ASN logo
ASN Wikibase Occurrence # 216350
Last updated: 5 October 2019
This information is added by users of ASN. Neither ASN nor the Flight Safety Foundation are responsible for the completeness or correctness of this information. If you feel this information is incomplete or incorrect, you can submit corrected information.

Date:13-SEP-1986
Time:16:05
Type:Silhouette image of generic R22 model; specific model in this crash may look slightly different
Robinson R22 HP
Owner/operator:
Registration: VH-UXQ
C/n / msn:
Fatalities:Fatalities: 0 / Occupants: 1
Other fatalities:0
Aircraft damage: Substantial
Location:37km NNE of Kalannie, WA -   Australia
Phase: Manoeuvring (airshow, firefighting, ag.ops.)
Nature:Private
Departure airport:Paynes Find, WA
Destination airport:Wongan Hills, WA
Investigating agency: BASI
Narrative:
As the aircraft was cruising at 2500 feet above mean sea level the pilot noticed a vibration in the airframe. He reduced the manifold air pressure setting slightly and the vibration stopped. A short time later the aircraft lost directional control and began to spiral to the right. The pilot was unable to stop the rotation and when the helicopter landed it rolled over. Investigation showed that the lower vertical fin attachment brackets had failed, which caused the fin to separate in flight and strike the tail rotor. The tail rotor assembly and gearbox then completely detached from the tail boom. The fatigue failure of the fin was caused by vibrations emanating from worn components and bearings in the tail rotor and its gearbox. These parts were recently taken from another helicopter and fitted to the subject machine, their previous condition could not be determined. A recent service inspection failed to detect the worn components or the weakened lower fin. The wear in these components was also not noticed during the pre-flight inspections that were carried out between that service and the accident flight.

Sources:

https://www.atsb.gov.au/publications/investigation_reports/1986/aair/aair198600147/
https://www.atsb.gov.au/media/33599/aair198600147.pdf

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


Revision history:

Date/timeContributorUpdates
17-Oct-2018 03:33 Pineapple Added

Corrections or additions? ... Edit this accident description