The General Technical Secretariat of the Ministry of Defence publishes the work of Dr. Francisco Ríos Tejada - Medical Commander and Head of the Aerospace Medicine Service at the Aerospace Medicine Training Centre (CIMA) - on the particularities of air accidents. Dr. Ríos presents step by step the whole process and protocol to be followed in the investigation of an accident of this type, therefore, he structures the logic of the process in a sequential way, that is, after defining the concept of "air accident" from those of incident, dangerous situations, etc., he goes into the subject in depth, showing us even the practical aspects: how the expert reports are drawn up; the taking of samples; the interviews with accident victims and witnesses. It is already a reference text, as well as being completed with a select bibliography and abundant graphic material.