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58 In Figure 5.3, the maintenance costs of studied aircraft configuration are represented. It is de- duced that TSTH2 has the lowest maintenance cost, even smaller than A320. Another deduc- tion is that, the maintenance costs increase with the number of engines and it seems appropri- ate. The turboprop engine equipped aircraft have higher costs due to its higher mass compared to turboshaft engines. The reduction in costs also arise from the lower number of shafts and compressors stages. Similarly, the electric engines have higher costs due to their high specific power. In fact, the hydraulic system needs more maintenance. According to Rosero (2006), the maintenance costs of electric system is lower than a hydraulic system. This specific difference cannot be taken into account in the AEA method for calculating DOC since in this method, the calculation of Maintenance Costs mainly relies on the operating empty mass of the air- craft. Also, according to Caldwell (2018), the price of hydraulic motors is less expensive. 5.1.3 Trip Fuel Mass & PSFC Figure 5.4 Different aircraft configurations vs trip fuel mass The above graph provides an interesting outlook on the variation in trip fuel mass for different aircraft configuration. Repeatedly, the fuel mass of TSTH2 is the lowest. It is mainly because of the lower PSFC of turboshaft engine. The difference pattern in fuel mass due to number of engines varies according to the gas turbine engine. 12000.000 10000.000 8489.000 8000.000 6000.000 4000.000 2000.000 0.000 10300.7 9749.2 A320 TSTE2 TSTH2 TSTE4 Different Aircraft Configuration TPTH2 TPTE4 TPTH4 8658.0 8369.4 8707.8 8729.0 9571.0 9173.3 TSTH4 TPTE2 Trip Fuel Mass (kg)PDF Image | Comparison of Concepts: Classic Jet Propulsion, Turbo-Electric Propulsion and Turbo-Hydraulic Propulsion
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