What is one of the prohibited maneuvers involving spins?

The correct choice highlights a critical safety consideration: performing spins with the flaps extended can significantly alter the aircraft's stall characteristics and recovery capabilities. When the flaps are deployed, the aircraft may behave unpredictably during a spin, increasing the risk of loss of control. In standard flight training, it is emphasized that spins should only be performed in clean configurations (flaps retracted) to ensure the aircraft responds predictably and safely during recovery.

Other options have varying levels of acceptable context. For instance, spins at certain altitudes may be permitted under specific conditions and training environments. Spins without a coordinated approach can result in an uncontrolled entry into the spin, but this option does not specifically highlight a standard prohibition. Similarly, while altitude considerations are essential for safety, performing spins below certain thresholds can depend on the type of training the pilot has received. Each of these scenarios, while they could present risks, do not encapsulate the specific prohibition that extends flight safety regulations as definitively as performing spins with flaps extended does.