De Havilland BEAVER DHC-2 MK.1 N6784L
24 July 2007 · Kalispell, Montana, United States · No injuries
Summary
On 24 July 2007 at about 00:30 local time, a De Havilland BEAVER DHC-2 MK.1 registered N6784L was involved in an accident near Kalispell, Montana, United States. 3 people were on board and nobody was injured. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.
The record
- Date
- at 00:30
- Classification
- Accident
- Location
- Kalispell, Montana, United States
- Coordinates
- Not recorded
- Aircraft
- De Havilland BEAVER DHC-2 MK.1
- Registration
- N6784L
- Category
- Airplane
- Engines
- 1
- Operator
- Not recorded
- Operating rule
- Part 91: General Aviation
- Purpose of flight
- Personal
- Phase of flight
- Not recorded
- Route
- Mount Vernon → Lewiston
- Aircraft damage
- Substantial
- Weather
- VMC
- Light
- Day
- NTSB number
- LAX07LA238
People
Nobody was injured.
| On board | Died | Serious | Minor | Uninjured |
|---|---|---|---|---|
| 3 | 0 | 0 | 0 | 3 |
Probable cause
A loss of engine power due to the failure of the supercharger impeller bushing, which allowed raw oil to enter the induction system.
Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.
Read the full NTSB narrative
While in cruise flight over a wilderness area, the engine sputtered and then lost power. The pilots attempted to restart the engine, and then began to look for a place to land. The pilot landed the airplane on a gravel/sand bar area near a river. The airplane sustained structural damage to the firewall, a wing strut, and leading edge damage to the horizontal stabilizer. The pilots reported that the oil pressure and cylinder head temperature gages were in the green prior to the event, and there was no indication that there was anything wrong. An inspection of the engine revealed that the master rod end had broken. No metal pieces were observed in either the oil filter or oil sump. Further inspection of the engine revealed that the supercharger impeller shaft bearings (blower bushing) had failed. The supercharger impeller bearings are an area that requires lubrication, and if they fail, raw oil can be pumped into the induction system, which could cause various engine problems, including detonation.
Quoted verbatim from the NTSB record.
Other De Havilland BEAVER accidents
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 28 Sep 2008 | De Havilland BEAVER DHC | Cooper Landing, Alaska, United States | Alaska Air Taxi, LLC | No injuries | - |
| 4 Aug 2008 | De Havilland BEAVER DHC-2 MK.1 | Kenmore, Washington, United States | Richard P Emerson | No injuries | - |
| 22 Jul 2009 | De Havilland BEAVER DHC-2 | Iliamna, Alaska, United States | Iliamna Air Taxi Inc | No injuries | - |
| 23 Aug 2005 | De Havilland BEAVER DHC-2 MK.1 | Aleknagik, Alaska, United States | Mission Creek Lodge | Minor injuries | - |
| 23 Jul 2010 | De Havilland BEAVER DHC-2 MK.1 | Ketchikan, Alaska, United States | Pacific Airways, Inc. | Fatal | 1 |
| 19 Sep 2010 | De Havilland BEAVER DHC-2 MK.1 | Renton, Washington, United States | - | No injuries | - |
Other accidents in this area
| Date | Aircraft | Location | Operator | Outcome | Died |
|---|---|---|---|---|---|
| 1 Jun 2007 | Cessna 210F | Denton, Montana, United States | William Booty | No injuries | - |
| 13 Sep 2007 | Cessna 172L | Helena, Montana, United States | - | No injuries | - |
| 3 Jun 2007 | Aviat HUSKY A1-B | Winston, Montana, United States | Jon C Kantorowicz | Serious injuries | - |
| 5 Mar 2007 | Bell 206 B3 | Custer, Montana, United States | Dan S. Scott | No injuries | - |
| 28 Apr 2007 | Britten-Norman BN-2A-20 | Hamilton, Montana, United States | McCall Aviation | Minor injuries | - |
| 16 Jul 2007 | Bell UH-1H | Benchmark, Montana, United States | United States Forest Service | Minor injuries | - |