Effect of Ambient Temperature Variations on the Direct Operating Cost of a Domestic Flight

This paper analyzes the direct effect of variable ambient temperature during the cruising phase and its effects on the strategies to reduce airlines direct operating costs. Fuel and time efficiency have become an increasingly important factor in the aviation industry. The fuel is one of the largest parts of airlines operating expenses and time is a parameter affecting direct operating cost items such as flight crew salaries, air traffic enroute charges and maintenance etc. A comprehensive aircraft performance model is developed to estimate the changes in fuel consumption and flight time by an Airbus 320-214 due to daily temperature variations. The seasonal change of the tropopause height is taken into the account in the atmosphere model. Cost index is kept as constant in the analyses. A domestic flight between Istanbul and Hakkari is used as a sample to predict changes in the direct cost of flight at day and night, in the summer and the winter seasons. The flight time is noticed to be changing significantly with respect to temperature variations.

Çevresel Sıcaklık Değişiminin Bir İç Hat Uçuşunun Doğrudan İşletme Maliyetine Etkisi

Bu makalede, seyir uçuşu safhasında, değişken çevresel sıcaklığın havayolunun doğrudan işletme maliyetini düşüren stratejilerine etkileri incelenmiştir. Yakıtın ve zamanın verimli kullanımı, havacılık endüstrisinde gün geçtikçe daha da önemli bir faktör olmaktadır. Yakıt, havayolları işletme giderlerinin en büyük kalemidir. Zaman ise uçuş mürettebatı maaşları, hava trafiği yol ücretleri, bakım gibi doğrudan işletme maliyeti kalemlerini etkilemektedir. Airbus 320-214 tipi bir yolcu uçağının, yakıt tüketimindeki ve uçuş süresindeki değişikliklere, günlük sıcaklık değişiminin etkisini tahmin etmek için kapsamlı hava aracı performans modeli geliştirilmiştir. Tropopoz yüksekliğinin mevsimsel değişimi de atmosfer modelinde hesaba katılmıştır. Analizlerde maliyet endeksi sabit tutulmuştur. Çalışmada, İstanbul ile Hakkâri arası iç hat uçuşu, kış ve yaz mevsimlerinde ve gündüz ve gece uçuşlarında doğrudan uçuş maliyetinin değişimi için incelenmiştir. Uçuş süresinin sıcaklık varyasyonu ile önemli şekilde değiştiği gözlenmiştir.

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