What is the difference between a 'turnback' and an 'engine failure' procedure?

A turnback is specifically a maneuver executed shortly after takeoff, designed to return the aircraft to the departure runway. In the process of a turnback, the pilot must navigate the aircraft back while managing altitude and airspeed carefully to ensure a safe return. This maneuver requires precise control to mitigate the risks associated with losing altitude during the turn, given that the aircraft is still low to the ground and closely approaching critical phases of flight.

On the other hand, engine failure typically refers to a situation where the aircraft has lost engine power, necessitating an immediate response to manage the aircraft’s glide and maintain control. During an engine failure, the pilot must focus on establishing the best glide speed, finding an appropriate landing site, and preparing for a possible emergency landing, which may not necessarily be back at the departure airport.

Thus, the key distinction lies in the context and nature of the actions: the turnback is about returning safely to the airport after takeoff, while managing an engine failure requires the pilot to prioritize immediate aircraft control and safe descent, often leading to landing at a different location rather than directly back to the runway of departure.