Time-Limited Dispatch (TLD) Technology And Airworthiness Certification Of Research For Aviation Engine FADEC System

The Time-Limited Dispatch technology is not only to meet the practical needs of the civil aviation industry to ensure profitability based on safety,but also an important airworthiness verification link for aviation engines.The full authority digital electronic engine control system is implemented by the electronic control system to achieve all functions of control for the engine operation under all conditions.It has features such as high integration,high reliability,and dynamic systems.The establishment of TLD airworthiness certification system has a important role in promoting the development of domestic civil aviation engines and the improvement of civil aviation certification capacity.This article expounds the legal basis of TLD technology through the interpretation of the actual needs of airlines and the limitations of civil aviation airworthiness regulations.It systematically analyzes the components and system functions of TLD technology applied by FADEC system,describes the functional characteristics and system structure of the control system in detail,establishes a fault information database of the control system,and determines the application basis of TLD technology.Secondly,the control system reliability model is simulated using single fault and multiple fault models under TLD analysis.Through the application of airworthiness compliance verification analysis methods,the trend of reliability changes with dispatch time caused by TLD analysis system fault conditions is predicted.Comparative analysis of Markov method and Monte Carlo method under multiple faults verifies that Monte Carlo simulation under multiple fault conditions can solve the state space explosion problem.When the system reliability model is optimized,the system reliability level also changes,and component reduction can effectively improve the system reliability level.Then,a system theory based reliability model for control systems is established by combining the system theory process method with the optimized Monte Carlo method.A safety analysis of TLD airworthiness compliance is established from the perspective of unsafe control behavior.Compared with traditional safety methods,the error is within an acceptable range,proving that the new safety analysis method is acceptable in airworthiness recommendations.Establish an ETOPS method during airworthiness compliance analysis to ensure that the system security can still meet the requirements for the safe landing of the aircraft to the designated airport in the event of TLD failure,forming a redundancy utilization strategy centered on TLD technology,and using ETOPS as the system airworthiness security guarantee.Finally,make analysis and suggestions for establishing a complete TLD airworthiness system,and form a joint airworthiness support system with manufacturers,carriers,and civil aviation authorities.The STPA method is introduced to expand the TLD airworthiness system,and deeply interpreting airworthiness regulations and regulations to form a systematic leading indicator,which limits the occurrence rate of system loss of thrust control events to 10 to 5,and completes airworthiness certification and supervision throughout the entire lifecycle of the FADEC system.The research results of this article can provide some suggestions for the technical application and airworthiness certification of civil aviation engines,and have potential roles in meeting the operational requirements of domestic large aircraft and promoting the improvement of international airworthiness certification capabilities of aviation engines.