Regional aircraft are playing a significant role in airline operations. This paper considers the problem of selecting an appropriate aircraft from the airline fleet for optimal regional air travel realization. Complexity balance between air travel demand (passengers, goods) and the proposed aircraft capacity presents the priority in airline operations. A principal feature of the methodology considered in this paper is a multi attribute analysis of technological and operational aircraft characteristics (turboprop and turbojet). A comparison of the presented regional aircraft parameters is based on the following criteria: technological (aerodynamic efficiency, structural efficiency, fuel flow at the optional FL, cruise endurance and requested trip fuel for the fixed cruise range), operational (max range with max payload, ground efficiency (aircraft maintainability based on external dimensions) and climb capability. With the aim of defining aircraft rank, the TOPSIS (Technique for Order Preference by Similarity to Ideal Solution) method was applied. Therefore, the Saaty scale was used for developing the weight of different criteria. The conducted research included a sample of four representative regional aircraft: Do328, CRJ100er, Saab2000 and ERJ145. The results obtained would help in determining the airline fleet or selecting the optional solution from the existing fleet.

The problem of the aircraft noise is certainly one of the factors that affect not only at the planning of a new airports or expanding of the existing airports, but also at the aviation industry as a whole. In order to mitigate this problem, a series of a different measures are undertaken today, whose effects are finally evaluated by the application of an appropriate indices and the aircraft noise metrics. In this paper, a brief chronological review of the aircraft noise metrics development is shown, as well as their classification according to the different criteria. The analysis of the certain aircraft noise metrics, with the close attention to their interconnections, is accomplished. Additionally for the nowadays frequently used metrics and their advantages and limitations, special attention was given. An overview of the supplemental aircraft noise metrics, which are now proposed and as such can be accepted by the general public, is given. Key words: aircraft, noise, metrics

The critical concern of modern airports is the air pollution generated by air traffic and its impact on the airport environment. Air pollution is an unavoidable consequence of air traffic, but it can be reduced in numerous ways, including technical innovations in aircraft design and legislation. This paper presents a model of air traffic assignment as a measure to mitigate the concentration of air traffic pollution. The air traffic assignment model was developed specifically for Nikola Tesla Airport but could easily be applied to other airports. The model is based on the categorisation of aircraft according to engine type and the assignment of specific runways for take-off and landing for each aircraft category. It incorporates two basic goals: to increase airport capacity and to reduce the pollution level in the area around the airport. Although these goals are contradictory, it has been shown in the case of Nikola Tesla Airport that the proposed air traffic assignment model successfully creates pollution level equilibrium in the area around the runway thresholds and an increase in airport capacity. The paper suggests pollution measurement points as the basis for a pollution management tool and system for daily air traffic pollution control. Santrauka Šiame straipsnyje aprašomas oro transporto paskirstymo modelis, leidžiantis sumažinti oro transporto srautų sukeliamą oro taršą. Šis modelis sukurtas Nikola Tesla oro uostui, bet yra lengvai pritaikomas ir kitiems oro uostams. Modelio pagrindas – tai orlaivių klasifikavimas pagal variklių tipus ir tam tikrų KTT paskyrimas atitinkamoms kategorijoms. Siekiama išnaudoti visas oro uosto galimybes ir sumažinti taršos lygį. Nors tikslai atrodo priešingi, tačiau įrodyta, kad pasiūlytas oro transporto paskirstymo modelis sėkmingai išlaiko taršos lygio pasiskirstymą prie KTT pradžios ir padidina oro uosto galimybes. Taip pat siūlomi tinkami taršos matavimo taškai kasdienei oro taršos kontrolei.

The purpose of this paper is to define an analytical tool intended to provide a sound, technically justifiable, and consistent approach to analyzing the risk posed by aircraft accidents. The methodology presented in this paper takes into consideration items determined to be important to understanding the risk of aircraft accident and safety appraisal. These items include a number of aircraft operations/flights; crash probabilities; aircraft characteristics; costs, revenues, socio‐economic benefits, value statistical life, etc. The presented case study gives various cost assessments for an A320 crash depending on accident severity and aircraft age. It could be used as a risk assessment tool for implementing safety management system (SMS) process. Santrauka Šio straipsnio tikslas ‐ aprašyti analizės priemonę, skirta patikimai ir techniškai pagrįstai orlaivių avarijų rizikos analizei. Straipsnyje pateikta metodika gali įvertinti svarbiausius orlaivių avarijų rizikos ir saugos aspektus: tai orlaivių skrydžių skaičius; avarijų tikimybė; orlaivio charakteristikos; išlaidos; pajamos; socialinė ir ekonominė nauda; statistinė eksploatavimo trukmė ir pan. Pavyzdyje pateikiamas įvairių orlaivio A320 avarijos sąnaudų vertinimas priklausomai nuo įvykio sunkumo ir orlaivio amžiaus. Vertinimo metodika galėtų būti taikoma kaip rizikos vertinimo priemonė, diegiant saugos valdymo sistema (SVS).

PurposeThe purpose of this paper is to define minimum cost technique of turbo fan transport aircraft in the presence of dynamic change of aircraft performance. Results can be practical applicable in airlines for achieving minimal operation costs.Design/methodology/approachLogarithmic differential is applied for defining conditions in order to achieve optimal Mach number for minimal climb cost. This condition is solved numerically by using Newton‐Ramphson method, to obtain optimal Mach number distribution with altitude. Conclusion about optimal top of climb (TOC) is defined after analyses for different aircraft mass and cost indexes.FindingsProposed method of minimum cost climb resulting in potential savings up to 5 per cent compared to Aircraft Flight Manual climb law. Proposed method also made correction of climb law and optimal TOC under existence of aircraft performance degradation.Practical implicationsUse of defined climb law and optimal TOC will minimize cost of en route flight profile.Originality/valueAt present, there is no definition of climb technique for minimum cost of en route flight profile, under dynamic degradation of aircraft performance. Final results are standardized to become applicable and easy to use with modern and old type of flight management system.