ASN logo
ASN Wikibase Occurrence # 214969
Last updated: 17 April 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:14-OCT-1985
Time:09:55
Type:Silhouette image of generic R22 model; specific model in this crash may look slightly different
Robinson R22A
Owner/operator:
Registration: VH-HBQ
C/n / msn:
Fatalities:Fatalities: 0 / Occupants: 2
Other fatalities:0
Aircraft damage: Substantial
Location:5km S of Warooka, SA -   Australia
Phase: Landing
Nature:Ferry/positioning
Departure airport:YWRK
Destination airport:5km S of Warooka, SA
Investigating agency: BASI
Narrative:
The pilot positioned the helicopter on the downwind leg of the circuit at an altitude of about 300 feet above ground level. The wind was gusting between 30 and 35 knots. Towards the end of the downwind leg the pilot noticed that the helicopter was yawing to the right and that a high rate of descent had developed. The pilot applied full power and lowered the collective slightly. The helicopter continued to descend and the pilot applied full up collective, but the helicopter struck the ground heavily and bounced. On the second touchdown, the tail rotor struck the ground and broke off. At the point of turning downwind, the helicopter was being flown at an indicated airspeed of 30 knots. On downwind it is probable that the pilot unwittingly allowed the indicated airspeed to decrease well below translational lift because of the rapid increase in groundspeed, resulting from the 30 knot tailwind. Had the helicopter touched down at zero indicated airspeed, when travelling downwind, it would have contacted the ground at 30 knots groundspeed and travelled a considerable distance along the ground. However, the helicopter travelled only about 12 metres after the first point of touchdown. This indicates that prior to touchdown, the helicopter was probably flying backwards in relation to the airmass in which it was operating, and was effected by the downwash from the main rotor blades. In such a situation there would have been insufficient altitude or power available to arrest the rate of descent.

Sources:

https://www.atsb.gov.au/publications/investigation_reports/1985/aair/aair198500666/
https://www.atsb.gov.au/media/28788/aair198500666.pdf

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


Revision history:

Date/timeContributorUpdates
02-Sep-2018 04:07 Pineapple Added

Corrections or additions? ... Edit this accident description