C-GKFF, a Convair 580F aircraft operated by Kelowna Flightcraft, was conducting flight KFA579 from Vancouver Intl, BC (CYVR) to Kamloops, BC (CYKA). Shortly after the departure from CYVR, the number 2 engine (Allison 501-D13D, s/n CAE500841) RPM began to increase above the normal range. The flight crew contacted ATC and requested vectors back to CYVR. During the return, the RPM began to decrease.
The flight crew performed a precautionary engine shutdown in accordance with the QRH and the operator’s SOPs. The aircraft landed without further incident with ARFF standing by.
The operator’s maintenance replaced the propeller regulator.