ASN Wikibase Occurrence # 266629
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| Date: | Wednesday 11 August 2021 |
| Time: | 09:00 |
| Type: |  Cessna 425 Conquest I |
| Owner/operator: | K-Aero LLC |
| Registration: | N783MB |
| MSN: | 425-0103 |
| Year of manufacture: | 1982 |
| Total airframe hrs: | 9576 hours |
| Engine model: | P&W PT6A-112 |
| Fatalities: | Fatalities: 0 / Occupants: 3 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | near Helena Regional Airport (HLN/KHLN), Helena, MT -
 United States of America
|
| Phase: | En route |
| Nature: | Private |
| Departure airport: | Faribault Municipal Airport, MN (FBL/KFBL) |
| Missoula-Johnson-Bell Field, MT (MSO/KMSO) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
On August 11, 2021, about 0900 mountain daylight time, a Cessna 425 Conquest 1, N783MB, sustained substantial damage when it was involved in an accident near Helena, Montana. The pilot and two passengers sustained serious injuries. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 business flight.
The pilot stated that on the morning of the accident he filled both wing fuel tanks to full. After takeoff, he climbed to his planned cruise altitude of 24,000 ft mean sea level (msl). While en route to his destination, the pilot reported that the left engine experienced a flame-out. The pilot opted to divert from the originally planned destination and descended. When the airplane was about 7,900 ft msl, the pilot reported that the right engine experienced a loss of power and that he was not going to be able to make it to the airport. Shortly thereafter, the airplane collided with trees and the airplane came to rest with the right wing and empennage severed from the fuselage.
There was fuel in the wing tanks at the time of the impact. Postaccident examination of the wreckage did not reveal any anomalies. A partial amount of fuel was found in both of the filter bowls, but it is unknown if fuel was able to reach the engines. A complete examination of the fuel system could not be completed due to the damage incurred to the airplane at impact. Both engines flaming out within a short time of one another is likely indicative of a fuel supply or delivery issue; however, the nature of the problem could not be identified during postaccident examination.
Probable Cause: A flameout of both engines due to fuel starvation for reasons that could not be determined due to the airplane’s damage.
Accident investigation:
 |
|
Sources:
https://www.ktvh.com/news/helena-news/twin-engine-plane-crashes-north-of-helena
https://helenair.com/news/local/3-injured-wednesday-in-plane-crash-north-of-helena/article_561da7b5-61a0-55c8-b05b-d9f4ab25ef39.html
https://data.ntsb.gov/Docket?ProjectID=103681
https://registry.faa.gov/aircraftinquiry/Search/NNumberResult?nNumberTxt=783MB
https://globe.adsbexchange.com/?icao=aa9cc0&lat=46.587&lon=-111.866&zoom=9.3&showTrace=2021-08-11
https://cdn.jetphotos.com/full/6/49949_1587610142.jpg (photo)
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 11-Aug-2021 20:35 | Geno | Added |
| 11-Aug-2021 23:04 | RobertMB | Updated [Aircraft type, Registration, Cn, Operator, Phase, Source] |
| 12-Aug-2021 13:35 | Anon. | Updated [Source, Narrative] |
| 12-Aug-2021 16:48 | aaronwk | Updated [Narrative] |
| 07-Sep-2021 19:37 | aaronwk | Updated [Time, Source, Narrative, Category] |
Corrections or additions? ... Edit this accident description
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