What is considered a prohibited maneuver involving spins?

In aviation, spins are dynamic and can pose significant risks depending on the nature of the spin. An inverted spin is considered a prohibited maneuver because it typically occurs after an aircraft enters a traditional spin and is then maneuvered into an inverted position. This type of spin can lead to unpredictable aircraft behavior and a difficulty in recovery when compared to upright spins.

In contrast, controlled spins, steady spins, and flat spins can sometimes be performed under specific circumstances by experienced pilots in controlled environments, particularly in aerobatic training or flight demonstrations. Flat spins, while they are problematic, are not universally prohibited and can sometimes be recovered from with proper techniques. Controlled and steady spins may also be performed safely within the scope of aerobatic maneuvers, hence they do not invoke the same level of risk as inverted spins. Therefore, the classification of inverted spins as a prohibited maneuver is rooted in their inherent instability and difficulty in recovery.