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The pilot intended to land on a small knoll in the centre of a large cleared area in heavily timbered country. During the flare to land over a large depression, the pilot noticed a lack of power accompanied by the Low Rotor RPM Warning Horn. He lowered the collective control and wound the throttle to maximum in an attempt to regain rotor RPM. In doing so, he oversped the engine and rotor, and subsequently overshot the landing site. He was convinced that he had a genuine power problem and elected to land in a gully beyond the knoll. The tail rotor struck ground in the steeply sloping gully, resulting in the tailboom being cut off by the main rotor. The cabin came to rest on a heap of storm debris. During later investigation, the engine was ground run successfully. A small fuel leak existed at the carburettor but this did not affect the fuel supply to the engine. The pilot had not received any training in ridge line operations. He had made his approach using visual cues only, which can result in a steep final approach accompanied by a high rate of closure. In addition, the pilot was unaware of the local wind velocity, and the aircraft was probably subject to local airflow effects. While attempting to compensate for these, it is probable that the pilot over-pitched the main rotor blades leading to a temporary reduction in main rotor RPM. He subsequently misread the symptoms as an engine malfunction.

Download Final Report
[ Download PDF: 23KB]
 
 
 
 
General details
Date: 24 June 1989 Investigation status: Completed 
Time: 900 Investigation type: Occurrence Investigation 
Location:16km NE of Kilcoy Occurrence type:Runway excursion 
State: Queensland Occurrence class: Operational 
Release date: 21 February 1990 Occurrence category: Accident 
Report status: Final Highest injury level: None 
 
Aircraft details
Aircraft manufacturer: Robinson Helicopter Co 
Aircraft model: R22 
Aircraft registration: VH-HBE 
Serial number: 509 
Type of operation: Private 
Sector: Helicopter 
Damage to aircraft: Substantial 
Departure point:14km NE of Kilcoy QLD
Departure time:0850
Destination:16km NE of Kilcoy QLD
 
 
 
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