General Authority of Civil Aviation (GACA) Aeronautical Information Publication (AIP) Practice Exam

How many modes do the flaps and slats operate in?

1. Three modes

2. Two modes

3. Five modes

4. Four modes

The correct answer is: Three modes

Flaps and slats on an aircraft are designed to enhance aerodynamic performance during different phases of flight, particularly during takeoff and landing. The correct answer reflects the fact that flaps and slats typically operate in three distinct modes: the fully retracted position, an intermediate position, and the fully extended position. In their fully retracted position, flaps and slats are stowed to minimize drag during cruise. The intermediate position is often used to provide additional lift without a significant increase in drag, which is critical during the approach to landing or in certain maneuvering conditions. The fully extended position maximizes lift at lower speeds, facilitating safer takeoff and landing operations. Thus, recognizing that these components can transition between these three distinct configurations for optimal flight performance clarifies why three modes is the appropriate answer.