The main purpose of the Medical Manual is to assist and guide designated medical examiners, medical assessors and Licensing Authorities in decisions relating to the medical fitness of licence applicants as specified in Annex 1. It is, however, envisaged that the manual might also be useful to supplement properly supervised theoretical and practical post-graduate training in aviation medicine. Thus the chapters of the manual have been edited so that it may serve also as a textbook. Part V, Chapter 1, contains detailed guidance on aeromedical training for medical examiners. In this third edition of the Medical Manual, some limitation of contents has been necessary. The scope of the material includes, particularly, guidance on those areas in which difficulties have been experienced by Contracting States.