The altimeter is an instrument that measures altitude and is used to determine whether level flight is being maintained. If altitude is being lost or gained, the nose of the airplane should be moved up or down in relation to the horizon, and then the altimeter should be checked to determine if altitude is being maintained. Pushing forward or pulling back on the control yoke moves the nose up or down. The control yoke is also called a control wheel or control stick. In some airplanes, it is a stick that can be moved right or left and forward or back.
Straight flight means flying in a constant heading, or direction.
You should form an imaginary line by selecting two or more reference points, like roads, towns, or lakes, that are directly ahead of the airplane. Then keep the airplane headed along that line. The wings should be kept level by using the ailerons. The ailerons are controlled by turning the control yoke left or right. To turn the airplane, you must turn the control yoke, or wheel, while pressing the appropriate rudder pedal with your foot.