The Tomahawk has a real-world reputation for being very susceptible to entering spins. We have included this behaviour in this simulation of the Tomahawk,

To enter a spin, reach a safe altitude and reduce the throttle to idle. Pitch the nose up to bleed off airspeed until the stall warning horn sounds. Just before the stall occurs, apply full left rudder to enter the spin. Once established in the spin, release pressure on all controls and the aircraft will remain in a spin until pilot input is applied. 

To exit a spin, apply a rudder input opposite to the direction of the spin and push the nose down. Reduce the throttle to idle and once the aicraft exits the spin, pull the nose up gently to return to straight and level flight. Trty not to exceed the aircraft’s VNE (never exceed speed) or G-limits when pulling out of the dive.