The Electrical Control Unit in the F/A-18 Hornet aircraft is field- replaceable but suitable test equipment for this unit is not available in Australia. Both the United States Navy and the Canadian Defense Forces, which also operate the Hornet aircraft, concede deficiencies in flight-line test facilities for this unit and various proposals have been put forward to rectify the situation. The main purpose of the visit to USA and Canada was to analyse these proposals and advise the Royal Australian Air Force of the potential of each proposal to meet Australian service requirements. During the visit the opportunity was taken to present three papers on ARL research at conferences in the USA, and to discuss future trends in gas turbine controls. Keywords: Jet fighters; Aircraft maintenance; Turbofan engines; Failure analysis; Diagnostic equipment; Onboard data processing; Helicopter condition monitoring; Digital control; Small gas turbines.