This manual has been prepared for those pilots embarking on their first type endorsement on a multi-engine aircraft. It is done in the knowledge that the type endorsement has to be oriented to a specific aircraft. Nevertheless the principles are common to all types. It was felt that a general but detailed text was needed to allow the student to prepare for the rating and to assist the instructor in structuring the programme and its content. The manual is in two parts: Part One Covers all facets of twin operation including systems description, aerodynamics, normal operations, abnormal operations, VFR, night and IFR considerations and flight planning. There is also a chapter on commercial operations with traps for the unwary. Part Two Describes a structured type rating programme with suggested content for the lectures, long briefings and pre-flight briefings.