Aircraft maintenance engineers can often focus on a certain sub-section of aviation engineering. Some of these categories are airframe and powerplant, hydraulics, electrical and aerodynamics. Due to the complexity of most aircraft and the fact that their safe and proper operation is paramount to the safety of the people who fly in them, specific maintenance focused on one avionics discipline is very common in today's industry.

Maintenance engineers in military aviation play a particularly important role. They of course perform similar duties that commercial aircraft maintenance engineers carry out but in addition they have the responsibility of overseeing and maintaining the most advanced aircraft in the world. Because of this added responsibility, they typically have more advanced training to be able to perform their functions, such as diagnosing and maintaining advanced weapon systems. In fact, some of the training and skill that military aircraft engineers possess and perform aren't even known to the public due to highly classified planes and procedures.

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