Prof. Dr. Ljubiša Vasov
University of Belgrade,
Faculty of Transport and Traffic Engineering

Abstract: Through economic and environmental effects, the rational use of energy resources in air transport represents an important segment of general efforts in global environmental protection. Increasing the energy efficiency of transport aircraft is a complex problem, and the basis of this task is the consumption reduction of jet fuel, designed for use in aircraft powered by different types of gas-turbine engines.
Practically every element of the air transport system has a certain influence in this domain, starting from the manufacturer with the design and production of the aircraft, through the influence of an operator on the efficiency that the aircraft shows in the airlines, to the influence of the traffic environment and air traffic control. In this paper, special attention is given to the direct influence of the operator on the achieved aircraft fuel efficiency in the fleet.
The selection of primary activities that can be carried out in the operational environment to reduce fuel consumption was made, by considering the operating processes within the framework of the performance and control of the technical condition of the aircraft. Several activities can contribute to reducing consumption, such as control of mass and position of the center of gravity, aircraft ground operations management, control of the technical condition of aerodynamic and control surfaces, as well as control of the operation of aircraft systems and instruments.
By analyzing the mentioned activities, it was shown that numerous items have an influence on fuel consumption. A key element in identifying priorities when taking appropriate measures is the assessment of fuel consumption reduction based on flight parameters data. Based on this data, an evaluation of possible fuel savings was made for different types and categories of aircraft. It has been shown that the cumulative effect of individual small contributions can result in a significant reduction in fuel consumption.

Key words: aircraft, fuel consumption, performance, technical condition, operational environment

Biography: Ljubiša S. Vasov, Ph.D. full professor, was born in 1961 in Prokuplje – Republic of Serbia. He graduated in 1986 at the Faculty of Mechanical Engineering in Belgrade, at the group for Aerospace Engineering. For outstanding success during his studies, he was awarded by the Council of the Faculty of Mechanical Engineering. After studies, he was employed at the Aviation Technical Institute in Žarkovo - Belgrade, where he worked on the problems of aircraft cockpit design and the construction of aircraft flight controls. He participated in several national projects for the development of new types of aircraft. Since 1989, he has been employed at the Department of Air Traffic and Transport at the University of Belgrade - Faculty of Transport and Traffic Engineering, where he obtained a Ph.D. degree. At the Division of Aircraft, he is teaching professor on the following subjects: Flight Mechanics, Aircraft Instruments, Aircraft Powerplants, Aircraft Systems, (undergraduate studies), Aircraft Maintenance and Reliability, Aircraft Maintenance Management (master studies), and Effectiveness of transport aircraft (doctoral studies). Since 2008, he has been engaged at the University of Niš - Faculty of Mechanical Engineering, as a teaching professor on the following subjects: Aircraft (undergraduate studies), and Aviation Engineering (master studies). In his previous work, he participated in the realization of several projects and was the mentor of more than 30 graduate and master's theses and two doctoral dissertations. He is a member of the editorial board of one international scientific journal and a permanent member of the editorial board of a few international conferences. He has reviewed several books in the field of aviation and is a regular reviewer for several international scientific journals. Furthermore, he is the author of two books and one monograph and has more than 80 published scientific papers and scientific research studies in the field of the maintenance and effectiveness of transport aircraft. He participated in the work of several professional bodies at the Faculty, he was a member of the Council of the Faculty of Transport and Traffic Engineering and Head of the Department for Air Traffic and Transport. Since 2012, he has held the position of Head of the Division of Aircraft.