When it comes to determine whether or not to acquire an aircraft, its real price and its airworthiness condition, it is essential to know in detail the physical state of the aircraft, the operating remnants of components with limited life and the existence of up-to-date technical documentation regarding the compliance with the maintenance program, the major interventions and modifications that have been made to it, the register of approved damages, manuals and several other documents about the airframe, engines, landing gear and APU