What is the maximum altitude permitted to extend the landing gear?

The maximum altitude permitted to extend the landing gear is 18,000 feet. This altitude is specified because it aligns with standard operational procedures for the majority of aircraft, ensuring safe and consistent handling during critical phases of flight.

At altitudes above 18,000 feet, the decrease in air density can affect the performance of the landing gear system, which is designed to operate optimally at lower altitudes where the air pressure is adequate for reliable extension and retraction. Extending the landing gear at higher altitudes could potentially lead to issues such as inadequate aerodynamic performance and difficulty in maintaining control of the aircraft, as the aerodynamic characteristics change with reduced air density.

Therefore, adhering to the operational limitations regarding landing gear extension is crucial for maintaining aircraft safety and performance.