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ASN Wikibase Occurrence # 213249
Last updated: 27 December 2019
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Date:15-DEC-1984
Time:11:18
Type:Silhouette image of generic H500 model; specific model in this crash may look slightly different
Hughes 369-HS/500C
Owner/operator:
Registration: N9215F
C/n / msn:
Fatalities:Fatalities: 0 / Occupants: 3
Other fatalities:0
Aircraft damage: Substantial
Location:Trinity Inlet, Cairns Harbour, QLD -   Australia
Phase: Landing
Nature:Private
Departure airport:M.V. "Carol Linda", berthed Cairns Harbour, QLD
Destination airport:Green Island, QLD
Investigating agency: BASI
Narrative:
The helicopter, on a sightseeing flight, had completed a circuit of Cairns Harbour before climbing-out towards Green Island. A noise was heard from the rear of the helicopter, accompanied by a rotation to the right. An autorotation was initiated and the helicopter landed on the nearby mudflats. The right skid-legs collapsed on touchdown, which resulted in the helicopter rolling onto its right side. The occupants evacuated and were rescued by a fishing boat. The tail rotor and part of its associated gearbox had separated from the helicopter. The pilot regained directional control when an autorotation was commenced. However,as the helicopter was over water he attempted to carry out a zero forward speed landing, rather than a "run on" type which is the procedure recommended by the manufacturer when loss of tail rotor effectiveness occurs. Thus, when collective pitch was applied to reduce the rate of descent prior to landing, the helicopter again commenced to rotate and touchdown occurred whilst turning to the right. The components which had become detached in flight were not recovered, thus the reason for the failure of the assembly could not be positively determined. However, specialist examinations indicated that the fracture was due to a limited number of high stress cycles, this is not consistent with normal in service loads.

Sources:

https://www.atsb.gov.au/publications/investigation_reports/1984/aair/aair198400054/
https://www.atsb.gov.au/media/27604/aair198400054.pdf

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


Revision history:

Date/timeContributorUpdates
14-Jul-2018 05:00 Pineapple Added

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