What is the minimum altitude at which spoilers can be extended in flight with flap settings greater than 30°?

The minimum altitude at which spoilers can be extended in flight with flap settings greater than 30° is indeed 300 ft. This limitation exists to ensure safe flight operations, particularly during critical phases of flight such as approach and landing.

Operating with the spoilers engaged at lower altitudes could lead to an undesirable reduction in lift, which is particularly significant when high flap settings are used since the aircraft is configured for slower speeds and steeper angles of descent. By restricting the use of spoilers until reaching 300 ft, the manufacturer ensures that pilots maintain adequate control and lift during these critical landing phases. Furthermore, this altitude limit helps to mitigate risks associated with potential aerodynamic imbalances that spoiler deployment could introduce when significant lift is already being managed by the high flap configuration.

Understanding these limits is essential for safe aircraft operation, especially for flight crews operating in various conditions where such configurations are necessary for approach and landing.