Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.

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4
	5																					6
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8				9
			10												11
	12											13
14				15
												16					17			18
19						20			21
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24			25
						26			27
	28				29									30	31			32
33											34
35								36
			37								38

 Check 

Across: 1. The understructure of an airplane which supports the airplane on land or water: wheels, skis or pontoons. Retractable gear folds up into the airplane in flight. Gear that does not retract is called "fixed." 4. A mechanically-drive, fixed-wing, heavier-than-air craft. 5. Control surfaces hinged to the horizontal stabilizer which control the pitch of the airplane, or the position of the nose of the airplane relative to the horizon. 7. The part of the airplane to which the rudder and elevators are attached. The tail has vertical and horizontal stabilizers to keep the airplane from turning about its lateral axis. 8. An airfoil which an engine turns to provide the thrust, pulling the airplane through the air. 10. Speed. 13. Forward force. 14. A vertical attachment to the tail of an aircraft which provides directional stability. Same as vertical stabilizer. 15. The vertical distance from a given level (sea level) to an aircraft in flight. 18. Part of the airplane shaped like an airfoil and designed in such a way to provide lift when air flows over it. 19. Height above ground of cloud base. 21. Distance toward the horizon that objects can be seen and recognized. Smoke, haze, fog, and precipitation hinder visibility. 22. A tract of land or water for the landing and takeoff of aircraft. Facilities for shelter, supply and repair are usually found there. 23. The act of making the airplane descend, lose flying speed, and make contact with the ground or water, thus ending the flight. 24. A measure of speed, one knot being one nautical mile per hour. 26. The part of the flight during which the airplane gains flying speed and becomes airborne. 28. A surface of area on the airport designated for airplanes to take off and land. 30. An aeronautical map showing information of use to the pilot in going from one place to another. 35. Control surface hinged to the back of the vertical fin. 36. Person who controls the airplane. 37. Hinged or pivoted airfoils forming part of the trailing edge of the wing and used to increase lift at reduced airspeed. 38. An instrument indicating direction.

Down: 2. An instrument for measuring in feet the height of the airplane above sea level. 3. Beamed radio waves for detecting and locating objects. The objects are "seen" on a screen or scope. 6. An object shaped to make air flow smoothly around it. 9. The height above sea level of a given land prominence, such as airports, mountains, etc. 11. The streamlined body of an airplane to which are fastened the wings and tail. 12. Control surfaces hinged at the back of the wings which by deflecting up or down help to bank the airplane. 16. An upward force cased by the rush of air over the wings, supporting the airplane in flight. 17. The reduction of speed to the point where the wing stops producing lift. 18. Air in motion, important to aviation because it influences flight to a certain degree. 20. Force toward the center of the earth. 25. Maneuver which the airplane makes changing its direction of flight. 27. The part of the airplane which provides power, or propulsion, to pull the airplane through the air. 29. An air route marked by aids to air navigation, such as beacons, radio ranges and direction-finding equipment, and along which airports are located. 31. Building at the airport in which airplanes are stored or sheltered. 32. To operate an airplane under its own power; other than in actual take off or landing. 33. The component of the total air force on a body parallel to relative wind and opposite to thrust. 34. A push or pull exerted on an object.