The warning follows the July 4 crash of an R44 in Broome, Western Australia.
Pilots of Robinson R44s should land as soon as possible if they sense unusual vibrations through the tail rotor pedals, the Australian Transport Safety Bureau (ATSB) says.
The Bell 206B pilot knew of the engine problem before takeoff, the TSB says.
The board cited a June accident involving separation of a tail boom during a sightseeing flight in Hawaii.
2010 FSF Press Releases, Accident Investigation, Helicopter Safety, News
The TSB cited a weak steel pin in the fatal crash tied to the separation of a Bell 212’s rotor blades and assembly.
