Maintenance and Modifications
Australian Avgas Switch Tied To Robinson Engine Issues There
A new study by the Australia Helicopter Industry Association ties reformulated avgas to rash of piston helicopter engine problems there.

A change in the formulation of avgas delivered to Northern Australia is suspected of causing widespread and significant engine maintenance events in the fleet of hundreds of Lycoming-powered Robinson helicopters based there, according to a study published the Australia Helicopter Industry Association (AHIA). The problem is being linked to the failure of more than 2,000 engine cylinder barrels on Australia-based Robinson R22s and R44s since 2013. Some cylinders failed within the first 100 hours in service.