Which of the following maneuvers is classified as prohibited in the T-6?

Aggravated Spins past 2 turns are classified as prohibited in the T-6. This restriction is crucial because spins can be dangerous and lead to loss of control of the aircraft. The T-6 is designed to recover from spins within a specified limit, which is typically not to exceed two turns. Exceeding this limit could result in a highly unrecoverable state, increasing the risk of accidents.

When it comes to the other options, normal spins, controlled loops, and Immelmann turns are maneuvers that have specific performance capabilities within the aircraft's design and operational limits. While certain spins are acknowledged as part of training, prolonged or aggravated spins beyond the specified limit can lead to severe aerodynamic issues and potential structural failure, hence the emphasis on prohibiting such maneuvers for safety.