本研究主要是針對T-34C型機常發生起落架問題做深入研究及分析，飛機在空中飛行時，其大氣流場之風向為非定常變化，然為能找出問題癥結點，就實際發生的情況，執行假設及固定一些特徵及數值。本研究先就T-34C型機於103年常發生起落架系統相關案例作敘述、分析及歸類；另依據修護技令規範、起落架系統運作原理及起落架系組件等因素，判斷飛機於飛行時，因於不同飛行速度下，執行起落架伸放時，受起落架艙內外壓差影響，導致起落架內側門收上的力量小於因起落架艙內外壓差產生之作用力，並運用CFDRC計算流體力學軟體，模擬飛行人員任務歸詢場景，於高度10,000呎、空速120KIA及平飛狀態下，執行收起落架動作，並以維修人員於每100小時週檢期間執行T-34C型機內側門張力設定調整之翼剖面位置（NACA23016）進行二維數值模擬，最後運用白努力定律衍生公式計算於不同空中飛行速度（90、100、110及120海浬/小時）下，起落架艙內外壓差產生之作用力與技令TO CAF 1T-34C-6WC-3第1-008卡第6項訂定規範（40至67磅力）逐一探討，發現模擬實驗之結果，初步可以獲得映證，後續將請維修人員於每100小時週檢期間，主起落架收上後內側門磅數調整於54至67磅力之間或請飛行人員提前於飛行速度100海浬/小時收起落架。

The purpose of this thesis is to research and investigate main landing gear door malfunctions that frequently occur in T-34C aircraft. Aircraft airflow changes continuously in the air. In order to find the reason for landing gear malfunctions, I proposed a hypothesis with fixed characters and values in a real situation. I collected the frequency of discrepancies in T-34C aircraft in 2014. According to the technical order and operating principles of the T-34C landing gear system, I posited that there is a pressure difference between the inside and outside of the landing gear cabin when the aircraft are in the air. I calculated the force of the T-34C airfoil (NACA23016) in CFDRC when aircraft fly at 90, 100, 110, 120 knots per hour at an altitude of 10,000 ft. The results of experiments indicate the following: 1.Technicians need to adjust the landing gear tension (54-67 pounds). 2. The pilot should put the landing gear up when flying at speeds over 100 knots per hour.

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