China Civil UAV Theory Questions — Questions 1052–1061

See the reference chart.

See the reference chart.

See the reference chart.

If the ground slopes upward, that is, the ground farther from the runway threshold is at a lower elevation and rises gradually toward the runway edge, the pilot will perceive the approach angle as looking higher. Conversely, if the ground slopes downward, that is, the ground farther from the runway threshold is at a higher elevation and falls gradually toward the runway edge, the pilot will perceive the approach angle as looking lower. In practice, the first case is considered more dangerous: because of the higher illusion, the pilot will deliberately lower the approach angle, which can cause a low approach speed and even the dangerous action of touching down before the runway threshold.

Study note: bank right, press left; bank left, press right. With a right bank, the aircraft needs to roll left, achieved by pressing left or returning the stick. Option A, pushing the stick forward, deflects the elevator downward, pitching the nose down and lowering the pitch angle. Option B, returning the stick or pressing left, operates the ailerons to return to level or roll left, correcting the bank. Option C, pressing right, operates the ailerons to roll right, increasing the right bank.

Study note: bank right, press left; bank left, press right. With a left bank, the aircraft needs to roll right, achieved by pressing right or returning the stick. Option A, pushing the stick forward, deflects the elevator downward, pitching the nose down and lowering the pitch angle. Option B, pressing left, operates the ailerons to roll left, increasing the left bank. Option C, returning the stick or pressing right, operates the ailerons to return to level or roll right, correcting the bank.

Study note: deviation right, correct left; deviation left, correct right. A heading deviating to the right needs a left yaw correction, achieved by twisting the rudder left. Option A, pushing the stick forward, deflects the elevator downward, pitching the nose down and lowering the pitch angle. Option B, twisting the rudder left, deflects the rudder left, yawing the nose left. Option C, twisting the rudder right, deflects the rudder right, yawing the nose right.

Study note: deviation right, correct left; deviation left, correct right. A heading deviating to the left needs a right yaw correction, achieved by twisting the rudder right. Option A, pushing the stick forward, deflects the elevator downward, pitching the nose down and lowering the pitch angle. Option B, twisting the rudder left, deflects the rudder left, yawing the nose left. Option C, twisting the rudder right, deflects the rudder right, yawing the nose right.

A climb rate that is too small means the aircraft's rate of climb is insufficient. Increasing the pitch angle (raising the nose) increases the aircraft's angle of attack and thus its lift. This helps increase the climb rate, making the aircraft climb faster.

If the aircraft's speed decreases too much, lift may fall, endangering flight safety. To maintain enough flight speed to produce the necessary lift, the pitch angle must be decreased (letting the nose pitch down), so that more of the airspeed component lies along the flight direction, increasing horizontal flight speed.