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Aircraft mechanics (Airframe/Powerplant or A&P) have the important job of ensuring that airplanes and helicopters are safe to fly. They maintain and repair aircraft systems such as engines, propellers, landing gear, hydraulics, electrical, oxygen, flight controls, and the exterior of the aircraft.
21st century aviation personnel are able to use computers--to take advantage of today's technological advances to predict equipment failure, speed turn-around times, and utilize advanced materials and processes to reduce costs and increase reliability.
Monitoring systems on aircraft help make the pilot's and the technician's jobs easier. Passengers can rest assured that the aircraft's maintenance history is electronically updated, so the next flight will depart on time and will fly safely to it's destination.