Northstar Tubine is the manufacturer's representative for RdF Corp. Rdf Corp. manufactures FAA PMA T5 thermocouples for all PT6A engines. RdF Corp's FAA PMA T5 thermocouples are manufactured using technology developed for the space program. This means that RdF Corp.'s FAA PMA T5 thermocouples last one-third longer than OEM T5 thermocouples. For more information visit www.pt6pma.com.