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Constantine's structured design methodology is applied to a real-time (flight) software program. A modified finite-state technique is successfully applied to an operational flight program (OFP) mainloop. Transform and transaction analysis are successfully applied to mainloop tasks. Each technique is demonstrated to show avionics software engineers/contract monitors 'how to get started' on a design. Two hypothetical software modifications illustrate advantages of structured design over the current software implementation. Short and long term effects of structured designed OFPs are briefly described. An OFP familiarization and design methodology is developed for avionics software engineers/contract monitors.