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ASN Wikibase Occurrence # 141139
Last updated: 22 September 2019
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Date:01-JAN-2012
Time:12:11
Type:Seastar XP
Owner/operator:Private
Registration: N667JH
C/n / msn: 133
Fatalities:Fatalities: 0 / Occupants: 1
Aircraft damage: Substantial
Category:Accident
Location:Willimantic Reservoir, Willimantic, CT -   United States of America
Phase: Initial climb
Nature:Private
Departure airport:Willimantic, CT (IJD)
Destination airport:Willimantic, CT (IJD)
Investigating agency: NTSB
Narrative:
Before the experimental, amateur-built, amphibious biplane's first test flight, the pilot/owner/builder ran the engine for about 20 minutes. He then taxied to the runway and departed. He flew for about 25 minutes before returning to the airport. After landing, he then taxied back to the runway, departed, circled the field for an additional 20 minutes, then returned to perform a touch-and-go landing. After touching down, adding power, and beginning the initial climb, the engine lost partial power and the engine's rpm decreased to about 3,000 rpm. Because the airplane was past the departure end of the runway, the pilot performed a water landing on a nearby reservoir. During the landing, the left lower wing struck the water and separated from its mounting location. After the airplane slowed, the pilot noticed that the engine was still running; however, when he advanced the throttle, the rpm would initially increase and then immediately decrease to 2,000 rpm. Examination of the airplane and engine revealed no mechanical failure or malfunction that would have precluded normal operation. It was further noted that the engine was not equipped with a carburetor heat system or insulated fuel hoses, as recommended by the engine manufacturer. Due to the ambient air temperature at the time of the accident, it was improbable that vapor lock caused the partial loss of power. Review of a carburetor icing probability chart revealed that weather conditions were conducive for serious carburetor icing. Therefore, it is likely that had a carburetor heat system been installed and the pilot had applied carburetor heat before his initial power reduction, the formation of carburetor ice would have been prevented.
Probable Cause: A partial loss of engine power due to carburetor icing. Contributing to the accident was the lack of an installed manufacturer-recommended carburetor heat system.

Sources:

NTSB: https://www.ntsb.gov/_layouts/ntsb.aviation/brief.aspx?ev_id=20120102X93914&key=1


Revision history:

Date/timeContributorUpdates
01-Jan-2012 14:22 RobertMB Added
01-Jan-2012 14:23 RobertMB Updated [Date]
01-Jan-2012 17:58 RobertMB Updated [Time, Aircraft type, Registration, Cn, Location, Source, Damage, Narrative]
19-Jan-2012 09:56 Geno Updated [Time, Location, Source, Damage, Narrative]
21-Dec-2016 19:26 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
27-Nov-2017 17:52 ASN Update Bot Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative]

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