What is the Reverse Command concept in helicopters?

The Reverse Command concept in helicopters refers to a situation where an increase in power, particularly in the context of a specific flight state such as slow flight or descending flight, can lead to a decrease in altitude rather than an increase. This phenomenon occurs primarily because of the aerodynamic characteristics of helicopters, especially when they are operating at low airspeeds or within certain range configurations.

In such conditions, if the pilot increases engine power, it may not translate into a gain in altitude as one might expect. Instead, the increased power can actually cause the helicopter to descend if collective pitch changes do not appropriately compensate for the increased thrust produced. Essentially, in reverse command, the pilot must be particularly aware of the helicopter's performance characteristics, as the dynamics can lead to an unexpected descent when power is increased, making it critical for effective flight management.

This understanding is essential for pilots as it influences how they handle the helicopter during various phases of flight, especially when operating close to the ground or in reduced-speed scenarios. Recognizing the reverse command phenomenon allows pilots to make informed decisions, enhancing safety and the effectiveness of flight operations.