This paper presents a study performed on air refuelling texts addressed to non-experts. Specifically, the aim is to discover the relationships between the different forms of knowledge at a conceptual level. After delimiting a small sample from aircraft-related magazines, a terminological method was applied to create a database from which the concept representations of the corpus were selected: illustrations, terms, explanations, and texts inserted inside illustrations. With the results of this research it is hoped a better understanding technical communications of low levels of specialization will be possible, thus contributing to the translation of this type of text.