Aviation safety investigations & reports

Hiller UH12-E, VH-PYH, Killarney (31 km ESE Warwick) QLD, 21 December 1988

Investigation number:
198803509
Status: Completed
Investigation completed

Summary

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The pilot was operating the aircraft from the top of a gently sloping ridge in light and variable wind conditions. He lifted the aircraft into a hover one metre above ground level and began to accelerate forward. At about translational lift speed, the helicopter lost height and the tail rotor struck the ground. The pilot was able to land the aircraft straight ahead. Damage was sustained to the tail rotor drive, gearbox, and blades. The pilot had started work at 0445 hours on the day of the accident. He had flown 4.5 hours and had sprayed five chemical loads prior to the accident. This was the first concentrated period of flying he had undertaken in more than three weeks. Also, it was his first early morning start in that time. Both these aspects could have led to the pilot suffering a degree of transient fatigue. This might have been sufficient to cause a slight degradation in his performance sufficient for him not to compensate fully for the nose-up pitch as the helicopter passed through translational lift. This accident was not the subject of an on-site investigation.

Download Final Report
[Download  PDF: 22KB]
 
 
 
General details
Date: 21 December 1988   Investigation status: Completed  
Time: 1030    
Location: Killarney (31 km ESE Warwick)    
State: Queensland   Occurrence type: Collision with terrain  
Release date: 03 February 1989   Occurrence category: Accident  
Report status: Final   Highest injury level: None  

Aircraft details

Aircraft details
Aircraft manufacturer Hiller Aviation  
Aircraft model UH-12  
Aircraft registration VH-PYH  
Serial number N/K  
Type of operation Aerial Work  
Damage to aircraft Substantial  
Departure point Killarney QLD  
Departure time N/A  
Destination Killarney QLD  
Last update 13 May 2014