The Socata TB-30 Epsilon is a single-engine propeller-driven military trainer designed and produced by the French company Socata. Designed in collaboration with the French Air Force, the TB-30 Epsilon is intended for the learning of future pilots, allowing a more rational and economical first stage of training than direct passage on a jet. The cockpit, two-seater in tandem, has a great similarity to that of a combat aircraft. The piston engine is fitted with a single magneto with twin rotors. The propeller is equipped with a simplified pitch change system; in fact, the movement towards small pitch is carried out by an oil pressure, the interruption of this oil pressure causes the blades to move towards large pitch. This movement towards a large pitch is obtained thanks to counterweights judiciously placed on the blade feet. Centrifugal force causes the blades to rotate.