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ASN Wikibase Occurrence # 36706
Last updated: 5 July 2020
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Type:Silhouette image of generic H500 model; specific model in this crash may look slightly different
Hughes 369D
Registration: N5105N
C/n / msn: 911055D
Fatalities:Fatalities: 2 / Occupants: 4
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:Puako, HI -   United States of America
Phase: En route
Departure airport:Mano Point, HI
Destination airport:Waimea-Kohala, HI (MUE)
Investigating agency: NTSB
The helicopter was cruising at low level when the engine failed. The pilot turned toward a landing area and entered an autorotation with a quartering tailwind. During the autorotation, the helicopter continued to descend, remaining in a nose low attitude, until striking the ground. Impact occurred on up sloping terrain, and the helicopter was damaged. A computation of the weight and balance revealed the helicopter's moment arm exceeded the forward CG limit by about one inch, and limited aft cyclic control. An examination of the engine revealed that a stator vane had failed due to excessive erosion and fatigue cracking. The condition had not been detected during a compressor case erosion inspection, 60 flight hours before the accident. CAUSE: erosion of second stage stator vanes, inadequate maintenance inspection for the erosion, and subsequent fatigue failure of a stator vane, which resulted in loss of engine power and a forced landing on mountainous/hilly terrain. Also causal was: the pilot's loading of the aircraft in such a manner that exceeded the forward CG limit, which resulted in his failure (or inability) to properly flare the helicopter during a forced autorotation and landing. The rising terrain and tailwind condition for landing were related factors.



Revision history:

24-Oct-2008 10:30 ASN archive Added
21-Dec-2016 19:23 ASN Update Bot Updated [Time, Damage, Category, Investigating agency]

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