ASN Wikibase Occurrence # 267095
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| Date: | Wednesday 25 August 2021 |
| Time: | 09:45 LT |
| Type: |  Cessna 150D |
| Owner/operator: | Private |
| Registration: | N4375U |
| MSN: | 15060375 |
| Year of manufacture: | 1964 |
| Total airframe hrs: | 4878 hours |
| Engine model: | Continental O-200 |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | near Chino Airport (CNO/KCNO), Chino, CA -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Chino Airport, CA (CNO/KCNO) |
| Chino, CA | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot flew in the local area for about 2 hours 45 minutes and then began to return to the departure airport. While the airplane was descending to 2,500 ft mean sea level, the engine surged, prompting the pilot to use carburetor heat. After a brief period of normal engine operation, the engine surging resumed, resulting in a partial power loss as the airplane approached the airport. Despite the pilot's attempts to troubleshoot the issue, the airplane was unable to maintain altitude. The pilot performed an off-airport landing, during which the airplane collided with a fence.
During the recovery of the airplane, about 3.5 to 4 gallons of fuel from the left wing and about 0.5 gallons of fuel from the right wing were drained, and both the carburetor bowl and gascolator contained fuel. The fuel tanks in the wing were intact, but fuel was dripping from the left fuel vent due to the angle at which the airplane came to rest (left wing down). Because fuel was dripping from the vent, the investigation could not determine if the airplane had a sufficient amount of fuel aboard at the time of the engine failure; the amount of fuel found in the tanks did not represent the amount of fuel aboard before impact.
The Federal Aviation Administration (FAA) Carburetor Icing Probability Chart revealed that the outside air temperature and dew point temperature were within the "serious icing at glide power" portion of the chart, and the pilot reported haze in the area. An FAA Special Airworthiness Information Bulletin emphasized the risk of carburetor icing, even in above-freezing conditions with visible moisture, due to fuel vaporization and air expansion. Thus, it is likely that carburetor icing during the accident flight resulted in the loss of engine power, which might have been mitigated if the pilot had applied carburetor heat earlier in the descent.
Probable Cause: The pilot's delayed use of carburetor heat, which resulted in a loss of engine power due to carburetor icing.
Accident investigation:
 |
|
Sources:
NTSB WPR21LA329
FAA register: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=4375U
https://flightaware.com/live/flight/N4375U/history/20210825/1355Z/KCNO/L%2033.99609%20-117.58925
Location
Media:
Single-engine plane makes emergency landing in Ontario field https://t.co/74f5i5tFOG pic.twitter.com/pffr2KYPlT
— GNN (@gnnhdofficial) August 26, 2021
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 25-Aug-2021 20:05 | Geno | Added |
| 26-Aug-2021 06:59 | harro | Updated [Registration, Source, Embed code] |
| 26-Aug-2021 07:04 | harro | Updated [Departure airport, Source, Embed code] |
| 26-Aug-2021 07:06 | harro | Updated [Departure airport] |
| 26-Aug-2021 07:11 | harro | Updated [Time, Aircraft type, Registration, Cn, Operator, Phase, Departure airport, Source, Category] |
| 26-Aug-2021 09:05 | aaronwk | Updated [Time, Nature, Narrative] |
| 26-Aug-2021 19:59 | Anon. | Updated [Phase, Nature, Source, Category] |
| 21-Sep-2023 11:48 | ASN Update Bot | Updated [[Phase, Nature, Source, Category]] |
Corrections or additions? ... Edit this accident description
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