Domestic Aircraft Research Articles

Research on the meteorological data transmission system of civil aircraft based on BeiDou satellite

Abstract With the official opening of the Beidou-3 global satellite navigation system, Beidou has entered a new era of global services, extending its service area to the whole world. With the advantages of sufficient data volume and high data security, the BeiDou-3 short message satellite communication system can provide global communication services for airlines, realize two-way data transmission between air and land, and effectively reduce the operating costs of airline companies. Aiming at the demand for low-cost civil aircraft weather data transmission proposed by domestic and foreign airline companies, the current development of civil aviation weather information transmission and the current application status of BeiDou in civil aviation were studied, and the BeiDou satellite-based civil aircraft weather data transmission system was designed. The system architecture, detailed functions and data transmission workflow were analyzed, and the message coding structure was designed using bit-based coding technology. Finally, the feasibility of the scheme is verified through the data demand analysis of weather news and the onboard flight test on a domestic aircraft. The results show that t-he BeiDou short message function has the ability to realize the weather data transmission of a civilian aircraft.

Research on cabin VOC controlling of civil aircraft

Abstract This article outlines the main sources of VOC in civil aircraft cabins. We compared the current state of control at home and abroad in this field and found there remains a huge blank in relevant domestic standards. To further clarify the baseline of VOC levels in domestic civil aircraft cabins, the VOC contents in the cabin of a domestic aircraft were tested and analyzed by referring to relevant domestic and foreign standards, after which several control suggestions were given. This work is of great significance for establishing VOC control standards in domestic civil aircraft cabins.

КОМПЛЕКС ТАКТИЧЕСКИХ МЕРОПРИЯТИЙ ПО СОВЕРШЕНСТВОВАНИЮ ПРОЦЕССА ИМПОРТОЗАМЕЩЕНИЯ В ОБЛАСТИ АВИАСТРОЕНИЯ В РОССИИ

This article examines the process of import substitution in the field of aircraft construction in Russia. Object: The purpose of this study is to analyze the current situation in the market of air transport services for the production of domestic aircraft and to develop tactical measures to improve the process of import substitution in the field of aircraft construction in Russia. Findings: Based on the analysis, it should be noted that the current import substitution strategy, which is currently operating in Russia, shows a serious dependence in the aircraft industry sector. Consequently, there are serious problems in the formation of domestic corporations and the creation of competitive products. Russia in the aviation industry sector shows a high proportion of import dependence and the existing serious problems of aircraft maintenance, the solution of which is relevant and should be reflected in the transformed strategy in the field of aircraft construction in Russia. Conclusions: Thus, summing up the results of the conducted research on the issue of import substitution in the field of aircraft engineering, it is worth noting that the proposed set of tactical measures and assigned tasks between the main participants in the import substitution process will create conditions for its successful implementation. Therefore, targeted financing and state support for projects to develop the country's production potential, the implementation of measures to create research laboratories based on universities and research centers, training and support of specialists, motivation of young scientists, as well as the creation and modernization of engineering centers, whose tasks will be the development and implementation of modern technologies not only in the aircraft industry, but in and into Russia's largest industrial sector, as well as in a number of other industries, it will allow improving the import substitution process in Russia. Thus, the proposed activities.

Analysis of trends in the functioning of water and air transport in the regions of the Russian Federation against the backdrop of emerging crises

The article discusses current trends in the aviation industry, growth factors in passenger and cargo traffic, key players in various regions of the world, regulatory requirements and market challenges in comparison with one of the most important industries in Russia and the world - water transport. A review of new aircraft concepts has been completed. The authors note the resumption of production of domestic aircraft in the context of the implementation of a policy of active import substitution. The work identifies the advantages of using medium-haul and long-haul aircraft by Russian carriers, and presents the structure of the market positions of the largest airlines in Russia in recent years. The study also assesses the impact of the COVID-19 pandemic on the situation in this area and examines alternative strategies for its recovery. In order to improve flight safety and ensure the sustainability of environmental practices, the need for the development of the domestic aviation industry and its adaptation to the ongoing international transformations is substantiated, which implies the unconditional use of new technologies. The article draws a parallel between air and water transport and compares Russian and foreign indicators of these industries. Thus, a comparison of the dynamics of development of the aviation industry and water transport will reveal their similarities and differences, various advantages and disadvantages, as well as their impact on the global economy.

Discussion on the Integration of Civil Aviation Maintenance and Domestic Aircraft Manufacturers Ideas

The integration of civil aviation maintenance and the concept of domestic aircraft manufacturers has become a key issue in the development of today s aviation industry.With the rapid development of domestic civil aviation industry,the demand for aircraft maintenance and support is increasing.At the same time,domestic aircraft manufacturers have also made major break-throughs and progress in technological innovation and quality management.Therefore,how to integrate civil aviation maintenance with the concept of domestic aircraft manufacturers to achieve more effi cient,safe and sustainable aviation operations has become the focus and challenge of the industry.

Enhancing Air Travel Analysis: Forecasting Domestic Flight Activities in Indonesia based on Aircraft Types using MLP

The COVID-19 pandemic has succeeded in bringing down various industrial sectors, including the aviation industry. This pandemic impacted the depletion of the operational fleet. In 2022, the number of domestic aircraft ready for operation was only around 55%–60% compared to 2019. However, with all its limitations, the aviation industry must develop the best strategy to revive in this post-pandemic era. One of the strategies undertaken is selecting the most efficient and economical aircraft type to cut costs amid market uncertainty due to this pandemic. In this regard, research was carried out to predict when aviation activity in Indonesia would reach regular in January 2020 and the forecast for the dominance of aircraft types in domestic flight. Multilayer Perceptrons (MLP) show that domestic flight activities in Indonesia will reach the standard point in March 2024. From the forecast result, the error rate using MAPE is 0.52%. The aircraft that dominates Indonesia’s domestic flight activities during 2020–2022 is the Airbus 320 type. Meanwhile, for the next two years—2023 & 2024—it is predicted that the Airbus 320 type will continue to dominate the flights.

Adaptation of corporate model of ukrainian aircraft product life cycle to the international methodology of systems engineering

Problems. Under the present-day conditions, the preservation of competences of Ukrainian aircraft construction enterprises will be determined by the possibility of enterprises attracting to participation in international cooperation programs and projects. But this is possible only on the condition of prior harmonization of the product development methodology adopted in Ukrainian aircraft construction to that used in the international aircraft construction projects. Purose. The main goal of this article is to determine the ability and ways of adapting the corporate model of life cycle of aircraft engineering projects by Ukrainian aircraft construction enterprises to modern global aircraft construction practices. Implementation methodology. The research methodology predicted the identification of the main modern trends in the field of system engineering for the creation of a science-intensive product, as well as the analysis of concepts of presenting the life cycle of complex technical systems in international regulatory documents, industry regulations, guidelines and other information sources. Criteria for perspective of using the identified informational and normative sources as close analogues for the development of one's own corporate model of life cycle of an aircraft construction product were identified. On the basis of the criterion analysis of researched concepts of the life cycle of complex technical systems representing, the requirements were formed, which formed the basis of the concept of one's own corporate model of life cycle of the aircraft construction product. The results. The result of conducted research was the proposed concept of a corporate model of the life cycle of an aircraft construction product manufactured in Ukraine, which takes into account the international experience and best practices of leading aircraft construction companies, including focusing on the experience accumulated by domestic aircraft manufacturers. Conclusions. According to the results of analysis of advanced world practices in the field of creating a science-intensive product, an own corporate model of the life cycle of an aircraft product manufactured in Ukraine was proposed. In the future, on the basis of this model, a system for creating an aircraft product can be built and developed, which will be harmonized with existing world practices and will allow the domestic aircraft construction enterprises to fight for participation in international programs and projects.

ДЕЯКІ ТЕХНОЛОГІЧНІ АСПЕКТИ СКЛАДАННЯ АГРЕ-ГАТІВ СУЧАСНИХ ЛІТАКІВ

The structure of the labor intensity of aircraft manufacturing is considered, in which the largest part is occupied by the aggregate and final assembly. The need for redistribution of work between different types of production has been formed in order to further reduce the labor intensity of assembly by forming additional requirements for structural elements that differ from the design documentation and the fulfillment of which would be expected during assembly. The main ways to reduce the labor intensity of the unit and final assembly of modern aircraft have been identified, which consist of increasing the level of production manufacturability of structures, integrated mechanization and automation of production.The main trends in the orientation of aviation production towards modern means of technological equipment are considered. A specification of the use in the technical literature of the concepts “assembly device” and “slipway” is proposed to determine clear guidelines for establishing a certain type of technological equipment, depending on a number of factors. A review of domestic and foreign technologies for assembling and joining assemblies of aircraft structures was completed, and forecast data on the accuracy of the resulting joints was generated. It is concluded that there is a domestic (as well as Soviet, for the most part) aircraft manufacturing practice, which involves performing connection operations here, in the slipway, using mainly built-in (portable) or manual mechanized tools, which leads to a large amount of manual labor, and the need to complete the joints of compartments and units “on site” also makes it impossible to ensure high precision parameters of the joint zone. Examples of processes for joining fuselage compartments of foreign-made aircraft using standless docking stands or mobile robotic platforms are considered, which are integrated with the aircraft coordinate system and allow holes to be placed with high precision, drilled and fasteners installed. An analysis of the factors influencing the final accuracy during assembly and docking work in various “schools” of assembling aircraft structures was carried out. A review of some representatives of technological automated equipment for performing assembly work was carried out. A list of optimal criteria for assessing production manufacturability when making connections during the assembly of aircraft structures is proposed.

Feasibility of new types of technological equipment in the manufacture of nonrigid flat aluminum parts

In this work, we assess the efficiency of the SCHUNK VERO-S Aviation clamping system in manufacturing nonrigid aluminum parts in comparison with the existing technology of their small-scale production at domestic aircraft plants. The research was conducted using the facilities of mechanical shops that manufacture nonrigid aircraft parts to estimate the time and economic expenditures involved in their production when changing the cutting mode and machining allowances. The proposed technological process was implemented by the HALTEC Russian engineering company at an aircraft manufacturing plant of the Russian Federation. The duration of the technological process amounted to a total of 14 hours, with the existing production technology lasting for 300 hours. The process duration was reduced by eliminating two thermal stabilization operations and shortening the machine-setting time by 50%. The machine-setting time was reduced by increasing the number of cutting mode elements during manufacturing of a non-rigid aluminum part using this tooling, as well as by using a modified machining strategy. The use of the SCHUNK VERO -S Aviation system together with a modified machining strategy for a thin-walled non-rigid workpiece allows for an almost complete compensation of deformations caused by residual stresses of the first kind. The new modern technology of SCHUNK VERO -S Aviation proves to be effective for the small-volume and series production of thin-walled nonrigid components of the required quality without warping, multiple straightening operations, thermal and temporal stabilization.

ІНЖЕНЕРНА МЕТОДИКА РЕАЛІЗАЦІЇ КВАЛІМЕТРІЇ У СИСТЕМІ МЕТРОЛОГІЧНОГО ЗАБЕЗПЕЧЕННЯ ЕТАПІВ ПРОЕКТУВАННЯ АВІАКОНСТРУКЦІЙ ІЗ ПОЛІМЕРНИХ КОМПОЗИЦІЙНИХ МАТЕРІАЛІВ

In connection with the permanent growth worldwide, including in the domestic aircraft industry, of the use of polymer composite materials in the structures of civil aircraft, the problem of analyzing the effectiveness of the use of composites at all stages of the life cycle of the corresponding structures becomes relevant. An engineering method for the implementation of qualimetry in the system of metrological support for the main stages of designing structures made of polymer composite materials in civil aircraft of the transport category, based on the use of integrated quality indicators and expert assessment of the characteristics of the main design stages, is proposed and justified. General key tables for the synthesis of significance levels of the main stages of designing composite structures for expert evaluation of the effectiveness of operations have been developed. The main (defining) principles of integral indicators of quality of the components of design levels are established. The reliance of experts on the main features of the quality indicators of the design stages ensures the minimization of errors in establishing the significance ranks of these stages. The decomposition of the classifier of the type "Design of aircraft structures from polymer composite materials" was carried out, which systematizes the analysis and synthesis of the main steps for implementing the proposed engineering methodology for qualimetric support for the design of aircraft structures from polymer composite materials, the sequence and implementation by an expert group.A criterion for the effectiveness of an engineering methodology for qualimetric support for the implementation of design stages has been implemented in the form of an additive model of the ratio of the effect of each design stage, expressed as the sum of quality indicators to the total cost of funds for its provision, taking into account the coefficient of significance of the indicators. A hypothetical example of the implementation of the proposed engineering methodology for analyzing the effectiveness at the initial stages of its development at an enterprise that predicts a promising increase in the volume of use of composites in domestic aircraft of the transport category and their modifications is given. The proposed engineering method for the implementation of qualimetry in the system of metrological support for the stages of designing composite structures of domestic aircraft, after practical testing and refinement in a specific production environment, can become an effective tool for increasing the effectiveness of predicting the growth in the volume of use of polymer composite materials in the domestic aircraft industry.

국내 항공 제조기업의 내부역량이 지속가능 경쟁우위에 미치는 영향 : 시장지향성의 매개효과를 중심으로

점점 치열해지는 경쟁환경에서 기업은 지속적으로 성과를 창출하고, 경쟁력을 갖추어 지속가능한 경 쟁우위를 달성하기 위해 노력하고 있다. 본 연구는 국내 항공제조기업을 대상으로 기업의 내부역량에 초점을 맞추어 기업의 내부역량이 시장지향성과 지속가능 경쟁우위에 미치는 영향을 검증하고자 하였 다. 보다 구체적으로 항공제조 산업의 특성을 고려하여 항공제조기업의 내부역량 요인으로 기술역량, 제품역량, 경영자 역량을 제시하여 기술역량, 제품역량, 경영자 역량이 지속가능 경쟁우위에 미치는 영 향을 검증하고, 이러한 관계에서 시장지향성의 매개효과를 확인하였다. 국내 항공제조기업을 대상으로 수집한 자료를 바탕으로 분석한 결과, 기술역량과 경영자 역량은 지속가능 경쟁우위에 정적인 영향을 미치는 것으로 확인되었지만 제품역량은 지속가능 경쟁우위에 직접효과는 나타나지 않았다. 반면에 기 술역량, 제품역량, 경영자 역량은 모두 시장지향성에 정적인 영향을 미치는 것으로 나타났고, 시장지향 성은 지속가능 경쟁우위에 정적인 영향을 미치는 것으로 나타났다. 그리고 시장지향성은 기업의 내부역 량과 지속가능 경쟁우위와의 관계에서 정적인 매개역할을 하는 것으로 확인 되었다. 본 연구의 결과는 항공제조기업의 내부역량이 지속가능 경쟁우위에 미치는 영향을 확인하였다는 점과 이러한 관계에서 시장지향성의 매개효과를 확인하였다는 점에서 이론적 시사점을 가진다. 실무적으로는 국내 항공제조 기업들이 시장지향성을 추구하고 지속가능 경쟁우위를 확보하기 위해 제품, 기술 그리고 경영자 역량을 향상시킬 수 있는 방안을 마련해야 한다는 시사점을 제공한다.

Development of aircraft brake system

Aircraft wheel braking system is a subsystem with relatively independent function. Its function is to bear the aircraft's static weight, dynamic impact load and absorb the aircraft landing kinetic energy. Its performance directly affects the aircraft's rapid response, sustained combat capability and other overall performance. The aircraft braking system developed from the early mechanical inertia antiskid system to the electronic antiskid system, which is widely used today, has experienced a long history. In this paper, the development of aircraft brake system is reviewed briefly, and the present situation and development direction of domestic aircraft brake system are introduced emphatically.

국내선 항공기 연료소모량 분석을 통한 연료절감 방안연구

This study analyzed and derived a plan to reduce fuel consumption of domestic aircraft. Specifically, this study tested fuel consumption in the short-distance flights of B737. Fuel consumption was calculated by substituting the simulation variable values into Matlab. The strength of this study is that the actual operating environment was reflected by collecting the B737 flight data. As a result of the study, the domestic fuel consumption rate in the computed flight plan was less than the current fuel consumption rate. Existing limitations of this study is that it was difficult to reflect the various variables constituting the flight environment, and thus there can be errors in the measurement of the fuel consumption. There are two major expected applications from this study. First, applying the plans from this study will lead to a reduction in the amount of fuel and thus provide positive economic effects for commercial airlines. Second, the plan from this study will provide a basis for pilots to predict fuel consumption more accurately. In conclusion, this study proposes a fuel saving plan with useful applications for pilots and airlines.

Research on airworthiness test technology of radiation emission in civil aircraft flight control electronic system

It is the first time that domestic civil large aircraft has been developed, which lacks the technical experience of airborne system-level airworthiness qualification, and the research of radiation emission at home and abroad is mainly based on simulation evaluation, while the simulation results are used only as a reference in the airworthiness qualification process and cannot be used as evidence of conformity. And there is little airworthiness test experience on complex system-level. In this paper, taking civil aircraft flight control electronic system as an example, translate airworthiness compliance requirements into engineering requirements, analyze the complexity characteristics of civil aircraft flight control system, build flight control electronic system level radiation emission test system, and improve the system level airworthiness qualification test and optimization process, providing experience for the airworthiness qualification of civil aircraft complex system. The results show that the radiation emission of flight control electronic system is greatly affected by the system environment, and it is necessary to consider the influence of test setup layout and show the system compliance to the RTCA/DO-160G requirements.

The air confrontation on the Soviet-German front at the beginning of Great Patriotic War viewed through the prism of rivalry of the fighter aircraft designer engineers

Based on materials from domestic archives and other sources this paper deals with issues faced by the Red Army Air Force in 1942 due to the increased German fighters preponderance in some technical features. The delay in speed and climb rate of similar type of Soviet aircraft defined their own defensive posture enemy dominance in air battle. To solve the problem of improving the flight data of domestic fighter aircraft, a set of measures was taken by the leadership of the country - the Peoples Commissariat of the Aviation Industry (PCAI) and aircraft design engineers. The decision to install the engine M-82 on the LaGG-3 fighter designed by S.A. Lavochkin, V.P. Gorbunov and M.I. Gudkov, which had put into serial production before WW II breaking out, happened to be advanced. However, the German designers had been also developing. They developed another modification of the Messerschmitt Me-109 - G. Moreover, a new enemy of military aircraft fighter appeared at the front - the Focke-Wulf FV-190. The created La-5 did not have parity in flight data with these enemy aircraft. Boosting the M-82 engine and installing a direct fuel injection unit on it made it possible to increase engine power and significantly improve the flight data of the La-5. As a result of overcoming a complex of issues, Soviet design engineers managed to create and launch into mass production a competitive La-5FN aircraft that met the requirements of the armed struggle on the Soviet-German front of WW II.

The state of aviation field during COVID-19 pandemic

The global pandemic COVID-19 had a serious impact on the dynamics of air traffic. The purpose of this article is to analyze the change in air travel over the past 10 years and to describe the potential situation, threats and suggest alternative ways out of the crisis. As a result, we identified the following problems: insufficient funding for the aviation industry, lack of resources necessary for its development, low level of exports of civil aviation, no credit mechanisms to finance the production of aircraft, lack of incentives for domestic and foreign institutions to invest, lack of control over aviation companies . The largest decline in air travel occurred in 2020. We also see a decrease in flights from 2013 to 2014 in connection with the beginning of military clashes in eastern Ukraine. In 2021, new air carriers entered the Ukrainian market, including Flynas (low-cost carrier of Saudi Arabia) and Eurowings (German low-cost carrier). It was found that domestic flights through the airspace of Ukraine have increased. An important impetus for their growth is the development of regional airports with the prospect of creating a National Airline. The positive dynamics was influenced by the opening of new passenger flights (Kyiv-Uzhhorod, Chernivtsi-Kryvyi Rih) and the adoption of the draft law №5301, which extended the term of granting Ukrainian airlines a transitional period for the transition to the use of domestic aircraft. In the summer of 2021, flights resumed, and Ukrainians are actively flying to Turkey, Egypt and the Dominican Republic - the most popular destinations. As for Ukrainian airports, their passenger traffic has decreased significantly since 2019, more than twice. Therefore, we propose to look for ways to reduce airport costs and fees, reduce aircraft fleet to save on their maintenance, reduce staff, refocus on charter flights, reduce the tax burden and encourage investors, which is especially important.

НАБЛИЖЕНИЙ МЕТОД ЕКСПЕРТНИХ ОЦІНОК ЕФЕКТИВНОСТІ ЗАСТОСУВАННЯ ПОЛІМЕРНИХ КОМПОЗИЦІЙНИХ МАТЕРІАЛІВ У КОНСТРУКЦІЯХ ЦИВІЛЬНИХ ЛІТАКІВ НА ОСНОВНИХ ЕТАПАХ ЖИТТЄВОГО ЦИКЛУ

In connection with the growing use of polymer composite materials all over the world and in domestic aircraft construction in civil aircraft of the transport category, the analysis of forecasting methods of their application at the main stages of the life cycle of this class of structures becomes an urgent problem.Efficiency, as the ratio between the achieved result and the resources spent on its achievement, can be interpreted as the ratio between the total quality indicators of the created object and the total costs.However, quality indicators are such metrological characteristics, the quantitative measurement of which in most cases is difficult or almost impossible. In this regard, the qualimetric quality indicators acquire the qualimetric form of qualitative characteristics. Qualimetric characteristics make it possible to operate during their analysis by a productive method of expert assessments of criteria for the implementation of any object, including composite structures of aircraft aggregates. As a criterion for predicting the effective volume of use of composite structures, an analogue of D.L. quality at the stages of their life cycle. The numerical values of each level of the stages of the life cycle are assessed by an expert according to the proposed five-level general identification tables with the subsequent summation of the criterion indicators by stages of the life cycle, making it possible to determine both the efficiency of using composites at individual stages and its integral value for all main stages. The relative value of the efficiency criterion can be represented in monetary terms by multiplying it by an equivalent established on the basis of metrological (qualimetric) methods and means of assessing the results of a particular production.

Application of AHP and PESTEL-SWOT Analysis on The Study of Military Amphibious Aircraft Acquisition Decision Making in Indonesia

Indonesia’s characteristics as an archipelagic state along with the increase of traditional and non-traditional threats in Indonesia require the ownership of military amphibious aircraft to oversee its maritime territories and perform logistics distribution to remote areas with minimum accessibility, especially its outermost islands. This study applied a combination of analytic hierarchy process (AHP), Political, Economic, Social, Techonology, Environment, and Legal (PESTEL) and Strength, Weakness, Opportunity, and Threat (SWOT) analysis to conduct a structured, systematic, measurable, and comprehensive decision-making process for selecting military amphibious aircraft and prescribe strategic recommendations on the acquisition plan. By using 3 criteria, 14 sub-criteria, and 3 alternative aircraft models, the results of AHP analysis showed that the Beriev Be-200 aircraft are the most preferred aircraft by the Indonesian users. The results of PESTEL-SWOT analysis show that good diplomatic relations between Indonesia and the manufacturer’s country of origin, users’ support to the plan, and user’s ability to adapt in operating and maintaining the aircraft support this decision. Meanwhile, limited fiscal capacity and domestic aircraft maintenance facilities/depots, as well as the risk of spare parts scarcity, have to be addressed for Indonesia to acquire its own military amphibious aircrafts.

Оцінки екосистеми в найбільш забруднених регіонах України та прогнозування стану довкілля

The article considers the method of assessing the ecological condition of the territory of the Zaporozhye region, under the influence of negative factors of different nature. Zaporizhzhia region is one of the busiest regions in terms of industrial potential, which is due to the presence and concentration of enterprises of ferrous and nonferrous metallurgy, thermal power, nuclear energy, chemistry, and mechanical engineering. The region is a leading center of domestic aircraft engine construction, production of transformers and other high-tech products. According to the dynamics of pollutant emissions in Zaporizhia and the region, the largest contribution to air pollution in the Zaporizhia region (60-70%) is made by pollutant emissions from stationary sources of PJSC «Zaporizhstal», PJSC «Dniprospetsstal», PJSC «Ukrainian Graph» and others. Moreover, a significant part of industrial enterprises are located almost in the center of residential buildings, which forms the main man-made load on the environment of settlements. The main air pollutants in the region are ferrous and non-ferrous metallurgy, thermal power, chemistry, and mechanical engineering, which account for almost 90% of emissions from the total amount of pollutants in the region. The purpose of the presented work is a method of assessing the ecological condition of the territories of the Zaporozhye region. To achieve this goal, an integrated criterion for assessing the ecological condition of the territory was developed. The table of risk indicators and health index for air quality is given, the data of which were compared with the calculations of total air pollution.

METHODS OF EVALUATION OF EFFECTIVENESS OF REPAIR OF AIRCRAFT L-39 AT AIRCRAFT REPAIR ENTERPRISES IN CONDITIONS OF HYBRID WAR

In ensuring the efficiency of repairs on L-39C aircraft at aircraft repair enterprises, the regulatory framework is of great importance, which provides an opportunity to perform repairs efficiently, quickly with savings in public funds. In this regard, the issue of organization and implementation of repairs by the Ministry of Defense of Ukraine needs special attention. The quality of aircraft repairs is controlled at existing enterprises almost since their inception for more than 50 years. Since then, the creation of a regulatory framework that ensures the functioning of factory repairs of aircraft began.
 The issue of improving the efficiency of aircraft repair by aircraft repair enterprises is relevant and complex at the same time, because every year in the world becomes more demanding requirements to ensure safety, regularity of flights, reduce maintenance costs, restoration and repair of aircraft. In recent years, aircraft repair enterprises in Ukraine have seen a significant decline not only in production, but also in the level of quality and range of services provided. Therefore, it is necessary to develop a set of scientifically sound methods for evaluating and improving the efficiency of aircraft repair by domestic aircraft repair enterprises.
 The purpose of the article is to develop recommendations for improving the efficiency of repairs on L-39 aircraft at the aircraft repair enterprises.
 The analysis of ways to increase the efficiency of repair of L-39 aircraft due to such factors as: time, cost, quality.
 According to the results of research, methodological ways to increase the efficiency of repair of aircraft type L-39 are proposed.