An aircraft maintenance engineer is mostly responsible for the control, maintenance and repair of aircraft instrumentation and related aircraft equipment. These engineers also learn to set engine controls and test them for correct functioning. They play a major role being maintenance personnel to keep the aircraft 'airworthy' at all times. The maintenance of modern sophisticated aircrafts calls for high degree of technical knowledge, competence, proficiency, dexterity and integrity on part of the concerned personnel. Aircraft engineers research, design, manufacture and maintain aircraft. They work on any and every mechanical aspect of the craft, including airframes, hydraulics and pneumatics, engines and fuel systems and control and communications systems. The Aircraft Maintenance Engineer is also at times known as an Aircraft Technician. Engineer being a common term used in UK, while technician stands for the same thing in aviation industry. Civil Aviation is a highly regulated and respected industry controlled by national civil aviation authorities. To maintain the established desired safety standards, individuals working in the aviation industry must be licensed. Therefore a student wishing to establish a career in the Aviation Industry must undertake professional training leading to the appropriate qualifications and certification so as to become an authorized person for release of aircraft. The higher standards of safety are thus ensured by confirming that all maintenance work and all maintenance engineers are fully trained and regulated.