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ASN Wikibase Occurrence # 211518
Last updated: 6 December 2019
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Date:25-NOV-1999
Time:14:34
Type:Silhouette image of generic R44 model; specific model in this crash may look slightly different
Robinson R44
Owner/operator:Heli Scenic Flights & Training Pty Ltd
Registration: VH-STO
C/n / msn: 0369
Fatalities:Fatalities: 0 / Occupants: 4
Other fatalities:0
Aircraft damage: Written off (damaged beyond repair)
Location:41km NE of Hayman Island, Queensland -   Australia
Phase: Landing
Nature:Domestic Non Scheduled Passenger
Departure airport:Hayman Island, QLD
Destination airport:Reef World, QLD
Narrative:
The float fitted Robinson R44 helicopter was being used to conduct a charter flight from Hayman Island to Reef World. The pilot reported that about 20 minutes after takeoff, he noticed a burning smell, felt a slight shudder closely followed by the helicopter's clutch light dimly flickering. The pilot conducted a powered descent, transmitted Mayday calls and landed the helicopter in the water with minimal impact forces. The helicopter sustained damage to its aft cowling. The pilot and passengers were unhurt.

Examination of the helicopter revealed that the fan shaft bearing located on the fan shaft between the engine and the cooling fan had overheated, melted and seized.

The fan shaft had fractured just forward of the bearing. The fan shaft bearing is the lower actuator bearing of the clutch actuator assembly. The clutch actuator had fractured with the bottom half departing the aircraft. The sheave and tail rotor drive shaft were damaged by the V-belts. The engine had extensive overspeed damage and had moved off the aft mount. The upper frame was bent near the engine and the aft cowling was damaged as a result of excessive engine vibration and contact with separating components. The rocker assemblies on several cylinder heads were pushed through the rocker covers indicating the severity of the engine overspeed.

Sources:

1. https://www.atsb.gov.au/publications/investigation_reports/1999/aair/aair199905646/
2. https://www.regosearch.com/aircraft/au/STO


Revision history:

Date/timeContributorUpdates
27-May-2018 12:37 Pineapple Added
30-Oct-2018 20:22 Dr.John Smith Updated [Operator, Total occupants, Location, Source]

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