Aviation safety investigations & reports

Technical assistance to Australian Helicopter Industry Association in the examination of components relating to Lycoming engine failures

Investigation number:
Status: Active
Investigation in progress


In mid-2018, the Northern Fuels Stake Holders Investigation Group was formed in response to a large number of reported engine cylinder exhaust valve issues on Lycoming engines in northern Australia.

The Australian Helicopter Industry Association is a member of the investigation group, and approached the ATSB seeking assistance with respect to this matter. The ATSB has undertaken to assist with component examinations that may help to identify factors contributing to the engine issues. To facilitate this work, the ATSB has initiated an external investigation under the Transport Safety Investigation Act 2003.

In addition, the Civil Aviation Safety Authority (CASA) released Airworthiness Bulletin AWB 85-024 on 2 August 2018, advising of the increasing incidence of premature exhaust valve and valve guide wear that could ultimately lead to partial or complete engine failure. The AWB includes some additional background information and recommendations. Enquiries relating to the AWB can be directed to CASA at AirworthinessBulletin@casa.gov.au


General details
Date: 14 November 2018   Investigation status: Active  
  Investigation level: Defined - click for an explanation of investigation levels  
Location: Northern Australia    
State: Other    
Report status: Pending    
Last update 04 January 2019