ASN Wikibase Occurrence # 179491
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| Date: | Friday 11 September 2015 |
| Time: | 07:40 |
| Type: |  Alon A-2 Aircoupe |
| Owner/operator: | Private |
| Registration: | N6359V |
| MSN: | A-35 |
| Year of manufacture: | 1965 |
| Total airframe hrs: | 2875 hours |
| Engine model: | Continental C90-16F |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Interstate I-80 east of Laramie, WY -
 United States of America
|
| Phase: | Landing |
| Nature: | Private |
| Departure airport: | Laramie, WY (LAR) |
| North Platte, NE (LBF) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The private pilot reported that, after departing and then making a slow circling climb to about 9,500 ft mean sea level (msl), the airplane was unable to climb any higher and was occasionally descending. The pilot began to fly on course toward higher terrain, and the engine suddenly began to lose power. The pilot applied carburetor heat, but engine power was not restored. The airspeed then slowed, and the airplane descended. The airplane impacted the concrete median barrier on the highway in a narrow mountain pass at an estimated terrain elevation of 7,980 ft msl and then came to rest upright. There was a fuel spill at the scene but no postimpact fire, and the injured pilot was able to exit the airplane without assistance. A postaccident examination of the airplane and engine found no preaccident mechanical malfunctions or failures that would have precluded normal operation. The pilot reported that the airplane had been recently fitted with a 4-point inertial reel shoulder harness system and that it is likely that his use of that shoulder harness system prevented him from sustaining a more serious injury.
The weather conditions about the time of the accident were conducive to the accumulation of serious carburetor icing at all power settings. Federal Aviation Administration guidance states that, when conditions are conductive to carburetor icing, the pilot should immediately apply carburetor heat and that the heat should be left on until the pilot is certain that all of the ice has been removed. It is likely that the engine began to lose power due to carburetor ice and that the timely application of carburetor heat would have restored engine power.
Probable Cause: The pilot’s failure to use carburetor heat in cruise flight while operating in an area conducive to serious carburetor icing, which resulted in a loss of engine power and an off-airport landing. Contributing to the accident was the pilot's decision to continue flight toward rising mountainous terrain when the airplane could not maintain altitude.
Accident investigation:
 |
|
Sources:
NTSB
FAA register: http://registry.faa.gov/aircraftinquiry/NNum_Results.aspx?NNumbertxt=6359V
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 11-Sep-2015 16:49 | Geno | Added |
| 11-Sep-2015 17:46 | Geno | Updated [Time, Registration, Cn, Source, Narrative] |
| 13-Sep-2015 07:16 | harro | Updated [Aircraft type] |
| 21-Dec-2016 19:30 | ASN Update Bot | Updated [Time, Damage, Category, Investigating agency] |
| 01-Dec-2017 15:25 | ASN Update Bot | Updated [Other fatalities, Nature, Departure airport, Destination airport, Source, Narrative] |
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