A reference and guide for student and qualified professional pilots dealing with the intricate problems of aeroplane performance related to Performance Groups A, C, D, and E. The text associated with comprehensive t ables and diagrams will help all pilots to understand not only the various procedures associated with each performance group, but also the reasons behind the various procedures and their relationship with airworthiness and operating regulations. Starting with legal requirements, the book guides the reader through aerodome and meteorological considerations leading to the determination of a safe operating weight. In the case of Performance Group A, the development of the critical speeds associated with the weight, including the implications of selection of speed is discussed. Optional take-off procedures - variable take-off thrust and increased V2 - are explained comprehensively, as are abnormal procedures such as contaminated runway operations and brake energy limitations. The different regulations relating to each performance group, utilising normal or optional procedures, are explained clearly with the aid of diagrams.