ASN Wikibase Occurrence # 284405
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| Date: | Saturday 18 August 2007 |
| Time: | 09:45 LT |
| Type: |  Piper J3C-65 Cub |
| Owner/operator: | Private |
| Registration: | N98875 |
| MSN: | 19135 |
| Engine model: | Lycoming O-235 |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Big Lake, Alaska -
 United States of America
|
| Phase: | Unknown |
| Nature: | Training |
| Departure airport: | Anchorage, AK (Z41) |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The local instructional flight was on an extended, low power descending approach to a remote airstrip when the engine lost power. Remedial actions to restore engine power, including pulling the carburetor heat on, did not restore engine power. The flight instructor seated in the rear seat of the tandem, two seat airplane, realized the airplane was too low to reach the airstrip, and he took the controls from the front seat pilot. The instructor made an off-airport emergency landing in soft terrain, and the airplane nosed over. Postaccident inspection disclosed ample fuel and no preimpact mechanical problems. The front seat pilot related that he did not have the carburetor heat on until the loss of engine power occurred, and the instructor told him to turn it on. He also said that there were low, wispy clouds in the area. A local weather report indicated that the temperature was 57F, and the dew point was 52F. When these values are entered into a carburetor icing probability chart, the results are in the "Serious Icing" category. Carburetor ice likely formed inside the carburetor, which resulted in the loss of engine power. Carburetor heat becomes ineffective once the engine has lost power.
Probable Cause: The flight instructor's delayed instructions to apply the carburetor heat, and his inadequate supervision. A factor contributing to the accident was carburetor icing conditions.
Accident investigation:
 |
|
Sources:
NTSB ANC07LA088
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 30-Sep-2022 16:16 | ASN Update Bot | Added |
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