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ASN Wikibase Occurrence # 56876
Last updated: 28 March 2020
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Type:Silhouette image of generic AS50 model; specific model in this crash may look slightly different
Eurocopter AS 350BA
Owner/operator:Makani Kai Helicopters
Registration: N141MK
C/n / msn: 2424
Fatalities:Fatalities: 0 / Occupants: 2
Aircraft damage: Substantial
Location:Wiliwili Nui Ridge, 10 miles from Honolulu, Hawaii -   United States of America
Phase: Landing
Departure airport:Honolulu, HI (HNL)
Destination airport:Honolulu, HI
Investigating agency: NTSB
The purpose of the flight was to transport a worker to an antenna located on a ridge top at an elevation of about 2,400 feet. The pilot reported that the flight to the location was uneventful and that he completed his prelanding checklist and noted nothing abnormal. Just prior to landing, there was a loss of engine power. According to the pilot, “the engine felt and sounded like it was winding down and rotor RPM was starting to bleed off.” At this point the helicopter was less than 10 feet from the landing site and was not holding altitude. The pilot maneuvered the helicopter so that it touched down and rolled over onto its right side, which prevented the helicopter from falling down the steep slope of the ridge. After the helicopter came to rest, the pilot shut down the engine. Examination of the helicopter revealed no discrepancies with the fuel system. Engine continuity was established. A pneumatic leak check was performed and leaks were identified at the temperature compensator and at the PX acceleration bellows. A test cell run of the engine was completed without tightening any of the pneumatic fittings. During the test cell run, the engine achieved maximum continuous, takeoff, and thermodynamic shaft horsepower. The engine did not surge during transient deceleration and acceleration runs, and was responsive to commanded throttle inputs. No preexisting condition was identified on the engine that would have interfered with normal operation or explain the reported loss of engine power.
Probable Cause: The partial loss of engine power during landing for an undetermined reason.


FAA register: 2.


(c) NTSB

Revision history:

06-Jan-2009 10:07 harro Updated
23-Jun-2009 11:53 harro Updated
21-Jul-2014 01:11 Dr. John Smith Updated [Time, Location, Nature, Departure airport, Source, Narrative]
21-Dec-2016 19:25 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]
01-Dec-2017 11:39 ASN Update Bot Updated [Other fatalities, Departure airport, Destination airport, Source, Narrative]

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