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The article deals with procedural guidelines for delayed damage aircraft safe flights. This methodological support is intended to form the aircraft type minimum equipment list (MEL).It is suggested to use airworthiness provision as the basic criterion for MEL determination. In order to develop methodological support of safe flights with delayed damage it is suggested to follow the well-known methods of statistical and constructive analyses and theory of estimation methods. Functional system reliability of delayed damage flights isanalyzed alongside with functional system failure types and consequences.Modeling reckons upon the opportunity to analyze the functional system failure-free operation for any predetermined specified operation time, including the time between overhauls. Functional system failure-free operation analyses and estima- tion by means of suggested model supposes step-by-step approach in solvation of the following problems: every component of the functional system reliability estimation; failure-free operation of the functional system in the whole.Thus it is possible to determine and forecast acceptable rates of failure probability for every analyzed component considering airworthiness requirements at the aircraft maintenance facility.The initial data for modeling is the functional systems and parts failure statistic database accumulated from a cer- tain maintenance facility operation experience.The suggested mathematical support for MEL formation allows to update manufacturer specified MEL for the air-craft maintenance facility.

The article deals with the estimation algorithm for functional system reliability influence on the aircraft technical maintenance. The research results which allow to estimate the functional system reliability influence on the aircraft technical maintenance process are provided. The aircraft maintenance process effectiveness implies the maintenance procedures including pre-flight preparation, the flight itself, technical maintenance and storage.The research was aimed at forecasting the aircraft technical maintenance process considering the functional system reliability, with special attention payed to failure-free operation. The term failure-free operation stands for the ability to execute a required function within a given time interval at given conditions.The objects of maintenance -aircraft functional systems and their components have a great degree of failure-free operation, which has been a design requirement and is supported at aircraft maintenance and operation. Failures and malfunctions are seldom events. This fact leads to a limited statistic maintenance surveillance database. Classical methods of statistical analyses do not provide the sufficient fiducial probability for functional system failure-free operation estimation. Thus these methods do not allow to estimate its influence on the aircraft technical maintenance process effectiveness.In order to solve this problem it is suggested to use the method of flow diagrams and random sample statistical method for failure-free operation estimation-statistical modeling (Monte-Carlo Method). Reliability flow diagram method allowed to determine the functional system failure-free operation random sample dependence on the technical maintenance frequency.The initial data were: the functional system flow diagram, the list of the main equipment, functional system equipment failure random sample data. The use of statistical modeling allowed to estimate the dependence of functional system reliability (failure-free operation) on the technical maintenance frequency for expanded statistical database (a number of functional system maintenance and operation procedures).

The article describes a method of statistical modelling form the required amount of spare resource by the criterion of performance assurance of aircraft functionale systems for a long term operation. The calculations and the results of the statistical modelling are given.

The method of forming the complete set of spare parts, including optimization according to the criterion of its sufficiency, to ensure the regularity of flights of civil aircraft is dealt with in the article.