student pilot, sustained substantial damage when it impacted the terrain during a forced landing following a loss of engine power during takeoff from runway 36 (2000' x 30', wet, grass) at a private airstrip near Oregon, Wisconsin. Visual meteorological conditions prevailed at the time of the accident. The 14 CFR Part 91 personal flight was not operating on a flight plan. The pilot reported minor injuries. The local flight was originating at the time of the accident. In a Federal Aviation Administration (FAA) inspector's statement, the inspector stated that he had interviewed the pilot, subsequent to the accident, and the pilot stated that he had no recollection of the events surrounding the accident. The pilot had sustained, as a result of the accident, a closed head trauma just above his right eye and bridge of nose. The FAA inspector stated, in his written statement, that the aircraft's engine lost power soon after takeoff from the private airstrip. The inspector stated that the aircraft was found 300 yards from the end of the airstrip. Post accident investigation showed that the aircraft was using auto-gas. There was no Supplemental Type Certificate (STC) found to be issued by the FAA for the use of auto-gas in the above stated aircraft. Approximately 1/4 cup of oil was drained from the number two cylinder. The lower spark plug of the number two cylinder was oil fouled. The number one cylinder upper spark plug lead fell apart when removed from the cylinder. The right magneto did not produce a spark when a functional test was conducted. In a statement to a Dane County Sheriff's Office deputy, the pilot stated that on the day of the accident he had noticed that the carburetor of his aircraft was running "Over." The pilot stated that he readjusted the carburetor to specifications. According to a FAA inspector statement, the most recent annual inspection was completed on October 10, 1996. The FAA inspector stated in a phone conversation, with the investigator-in-charge (IIC), that the last 90-day student solo sign off was in October of 1997. According to the pilot's written statement there was no record of flying for at least 90 days prior to the date of the accident. ## Aircraft - Registration: [N92997](https://openairdocs.org/aircraft/N92997), registered now, S/N 1731, built 1946 (OpenAirDocs) - Reported make and model: Commonwealth 185 - Registry model: [Commonwealth 185](https://openairdocs.org/model/commonwealth-185) (registry code 2370608) (OpenAirDocs) - Registry engine: [Continental C85 series](https://openairdocs.org/engine/continental-c85-series) (registry code 17008, reciprocating) (OpenAirDocs) - Category: Airplane - Serial number: 1731 - Engines: Continental C85 85 horsepower reciprocating - Damage: Substantial damage - Flight: Personal, Part 91 - Registered owner: Louis E. Spink - Airworthiness certificate: Standard, Normal - Last inspection: Annual, October 1, 1996 - Departed: PVT - Airport: PVT, runway 36, 2,000 × 30 ft, grass/turf ## Flight crew As NTSB recorded them. NTSB leaves out names. - Pilot; age 66; student; medical: class 3, valid medical--no waivers/lim.; seat: left; flight hours: 38 total, 38 in this make and model ## Weather - Conditions: Visual (VMC), Day - Wind: variable at 6 knots - Visibility: 10 statute miles - Lowest ceiling: none - Temperature: 81 °F, dew point 66 °F - Altimeter: 29.00 inHg - Observed at: MSN, 15 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 19980628015229A](https://openairdocs.org/incident/19980628015229A), Jun 28, 1998: Cessna 185, Oregon, WI, Substantial damage. While flying in vicinity of a Private strip, acft encountered carburetor problems, landed short. (.19)on June 28, 1998, at 1430 central daylight time(CDT), a… 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.