Rex's run of bad luck has continued with a flight bound for Sydney forced to return to Dubbo after the crew shut down an engine due to a high-temperature reading.
The Regional Express Saab 340 - carrying 23 passengers - made a safe emergency landing after 10am on Thursday.
Civil Aviation Safety Authority spokesman Peter Gibson told AAP the right-hand engine issue was "totally unrelated" to the plane's propeller assembly.
The right-hand propeller of a similar aircraft fell off Regional Express's Albury to Sydney flight last week after the engine was shut down following "abnormal indications".
Mr Gibson said during Thursday's flight the crew "had an indication of high engine temperature on the right-hand engine so it was shut down and they returned to Dubbo".