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ASN Wikibase Occurrence # 189151
Last updated: 18 May 2019
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Type:Silhouette image of generic RV4 model; specific model in this crash may look slightly different
Van's RV-4
Registration: N924WZ
C/n / msn: 3218
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Location:SW Shelby County, IN -   United States of America
Phase: Take off
Departure airport:Frankfort, KY (FFT)
Destination airport:Shelbyville, KY (3KY9)
Investigating agency: NTSB
Following several uneventful touch-and-go-landings, the private pilot refueled the airplane and returned to his home airport. During the approach for landing, the pilot saw wildlife on the runway, so he conducted a low pass over the runway; however, when he applied full throttle to climb, the engine did not produce full power. The pilot continued to climb the airplane with the intention of staying in the airport traffic pattern and making a full stop landing. Continuing through the pattern, he applied carburetor heat, then turned it off again. The airplane began sinking fast on final approach and impacted terrain short of the runway, resulting in substantial damage. A postaccident examination of the engine revealed no evidence of mechanical malfunctions or failures that would have precluded normal operation.
The atmospheric conditions at the time of the accident were conducive to serious carburetor icing at glide power settings. After observing the loss of engine power during the climb out from the low approach, the pilot applied carburetor heat briefly, then, due to low altitude and sink rate, he turned off the carburetor heat to reduce the loss of power. It is likely that the carburetor accumulated ice during the low approach, which resulted in the observed partial loss of engine power, and the brief application of carburetor heat was insufficient to clear the ice from the carburetor and restore engine power.

Probable Cause: The partial loss of engine power due to carburetor icing. Contributing to the accident was the pilotís failure to effectively use carburetor heat.


FAA register:

Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 2 years 1 month
Download report: Final report


Photo: FAA

Revision history:

08-Aug-2016 10:16 Iceman 29 Added
08-Aug-2016 15:10 Aerossurance Updated [Time, Aircraft type, Operator, Total fatalities, Total occupants, Other fatalities, Location, Source, Narrative]
08-Aug-2016 19:34 Geno Updated [Aircraft type, Registration, Cn, Phase, Nature, Departure airport, Source, Damage]
09-Aug-2016 07:27 junior sjc Updated [Aircraft type, Narrative]
16-Sep-2018 19:10 ASN Update Bot Updated [Time, Nature, Departure airport, Destination airport, Source, Narrative, Accident report, ]
17-Sep-2018 18:53 harro Updated [Source, Narrative, Photo]

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