The National Transportation Safety Board did not travel to the scene of this accident.
Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; Salt Lake City, Utah
Aviation Accident Final Report - National Transportation Safety Board: https://app.ntsb.gov/pdf
Investigation Docket - National Transportation Safety Board: https://dms.ntsb.gov/pubdms
Aviation Accident Data Summary - National Transportation Safety Board: https://app.ntsb.gov/pdf
http://registry.faa.gov/NN83SB
Location: Montrose, CO
Accident Number: CEN18LA068
Date & Time: 01/04/2018, 1600 MST
Registration: N83SB
Aircraft: BARNES STEVEN D STEVE BARNES RV 4
Aircraft Damage: Substantial
Defining Event: Loss of engine power (total)
Injuries:1 None
Flight Conducted Under: Part 91: General Aviation - Personal
Analysis
The commercial pilot departed on a local flight and began a 120-mph cruise climb. After the airplane cleared some high terrain, the pilot leaned the engine fuel-air mixture, but the engine began to operate roughly. The pilot enriched the mixture, and the engine began to operate smoothly but then lost total power. The pilot performed emergency procedures, which included an attempted engine restart. The pilot stated that he pumped the throttle twice and that the engine responded with "2 small bursts of 500-600 rpms," but then there was no additional engine power. The pilot executed a forced landing to a nearby private airfield but was unable to reach the runway, and the airplane impacted terrain and farm equipment.
A postaccident examination of the airplane fuel system revealed no anomalies. The carburetor could not be tested because it was destroyed during the accident sequence. A postaccident engine examination showed no evidence of preimpact mechanical malfunctions or abnormalities. Thus, the reason(s) for the total loss of engine power could not be determined.
Probable Cause and Findings
The National Transportation Safety Board determines the probable cause(s) of this accident to be:
The total loss of engine power for reasons that could not be determined because a postaccident examination of the engine did not reveal any mechanical malfunctions or failures that would have precluded normal operation.
Findings
Not determined
Not determined - Unknown/Not determined (Cause)
Factual Information
On January 4, 2018, about 1600 mountain standard time, a Barnes RV-4 airplane, N83SB, lost engine power and executed a forced landing near Montrose, Colorado. The commercial rated pilot was not injured, and the airplane sustained substantial damage. The airplane was registered to and operated by a private individual under the provisions of Title 14 Code of Federal Regulations Part 91 as a personal flight. Day visual meteorological conditions prevailed at the time of the accident, and a flight plan was not filed. The local flight departed the Clifford Field Airport (1CO4), Olathe, Colorado, about 1555.
According to the pilot, he departed 1CO4 and began a 120-mph cruise climb. After clearing some high terrain, the pilot leaned the engine mixture and the engine began to operate rough, so he began to enrich the mixture. Subsequently, the engine began to operate smoothly, and then lost total power. The pilot performed his emergency procedures which included an attempted engine restart. The pilot pumped the throttle twice, the engine responded with "2 small bursts of 500-600 rpms", and then no additional engine power. The pilot executed a forced landing to a nearby private airfield; however, was unable to make the runway, and the airplane impacted terrain and farm equipment.
Examination of the airplane by a Federal Aviation Administration inspector and the pilot revealed the fuel system and fuel lines were clear of contaminants and no issues were noted. The engine carburetor was destroyed during the accident sequence. No mechanical anomalies were noted with the airframe or engine.
History of Flight
Enroute-climb to cruise
Loss of engine power (total) (Defining event)
Emergency descent
Collision with terr/obj (non-CFIT)
Pilot Information
Certificate: Commercial
Age: 45, Male
Airplane Rating(s): Single-engine Land
Seat Occupied: Front
Other Aircraft Rating(s): None
Restraint Used: 5-point
Instrument Rating(s): Airplane
Second Pilot Present: No
Instructor Rating(s): None
Toxicology Performed: No
Medical Certification: Class 2 Without Waivers/Limitations
Last FAA Medical Exam: 11/17/2017
Occupational Pilot: No
Last Flight Review or Equivalent: 12/06/2016
Flight Time: 8688 hours (Total, all aircraft), 49 hours (Total, this make and model), 8563 hours (Pilot In Command, all aircraft), 23 hours (Last 90 days, all aircraft), 17 hours (Last 30 days, all aircraft), 3 hours (Last 24 hours, all aircraft)
Aircraft and Owner/Operator Information
Aircraft Make: BARNES STEVEN D
Registration: N83SB
Model/Series: STEVE BARNES RV 4 NO SERIES
Aircraft Category: Airplane
Year of Manufacture: 1991
Amateur Built: Yes
Airworthiness Certificate: Experimental
Serial Number: 1171
Landing Gear Type: Tailwheel
Seats: 2
Date/Type of Last Inspection: 01/26/2017, Condition
Certified Max Gross Wt.: 1550 lbs
Time Since Last Inspection:
Engines: 1 Reciprocating
Airframe Total Time: 1795.3 Hours as of last inspection
Engine Manufacturer: LYCOMING
ELT: Installed, not activated
Engine Model/Series: O-320-B3B
Registered Owner: FELIX DAVID S
Rated Power: 160 hp
Operator: On file
Operating Certificate(s) Held: None
Meteorological Information and Flight Plan
Conditions at Accident Site: Visual Conditions
Condition of Light: Day
Observation Facility, Elevation: MTJ, 5758 ft msl
Distance from Accident Site: 9 Nautical Miles
Observation Time: 1553 MST
Direction from Accident Site: 270°
Lowest Cloud Condition: Clear
Visibility: 10 Miles
Lowest Ceiling: None
Visibility (RVR):
Wind Speed/Gusts: 5 knots /
Turbulence Type Forecast/Actual: / None
Wind Direction: 290°
Turbulence Severity Forecast/Actual: /
Altimeter Setting: 30.25 inches Hg
Temperature/Dew Point: 6°C / -16°C
Precipitation and Obscuration: No Precipitation
Departure Point: Olathe, CO (1CO4)
Type of Flight Plan Filed: None
Destination: Olathe, CO (1CO4)
Type of Clearance: None
Departure Time: 1555 MST
Type of Airspace: Class G
Wreckage and Impact Information
Crew Injuries: 1 None
Aircraft Damage: Substantial
Passenger Injuries: N/A
Aircraft Fire: None
Ground Injuries: N/A
Aircraft Explosion: None
Total Injuries: 1 None
Latitude, Longitude: 38.505556, -107.729444
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