The current development trend of global civil aviation is the growth of passenger and freight traffic, which entails the consumption of jet fuel. Under these conditions, increasing the efficiency of jet fuel used is of great importance. Global energy consumption is constantly growing, and, first of all, the question of diversification of oil resources arises, resources from which the bulk of motor fuels is produced. Other types of raw energy sources (natural gas, coal, bio-mass) currently account for only a small part. However, an analysis of the development of jet fuels indicates that work is underway to obtain these from other sources of raw materials, especially bio-fuels. Much attention is given to obtaining bio-fuels from renewable sources – such as algae. The issue of the mass transition of civil aviation to alternative fuels is complex and requires the solution of intricate technical as well as economic issues. One of these is the assessment of the impact of new fuels on GTE performance. It is important to give an objective and quick assessment of the use of various types of fuels on the main characteristics of the engine – i.e., throttle and high-speed characteristics. In this case, it is necessary to take into account chemical processes in the chemical composition of new types of fuel. To assess the effect of fuels on the characteristics of a gas turbine engine, it is proposed to use a mathematical model that would take into account the main characteristics of the fuel itself. Therefore, the work proposes a mathematical model for calculating the characteristics of a gas turbine engine taking into account changes in the properties of the fuel itself. A comparison is made of the percentage of a mixture of biofuels and JetA1 kerosene, as well as pure JetA1 and TC-1 kerosene. The calculations, according to the proposed model, are consistent with the obtained characteristics of a gas turbine engine in operation when using JetA1 and TC-1 kerosene. Especially valuable are the obtained characteristics of a gas turbine engine depending on a mixture of biofuel and kerosene. It was found that a mixture of biofuel and kerosene changes the physicochemical characteristics of fuel and affects the change in engine thrust and specific fuel consumption. It is shown that depending on the obtained physicochemical properties of a mixture of biofuel and kerosene, it is possible to increase the fuel efficiency and environmental friendliness of the gas turbine engines used.

The article analyzes the existing problems that impede the effective safety management of the flights of the air forces of the Armed Forces of the Russian Federation. As a result, this analysis revealed the contradiction between the need to build a safety management system and the lack of effective mechanisms for assessing the state of the aviation system and taking into account the influence of the human factor of aviation professionals on flight safety. The contradiction identified the need for developing a set of methods to estimate the actual state of the aviation system protection from the effects of threats associated with the human factor of flight personnel. A methodological apparatus was developed for assessing the security status of an aviation system against hazardous factors, which is based on applying a personality-oriented approach to assessing and managing the state of an aviation system. The method of assessing the state of flight safety allows you to quantify the state of protection of the crew-aircraft system from the impact of hazards caused by the personal factor of a particular pilot before the flight and to assess in near real-time the state of protection of the crew-aircraft system during the flight. The method of assessing the state of safety in aviation formation allows you to assess the status of safety during the organization and conduct of flights, taking into account the influence of the human factor of flight personnel in  near real time.

The article describes the process of collaborative management at airports A-CDM in dynamically changing conditions of the productive process, defined as the occurrence of emergency situations capable of altering the planned actions. In real operation, in this case, a large number of possible solutions for each emergency situation appears, the lower the level of recording for these options, the more their number. This paper focuses on external factors that significantly affect the activities of airlines and airports and to the relevant management retaliation formalized in the form of five points.  The relevance of the choice is dictated by the presence of conflicting interests of stakeholders. Objective explanation in favor of a decision based on the minimization of the total losses from the outbreak of emergencies would significantly strengthen the position of each participant in the process. The authors have introduced a number of mathematical notations and assumptions, a list of which can be supplemented. Dynamic priorities for each participant in the process are formulated. The tool for optimization of joint decision-making is the genetic algorithm, which allows for a smaller number of iterations in the real time to get suboptimal decision that meets the requirements of the participants in the process. As an example, the article describes a situation that may occur in a real-world production. Based on the multiplicative form a dynamic priority for delayed flights is assigned, taking into account the conflicting interests of the participants in the process, private ranking criteria for flights during each step of the rescheduling are formed, a genetic algorithm is applied. As a result, a specific decision of the emergency situation, arising spontaneously from the impact of external factors is obtained. This mathematical apparatus has prospects of introduction into the productive process as any emergency can be built into the solving algorithm and taken into account.

The article analyzes foreign experience and concludes that one of the ways to improve the efficiency of aviation security in the Russian Federation is to use modern network training complexes. A new approach to the assessment of the competence of the aviation security screeners was proposed and tested, that allows to take into account the parameters of the oculomotor activity and heart rate variability of the aviation security screeners being tested, different from the existing approaches using fuzzy classification models. The eye-tracking technology and the device of psychophysiological testing UPFT-1/30 "Psychophysiologist" were used as instruments of psychophysiological monitoring. The basics of automatic generation of fuzzy models such as Sugeno and Mamdani from experimental data are presented. Experimental studies were conducted on the basis of the Ulyanovsk Civil Aviation Institute. The results of the comparison of the generated models showed that the Sugeno model trained with the use of ANFIS-algorithm is more accurate than the Mamdani model and the linear regression model identifies the dependence being studied, according to the competence of aviation security screeners. As a criterion of quality of models on training and test data the average square error is used. The actual problem of choosing an effective concept of noise-resistant coding in the telecommunication component of advanced training complexes is substantiated. The ways of solving the important problem of increasing the reliability of actual digital data in network training complexes based on the use of noise-resistant coding are described. A model of permutation decoder of non-binary redundant code based on lexicographic cognitive map is presented. This model of redundant code decoder uses methods of cognitive data processing in the implementation of the procedure of permutation decoding to effectively protect remote control commands from the influence of destructive factors on the control process.

Research in the field of the developed theoretical and methodological provisions and scientific methods application which have a universal character in the cargo delivery by all means of transport and improving the reliability of transportation by reducing risks in the North of Russia is being carried out. This research corresponds to the "Arctic" program which was adopted by the government of Russia. The application of the modern means of mobile communication, satellite navigation, Geo-informatics, information technology is an important condition for the improvement of economic activities production  management of transport companies involved in the delivery of goods to the Northern regions of Russia. Currently, process management of the cargo transportation to the Northern regions of the Russian Federation is at a low technological level, modern technical means and mathematical methods for optimizing the process are not used, the influence of climatic conditions on the process of Northern delivery goods transportation is poorly studied. On the basis of factor analysis with the use of systematic approach and the method of statistical modeling, measures for reducing risks in the essential goods transportation organization and management which appear in multimodal goods transportation and technological process to the North of Russia according to the requirements of GOST R 51901.1-2002 are determined. This made it possible to increase the reliability of the Northern delivery processes by  10–15 percent. According to the experts of the LLC "Shipping company "Vitim-Les" of Kirensk the developed method of calculating the upper beginning and ending ice phenomena confidence time limit  while planning the transportation of goods of Northern delivery allowed to reduce the transportation time by 10–15%.

The development of multi-rotor helicopter concepts, driven by the active introduction of brushless electric motors, leads to the necessity of assessing the multi-rotor scheme main advantages implementing possibility and determining the rational areas of its application. The article analyzes the concept of a multi-rotor platform with a distributed power plant. Parametric study of characteristics depending on the number of rotors for a line of multi-propeller aircraft with take-off weight from 0.5 to 120 tons was carried out. Evaluation of weight and dimensional characteristics of blades, main rotor heads, gear boxes, as well as power wires of electric motors and structure beams connecting the elements of the distributed power plant is obtained. Evaluation of drag and thrust losses on blowing, as well as power requirements for typical flight modes was carried out. Estimation of the required number of rotors for the implementation of the gearless condition and flight safety with one engine failed are obtained. Rational areas of multi-rotor scheme application are defined.

The article deals with the problems of frequency stabilization of generators in distributed information-measuring systems on the basis of the static frequency stabilization method. The examples of similar systems are given. The necessity to ensure high stability of signal frequency generated by subscribers to improve the efficiency of the stated systems is noted. Two main features of applying the static frequency stabilization method are stated. The first one is determined with a delay in signal input into the device for estimating the frequency-time signal parameters in relation to the signal phase measurement interval. The second feature involves the entry delay of the formed control signal of generator frequency correction. It is shown that the mentioned features lead to divergence of the current variation of generator frequency and the value under correction, obtained considering the delay. The description of information signals enabling to specify a mathematical model of the process of assessment forming of the information signal frequency variation, taking into account the mentioned factors, is offered. It is shown that the possibility of using a statistical method to stabilize the frequency of generators in distributed informationmeasuring systems is determined not only with the values of nominal frequencies and relative instabilities of generators included into the information-measuring system, but also by the autocorrelation function of a random process describing the change of information signal frequency. In case of small time delays between the evaluation of information signal frequency and frequency stabilization, the use of the method to be considered allows to reduce the relative instability of information signal frequency. When time delays are greater than the correlation interval, the use of the statistical method does not lead to the change of relative instability of information signal frequency. Within the correlation interval, the use of the statistical method of frequency stabilization can cause depending on the autocorrelation function values both decrease and increase of the relative information signal frequency instability.

One of the principal criteria of aircraft composite design strength on the conditions of damage tolerance is the minimum defect size of accidental impact damage that is sure to be located during regular maintenance checks. Construction strength with similar (BVID – Barely Visible Impact Damage) and smaller damages must be ensured under design load. The analysis of operational factors affecting the criterion value is conducted in the paper. The effects of personnel qualification, surface color, level of contamination, distance to the object as well as defect size variations during the time due to relaxation of inner strains in the damaged construction were studied.

Research was carried out using 90 carbon fiber three stinger panels of different color and contamination levels which were subject to impact damages by a 25 mm spherical striker. Totally 80 blows were struck when applying energy within the range of 3–107 J. In the visual damage detectability test under different conditions 42 experts were participated including 25 airlines inspectors. For the statistical analysis of empirical data and determination of dependence for the damage detection probability on its size, the Weibull function was utilized. Determination of BVID size using "90/95" criterion was performed by means of the bootstrap method (95% of inspectors must detect not less than 90% of defects with the size not smaller than BVID). The results obtained in this study enabled to access the degree of various operational factors impact on reliability of damage detectability during the visual inspection and determine BVID values depending on the combination of the given factors. In particular, it was demonstrated that from all the viewing distances the defects in polymer composite materials are more detectable on the blue surface than on the gray and red ones. Conducted research demonstrated a significant effect of relaxation (the reduction effect of the surface defect sizes in the composite panel affected by different factors during time span) on the probability of defect detectability during operation. Also water saturation of the construction under excessive temperatures has the critical compared with other factors impact on relaxation of damages in polymer composite materials. The obtained results accord with the data in foreign publications making them more supplement and specific. On the basis of conducted research the entire range of recommendations for aircraft designers and operators utilizing composite constructions is formulated. 

Secure enterprises have Local Area Networks (LANs) that store and process sensitive data that should not be accessed from outside. At the same time, no modern enterprise can successfully function without a LAN which provides the Internet access for the computers of the sales department, technical support service and E-mail server. In order to ensure information security, these two network segments are usually physically isolated from each other by means of exception of any cable interconnections. Enterprises with high demands for server uptime use server virtualization, which requires connecting physical servers to disk storage of virtual server image files. When highly reliable servers are needed only in one of two independent corporate network segments, the cost of creating such a server cluster is reasonable and fast paying off. But when a company encounters the need to place a small but highly reliable server into another network segment, the following problem arises: only server cluster with expensive components can provide the required reliability, but to solve the tasks assigned to the new server, the cluster computing capacity would be too high, and deploying of a cluster would be extremely costly and economically unjustified. On the other hand, the required computing capacity for a new server would be taken from the existing server cluster by creating a new virtual server without any expenses. However, in such case it is necessary to ensure isolation of the new virtual server from the network segment the physical hosts servers are connected to. The article examines the methods of configuring the LAN that allow to isolate virtual and physical servers at the network level. The authors also consider the episode when it is necessary to transfer files between the two computers located in the LAN segments isolated from each other and gives the appropriate solution.

In the early 90s there was a need for the complex development of training, retraining, maintaining and professional development system designed for the most popular Mi-8 helicopter pilots oriented at modern information technologies. The system covers all the stages of pilot training, starting with the initial stages of professional activity up to its completion. The technical means compiling specifications for the whole range training were determined by the results of the pilot in-flight activity analysis. The proposed optimal range of technical facilities for training consists of technical means with different levels of out-of-cockpit and in-cockpit environment simulation. The utilization of these means allows to minimize the expenditures on proficiency level support and cost of pilot training. The set of technical training appliances such as: automated training courses of theoretical disciplines, computer functional and situational simulators, navigation simulators and flight complex simulator includes the facilities that provide training of the pilot actions at each stage of the flight. The individual schedule of computer based self-development classes is drawn up for each student. While compiling the individual schedule logical sequence of all training stages was carefully observed: firstly we begin with a thorough study of helicopter structure, then goes the study of functional system or equipment normal operation, functional system or equipment in special situations operation, and finally, the routine technology of crew operation in normal flight conditions and the crew actions in dangerous and emergency situations. In addition to the direct training of students, the initial stage of training solved the tasks of practical check and improvement of previously taken decisions.