What is the maximum altitude permitted to extend flaps/slats?

The maximum altitude permitted to extend flaps/slats is 20,000 feet. This altitude limitation is in place to ensure safe aircraft handling and performance during various phases of flight. When flaps and slats are deployed, they alter the aerodynamic properties of the wing, providing additional lift at lower speeds, which is particularly beneficial during descent and landing approaches. However, extending them at higher altitudes can introduce risks such as increased drag and stall characteristics, especially if not managed correctly. Therefore, the aircraft's operating manual designates 20,000 feet as the threshold for flaps/slats extension to maintain safe aerodynamic conditions. This is a critical operational limit that pilots must adhere to in order to ensure the safety and efficiency of their flights.