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Icing the cause of 2016 plane crash off Makaha, report finds

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    Carburetor icing was the cause of engine power loss during a May 2016 interisland flight that crashed in waters off Makaha.


    The Beechcraft Sundowner that made an emergency ocean landing off Makaha Beach Park was pulled out of 15 to 20 feet of water.

The National Transportation Safety Board has determined carburetor icing as the cause of engine power loss during a May 2016 interisland flight where the pilot of a Beechcraft Sundowner was forced to ditch his plane into the ocean off Makaha.

The final report recently released by the NTSB also said the pilot’s delay to apply carburetor heat during their flight to Oahu from Kauai “while operating in an area conducive to carburetor icing” was a contributing factor.

On May 23, Eric Kawamoto and his wife, Leslie were heading back to Oahu after attending a friend’s wedding on Kauai when the engine began to run rough during the climb-to-cruise portion of the flight.

Kawamoto applied carburetor heat which resolved the roughness and he continued with the flight.

As the plane approached Oahu, the NTSB report said the engine began to run roughly again in addition to a significant loss of engine rpm (revolutions per minute). “The pilot applied carburetor heat and adjusted the mixture, but the engine power was not restored.”

Kawamoto, a Navy electrical engineer who has about 10 years of experience flying small, single-engine planes, initiated a forced landing into the ocean, approximately 50 to 75 feet off Makaha.

The couple got out of the plane and started swimming while wearing life vests. Lifeguards spotted the plane’s tail protruding from the water’s surface and rescued the Kawamotos who sustained minor injuries in the forced landing.

The NTSB report said weather conditions at the time of the accident “were conducive to the formation of carburetor icing at glide and cruise power and serious carburetor icing at glide power. If the pilot had either kept the carburetor heat on or applied it earlier, the loss of engine power and subsequent ditching could have been avoided.”

NTSB report on 2016 Makaha plane crash by Honolulu Star-Advertiser on Scribd

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