Time Performance Estimation Method for Civil Aircraft ETOPS Time-limited Systems

The time performance of the ETOPS time limited-system is an important input to the aircraft system design, and is a prerequisite to ensure that the aircraft system design meets the maximum ETOPS rerouting capability. Combining ETOPS operational characteristics and the basic concept of aerodynamics, an estimation method of ETOPS time-limited system time performance was proposed, taking into account the aircraft performance, ETOPS diversion distance, speed strategy, reference weight, en-route wind and atmospheric temperature. Case calculations show that the proposed calculation and analysis method can be used for the engineering estimation of the time performance of the ETOPS time limited-system during the aircraft design phase, and provide design input for the time-limited system. At the same time, this method can provide a reference for the verification compliance of the time-limited system.