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Preliminary

Summary

Preliminary report released 10 April 2006

On 21 February 2006, at approximately 0630 Eastern Standard Time, a Robinson Helicopter Company Model R44 helicopter (R44), registered VH-HBS, departed Mt Isa, Qld, with two people on board. The helicopter was to position to the Gunpowder airstrip (approximately 100 km to the north) to meet a survey party.

Upon arrival at the airstrip, two other people boarded the helicopter and it departed to begin survey operations in the area between Mt Gordon Mine and Mt Kelly Mine, approximately 30 km to the south-west (Figure 1). During the morning, the helicopter returned to the airstrip at Gunpowder on three occasions to refuel and change personnel on board. It was reported that the helicopter was refuelled to full tanks on each occasion.

Figure 1: Survey area and accident location

figure 1

It was reported that the helicopter refuelled for the last time at approximately 1300 and departed shortly after with four people on board to continue survey operations in the designated area. The helicopter was expected to rendezvous with the other members of the survey team at approximately 1530. When the helicopter failed to arrive, communication checks with the helicopter pilot and the helicopter operator were conducted and, when no contact with the helicopter was established, search and rescue procedures were initiated. The search continued into the night using a forward looking infrared (FLIR) equipped aircraft. The following morning additional helicopters and aircraft joined the search. At approximately 1100, the burnt wreckage of the helicopter was located on the top of a hill, situated on the edge of the survey area. Rescuers confirmed that all four persons on board had received fatal injuries.

Examination of the wreckage indicated that the helicopter had impacted the terrain heavily, approximately rotor-disc level and in a nose-down attitude. The helicopter came to rest on its right side (Figure 2). The main and tail rotor blades displayed evidence of low rotational energy at the point of impact. Further examination of the main rotor blades revealed compression wrinkling of the upper outer surface of both main rotor blades. All components of the helicopter were accounted for at the accident site.

Figure 2: Aerial view of helicopter wreckage

Figure 2

A severe, fuel-fed, post-impact fire destroyed the cabin and cockpit structure and surrounding flight and engine control systems. The fixed emergency locator transmitter (ELT) and the satellite telephone carried by the pilot were destroyed in the fire. No evidence of the portable ELT, reported to have been carried by the pilot, was found in the wreckage.

The area in which the helicopter was located was not considered to be suitable for a landing area for the R44 helicopter.

Weather conditions in the area were forecast to be fine with light easterly winds. Reported weather conditions in the area were consistent with that forecast.

The pilot held a commercial pilot (helicopter) licence and was appropriately endorsed to fly the R44 helicopter.

The ATSB has recovered the engine and a number of other components for further examination. One of the components recovered is an impact and fire damaged Global Positioning System (GPS) unit. A quantity of data has been successfully recovered from the GPS unit.

The investigation is continuing and will include:

  • detailed examination of the engine and recovered components
  • examination of the helicopter maintenance records
  • further evaluation of the weather conditions
  • a review of operational factors
  • detailed examination of recovered GPS data.
 
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