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ASN Wikibase Occurrence # 221706
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Type:Silhouette image of generic EXEC model; specific model in this crash may look slightly different
RotorWay Exec 90
Registration: N716JB
MSN: EXEC-3000
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Location:Caldwell, ID -   United States of America
Phase: Unknown
Departure airport:Caldwell, ID (EUL)
Destination airport:Caldwell, ID (EUL)
Investigating agency: NTSB
Confidence Rating: Accident investigation report completed and information captured
The private pilot was performing hover-taxi maneuvers in the experimental amateur-built helicopter when the engine lost all power, which resulted in a forced landing in a field during which the airplane landed hard. Postaccident examination revealed that the engine had seized due to oil exhaustion after the oil pressure gauge line had failed, causing most of the engine oil to be expelled overboard with an insufficient quantity of oil in the sump for engine operation.
The pilot, who was also the helicopter builder, had installed the oil pressure gauge line, which was made of automotive-grade nylon tubing, about 1 year before the accident. Because the helicopter had an experimental airworthiness certificate and was considered to be an amateur-built aircraft, the pilot could use non-aviation grade components. The pilot discarded the oil line before it could be examined, so its failure mode could not be determined.

Probable Cause: Failure of the oil pressure gauge line, which resulted in oil exhaustion and a total loss of engine power.



Accident investigation:
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year 1 month
Download report: Final report
Other occurrences involving this aircraft

19 Oct 2016 N716JB Private 0 Caldwell, ID sub


Revision history:

10-Feb-2019 10:48 ASN Update Bot Added

Corrections or additions? ... Edit this accident description

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