ASN Wikibase Occurrence # 295758
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| Date: | Saturday 7 June 2003 |
| Time: | 08:45 LT |
| Type: |  Cessna 172H Skyhawk |
| Owner/operator: | Private |
| Registration: | N2786L |
| MSN: | 172-55986 |
| Total airframe hrs: | 4010 hours |
| Engine model: | Continental O-300D |
| Fatalities: | Fatalities: 0 / Occupants: 1 |
| Aircraft damage: | Substantial |
| Category: | Accident |
| Location: | Glasgow, MT -
 United States of America
|
| Phase: | Unknown |
| Nature: | Private |
| Departure airport: | Ione, WA (S23) |
| Glasgow International Airport, MT (GGW/KGGW) | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
The pilot of the carburetor equipped Cessna 172H was approximately 9 nautical miles west of his first fuel stop and commenced a let down through a hole in a broken cloud layer. The surface weather observation at his intended destination recorded several minutes after the accident reported two broken cloud layers at 2,600 feet and 3,400 feet, an overcast cloud layer at 7,000 feet, and temperature 53 degrees F. and dew point 45 degrees F. He reported applying carburetor heat and reducing engine RPM, and then having to descend faster and reduce engine RPM further. He continued a "gliding" descent to 4,000 feet and then re-applied power with no effect. He then executed a forced landing to a muddy, wet agricultural field during which the nose gear collapsed and the aircraft nosed over. FAA Advisory Circular 61-23B, "Pilot's Handbook of Aeronautical Knowledge," provides guidance for operations in carburetor icing conditions. Specifically, the reference states in part "... carburetor heat should be turned to "full-on" before closing the throttle, and left on during the closed-throttle operation...." and "...Periodically, however, the throttle should be opened smoothly for a few seconds to keep the engine warm, otherwise the carburetor heater may not provide enough heat to prevent icing...."
Probable Cause: A loss of engine power due to carburetor icing. Contributing factors were carburetor icing conditions and the muddy, wet terrain at the landing site.
Accident investigation:
 |
|
Sources:
NTSB SEA03LA097
Location
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 13-Oct-2022 12:34 | ASN Update Bot | Added |
| 12-Sep-2023 20:20 | Ron Averes | Updated |
Corrections or additions? ... Edit this accident description
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