(Reuters) -The Federal Aviation Administration issued an alert on Thursday warning that unapproved parts might be installed in certain General Electric model CF6 jet engines, telling owners to inspect planes or inventories for the parts.

The FAA says UK-based AOG Technics sold bushings for GE Model CF6 engines without having FAA approval.

Jet engine maker CFM International said Wednesday thousands of engine components may have been sold with forged paperwork by AOG Technics, including a small number of parts for CF6 engines.

The CF6 is used mainly to power cargo planes, including the vast majority of Boeing 767 freighters.

If unapproved CF6 bushings are found, the FAA said aircraft owners and operators should remove and quarantine parts.

General Electric did not immediately respond to a request for comment.

(Reporting by David Shepardson and Valerie Insinna; Editing by Kirsten Donovan)