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ASN Wikibase Occurrence # 214964
Last updated: 21 November 2019
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Date:09-OCT-1985
Time:14:05
Type:Silhouette image of generic UH12 model; specific model in this crash may look slightly different
Hiller UH-12E
Owner/operator:
Registration: VH-AGL
C/n / msn:
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:Cape Portland, TAS -   Australia
Phase: Landing
Nature:Agricultural
Departure airport:9km S of Cape Portland, TAS
Destination airport:Rushy Lagoon Homestead, TAS
Investigating agency: BASI
Narrative:
The pilot reported that while he was hovering the helicopter at about 25 feet above ground level, the engine suddenly lost power. He placed the helicopter in an autorotation but maintained the throttle setting that had been set while the aircraft was hovering. Just as the skids were about to contact the bushes, the engine momentarily regained power. The helicopter impacted the ground on its right hand side and fire broke out. Both the occupants escaped from the helicopter before it was destroyed by fire. An examination of the engine revealed that both valves in one cylinder had been striking the top of the piston, and the inlet valve was badly chipped. It was likely that when the inlet valve failed, a flashback occurred in the induction system, resulting in a complete loss of engine power. The engine regained power momentarily when the mixture build-up again reached a combustible level. Had the pilot closed the throttle when the engine initially failed, the sudden power surge should not have affected his ability to control the autorotation.

Sources:

https://www.atsb.gov.au/publications/investigation_reports/1985/aair/aair198501403/
https://www.atsb.gov.au/media/28772/aair198501403.pdf

Accident investigation:
cover
  
Investigating agency: BASI
Status: Investigation completed
Duration:
Download report: Final report


Revision history:

Date/timeContributorUpdates
02-Sep-2018 02:52 Pineapple Added

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