The Turn Pattern (TP) starts with the aircraft established on which parameters?

The Turn Pattern (TP) is initiated when the aircraft is established in straight and level flight on any numbered heading. This condition provides a stable and neutral starting point, allowing the pilot to focus on the execution of turns without the complications introduced by climbing or descending. Being in straight and level flight ensures that the aircraft’s performance is predictable and allows for correct coordination and control inputs during the turn, making it easier to understand the effects of yaw, roll, and attitude changes.

Starting from a climb or descent introduces changes in aerodynamic forces and requires additional management of power and pitch, which can distract from the primary focus of mastering turns. A turn initiated from a bank angle also doesn't match the procedural requirement of the turn pattern, as the concept focuses on establishing control and predictability before engaging in maneuvering.

Thus, choosing to start from straight and level flight on a numbered heading aligns perfectly with the structured approach of the Turn Pattern, emphasizing the importance of maintaining stable flight before transitioning into more dynamic maneuvers.