1. Wheels, skids, or floats that support an aircraft during landing and ground operations

2. Electrical systems and instruments used for communication, navigation, and operation of an aircraft

2. The speed of an aircraft relative to the air surrounding it

3. Ratio of horizontal distance traveled to vertical distance descended in unpowered flight

4. Control surface on the tail of an airplane used to control its pitch or up/down motion

5. A thorough check of an aircraft and its systems prior to taking off

6. Vertical distance of an airplane's position above sea level

7. Unpowered wheel at the rear of an airplane used to support the tail when the aircraft is on the ground

8. A swirling air mass created by the wingtip or trailing edge of an airplane

9. Movement of an airplane on the ground under its own power

10. Very High Frequency Omnidirectional Range - a radio navigation system used by aircraft for guidance

11. Adjustment of control surfaces to maintain balanced flight

12. Asymmetric thrust experienced by a single-engine airplane which causes a yawing motion

13. The path an airplane follows during approach and landing

14. Vertical Speed Indicator - an instrument that shows the rate of climb or descent of an aircraft

15. Rotating device used to create thrust in small airplanes

16. Hinged control surfaces on the wings that are used to control an airplane's roll or banking motion