Aviation safety investigations & reports

Winching event involving Sikorsky S92A, VH-IPE, near Broome, Western Australia, on 26 August 2017

Investigation number:
Status: Completed
Investigation completed


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On 26 August 2017, at about 1100 Western Standard Time, the crew of a Sikorsky S-92A helicopter, registered VH-IPE, were undertaking a winching exercise to a vessel offshore, near Broome, Western Australia. During the exercise, a fracture of the hi-line weak-link resulted in a near contact of the winch hook with the helicopter main rotor. There were no injuries and the helicopter was not damaged.

The crew completed an incident debrief clear of the vessel and elected to complete the flight with open water winching and discontinue further use of the hi-line. The flight was completed and the helicopter returned to Broome without further incident.

The ATSB found that the fracture of the hi-line weak-link and subsequent trajectory of the winch hook was the result of the temporary restriction in the line, which occurred while the helicopter was moving clear of the vessel transfer point. The operator had implemented a change management process for the introduction of the search and rescue capability, but this did not include risk assessments of the role equipment to be used.

As a result of this serious incident, the operator implemented management of change processes for their role equipment, appointed experienced personnel to new search and rescue management positions, and completed an internal and external review of their documentation and procedures.

Hi-line with weak-link and carabiner (left) and fractured weak-link (right)
Hi-line with weak-link and carabiner (left) and fractured weak-link (right)

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General details
Date: 26 August 2017   Investigation status: Completed  
Time: 1100 WST   Investigation level: Short - click for an explanation of investigation levels  
Location   (show map): near Broome    
State: Western Australia   Occurrence type: Miscellaneous - Other  
Release date: 19 January 2018   Occurrence category: Serious Incident  
Report status: Final   Highest injury level: None  

Aircraft details

Aircraft details
Aircraft manufacturer Sikorsky Aircraft  
Aircraft model S92A  
Aircraft registration VH-IPE  
Serial number 920038  
Operator HNZ Australia  
Type of operation Aerial Work  
Sector Helicopter  
Damage to aircraft Nil  
Departure point Broome, WA  
Destination Broome, WA  
Last update 14 November 2018