ASN Wikibase Occurrence # 265491
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| Date: | Thursday 15 July 2021 |
| Time: | 11:54 |
| Type: |  Mooney M20J 201 |
| Owner/operator: | Private |
| Registration: | N4474H |
| MSN: | 24-0744 |
| Engine model: | Lycoming IO-360-A3B6D |
| Fatalities: | Fatalities: 4 / Occupants: 4 |
| Aircraft damage: | Destroyed |
| Category: | Accident |
| Location: | near Dinsmore Airport (D63), Dinsmore, CA -
 United States of America
|
| Phase: | Take off |
| Nature: | Private |
| Departure airport: | Dinsmore Airport, CA (D63) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
On July 15, 2021, at 1154 Pacific daylight time, a Mooney M20J airplane, N4474H, was destroyed when it was involved in an accident near Dinsmore Airport (D63), Dinsmore, California. The pilot, pilot-rated passenger, and two other passengers were fatally injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight.
A witness who was near the departure airport reported observing the airplane circle the area, land on the runway, and stop at the midpoint of the runway. At that time, three people disembarked from the airplane, one of whom walked around the airplane. All three people then boarded the airplane, and the airplane taxied toward the approach end of the runway. The witness observed the airplane take off and stated that the airplane appeared to have rotated just short of the displaced runway threshold. The witness stated that the airplane “barely cleared the fence” and that the rotation was not smooth. Subsequently, the airplane impacted trees just beyond the departure end of the runway, where a postimpact fire ensued.
Postaccident examination of the engine revealed that the intake camlobes were worn and exhibited a rounded (instead of an elliptical) shape. The corresponding tappets for the intake cam lobes were galled. The alteration of the camlobe profile will in turn alter the amount and duration of the intake valves opening, thus negatively affecting power output. As a result, takeoff and climb performance would be directly affected. Although the extent of the degradation to the accident engine's power output could not be determined from the available evidence, the degradation was likely sufficient to cause a partial loss of engine power.
Probable Cause: The airplane’s degraded engine performance due to wear to the intake cam lobes, which diminished the airplane’s takeoff and climb performance, resulting in a subsequent collision with trees.
Accident investigation:
 |
|
Sources:
https://kymkemp.com/2021/07/15/airplane-crash-at-dinsmore-airport-fire-spreading/
https://www.google.com/amp/s/www.sandiegouniontribune.com/news/california/story/2021-07-15/multiple-people-dead-in-california-small-plane-crash%3f_amp=true
https://krcrtv.com/north-coast-news/eureka-local-news/multiple-fatalities-occur-in-plane-crash-at-dinsmore-airport
https://data.ntsb.gov/Docket?ProjectID=103489
https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=N4474H
https://www.airport-data.com/images/aircraft/001/449/001449258.jpg (photo)
Location
Images:
Media:
#HappeningNow Sheriff’s deputies enroute to the Dinsmore Airport for the report of a small aircraft crash nearby. Unknown number of passengers or injuries at this time. HWY 36 is temporary closed to traffic near the airport. More information will be released when available.
— HumCoSO (@HumCoSO) July 15, 2021
NTSB is investigating the July 15, 2021, crash of a Mooney M20J airplane near Dinsmore, California.
— NTSB_Newsroom (@NTSB_Newsroom) July 15, 2021
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 15-Jul-2021 23:04 | Captain Adam | Added |
| 16-Jul-2021 00:32 | Captain Adam | Updated [Total fatalities, Total occupants, Other fatalities, Source, Embed code] |
| 16-Jul-2021 07:29 | RobertMB | Updated [Time, Narrative] |
| 16-Jul-2021 07:29 | Anon. | Updated [Total fatalities, Total occupants, Source] |
| 16-Jul-2021 09:12 | Captain Adam | Updated [Total fatalities, Total occupants, Source] |
| 16-Jul-2021 13:39 | RobertMB | Updated [Time, Aircraft type, Registration, Cn, Operator, Source, Narrative] |
| 16-Jul-2021 13:41 | Anon. | Updated [Total fatalities, Total occupants, Source] |
| 16-Jul-2021 15:45 | Anon. | Updated [Time, Total fatalities, Total occupants, Phase, Source, Narrative, Category] |
| 16-Jul-2021 20:14 | Captain Adam | Updated [Total fatalities, Total occupants, Phase, Source, Narrative] |
| 17-Jul-2021 03:45 | RobertMB | Updated [Location, Source, Narrative] |
| 21-Jul-2021 07:58 | aaronwk | Updated [Narrative] |
| 07-Aug-2021 07:58 | aaronwk | Updated [Time, Source, Narrative] |
| 14-Jul-2022 14:03 | Captain Adam | Updated [Location, Narrative] |
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