中華民國空軍官校T34C教練機為培育空軍飛行員的首要機型，而重落地為常見的飛安因素，本研究將探討重落地對該型機種之飛航安全影響及預防處置作為。並期望藉由研究重落地的案例以及成因，檢視其發生原因、過程並提出處置及預防作為，期能降低重落地發生的機會。本研究透過六起案例了解重落地對於飛航安全影響甚鉅，並透過文獻探討及專家訪談歸納出重落地成因為操做過量、平飄過晚、鼻輪先觸地等三項原因；與海豚跳的成因為落地姿態淺平、落地後鬆桿、平飄過晚、與進場空速過大，而重落地後有極大的機率會造成海豚跳。對空軍官校現階段已開始實際飛行之受訓學員的網路問卷發放平均統計結果，約有78％的學員對此問卷中重落地的知識及觀念較為正確熟悉，但是約有22％的學員對此問卷中重落地的知識及觀念較為不熟悉。有待本研究進一步探討其未能確實掌握重落地預防處置的因素。本研究提出以下兩點建議作為重落地對於該型機種的預防處置。重落地事前預防：執行降落時遵守在計畫著陸區著陸、在建議著陸速度著陸、著陸時下降率趨近於零、著陸時飛行線平行跑道，如有任何疑慮或無法掌控飛機狀態應執行重飛。重落地處置作為:當重落地後飛機彈起應立即執行重飛。

T34C is the first airplane for R.O.C. Air Force Academy cadet pilots’ training flights. During the flying training, hard landing is always considered the most affecting factor to the aviation safety for cadet pilots. Through 6 different case studies, literature reviews and expert interviews, current research analyzes the root causes of hard landing from questionnaires and provides a prevention strategy derived from expert interviews of senior trainers to reduce its occurrence. Prevention strategies are discussed as following categories: excessive operation; late flare, and early nose gear touchdown. The probable causes for airplane porpoise is due to shallow flat of configuration, early release stick after landing, late flare, and excess approaching speed at landing. Questionnaires were emailed to those cadet pilots, and analyzed results indicate that 78% of cadet pilots had correct concepts when encountered hard landing conditions which are of great safety concerns. Two recommendations against T-34C hard landing were proposed. First, the prevention strategy against hard landing is to land the airplane at targeted landing zone under proposed landing speed, to maintain zero descending rate when approaching at landing zone, to keep flying path parallel to runway centerline, and prepare to go-around immediately if there were any doubt or uncontrolled aircraft configuration conditions. Second, the pilot should initiate go-around procedure immediately when airplane is porpoising during touchdown stage.