This paper aims a) to analyze the challenges in teaching aviation vocabulary and radio phraseology at high school level in English language instructors’ perspective and b) to present some recommendations that can help to reduce encountered problems if taken into consideration in the design and implementation of the related syllabus and course program. This study is based on a qualitative research model in which focus group interview is used as the data collection procedure. It is a fact that the challenges encountered in teaching technical vocabulary initiate from the very nature of teaching English for specific purposes to the learners of English as a foreign language. According to the results of this study, the problems occurring in learning environment are classified and analyzed in two main categories: The first group of problems arises from the students’ language competence and motivation. The second originates from instructors who are mostly experienced, therefore more motivated in English language teaching but not in aviation as a technical field.