- Location: San Rafael, California
- Accident Number: WPR23FA258
- Date & Time: July 8, 2023, 22:01 Local
- Registration: N4922G
- Aircraft: Cessna 172N
- Aircraft Damage: Substantial
- Defining Event: Fuel related
- Injuries: 1 Fatal, 1 Serious
- Flight Conducted Under: Part 91: General aviation - Personal
https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/192562/pdf
https://data.ntsb.gov/Docket?ProjectID=192562
On July 8, 2023, at 2203 Pacific daylight time, a Cessna 172N, N4922G, was substantially damaged when it was involved in an accident near San Rafael, California. The pilot was seriously injured, and the passenger was fatally injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight.
The pilot was on a night cross-country flight and began an enroute descent about 65 miles from the destination airport. When the pilot attempted to add engine power to level off at a lower altitude, the engine did not respond. The pilot attempted to troubleshoot the loss of engine power, including selecting carburetor heat, but without success. As the airplane continued to descend, it struck a powerline near the approach end of the runway and impacted a water canal. During the accident sequence the fuselage and both wings sustained substantial damage.
The pilot did not report that he activated the carburetor heat during the descent, as called for in the pilot’s operating handbook normal descent procedures “as required – for carburetor icing conditions.” The pilot reported that he would not normally select the carburetor heat until the airplane was below 1500 ft and entering the traffic pattern.
Postaccident examination of the airplane revealed no evidence of any preaccident mechanical malfunctions or failures that would have precluded normal operation. Review of weather information indicated that the airplane was operating in an area conducive to the development of serious carburetor icing at cruise power. It is likely that the carburetor accumulated ice during the prolonged descent without the use of carburetor heat, which resulted in a total loss of engine power.
The accident is consistent with a total loss of engine power due to carburetor icing as a result of the pilot’s failure to activate the carburetor heat in a timely manner during the descent.
- Probable Cause: The total loss of engine power due to carburetor icing as a result of the pilot’s failure to activate the carburetor heat in a timely manner during the descent.
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