China Civil UAV Theory Questions — Questions 992–1001

UAV-Q0992. When a remote-control UAV lands and faces a high flare, the correct operation is

Explanation

A flare ending above 0.5 m in height is a high flare. Correction method: (1) During the flare, on discovering a high-flare tendency, stop pulling or decrease the pull and let the aircraft sink. Based on the aircraft's height above ground, sink rate, and pitch attitude, pull the stick gently and evenly so the aircraft enters the float at 0.5 m in height. (2) For a high flare, if the aircraft then sinks, hold the stick steady, wait until it sinks to 0.5 m, then gently pull the stick and make a normal landing. (3) For a high flare, if the aircraft does not sink, ease the stick slightly (noting that the throttle is fully closed) so the aircraft sinks slowly to 0.5 m, then make a normal landing. (4) If the flare height is above 3 m and is not corrected in time, go around.

UAV-Q0993. When a remote-control UAV lands with a quartering headwind

Explanation

In a quartering headwind landing, ground speed decreases, and the timing for closing the throttle, descending, and the fourth turn should be delayed, or the fourth-turn bank reduced.

UAV-Q0994. When a remote-control UAV lands with a quartering tailwind

Explanation

In a quartering tailwind landing, ground speed increases, and the timing for closing the throttle, descending, and the fourth turn should be advanced, or the fourth-turn bank increased.

UAV-Q0995. When a remote-control UAV lands, if the nose-down angle before the flare is large and the descent is fast, the pilot should

Explanation

If the nose-down angle is large and the descent is fast, flaring at the normal timing would flare too low, so the stick must be pulled earlier.

UAV-Q0996. When a remote-control UAV lands, the basic points for closing the throttle are

Explanation

The basic points for closing the throttle on landing are: (1) timely, (2) gentle, (3) even.

UAV-Q0997. When a remote-control UAV lands, if the throttle is closed too late and too finely, the speed decreases slowly, so the flare speed is high and the aircraft sinks slowly

Explanation

Closing the throttle too late and too finely makes the speed decrease slowly, so the flare speed is high and the aircraft sinks slowly. This easily produces a high flare, and in the float the speed provides large lift with a small pitch angle (small lift coefficient).

UAV-Q0998. When a remote-control UAV lands, if the throttle is closed too early and too coarsely, the speed decreases quickly, so the flare speed is low and the aircraft sinks fast

Explanation

Closing the throttle too early makes the speed decrease quickly, so the flare speed is low and a low flare easily results. In the float, a larger angle of attack is needed to obtain enough lift, giving a large pitch angle (large lift coefficient).

UAV-Q0999. When a remote-control UAV lands, in which case should the throttle be closed appropriately earlier and the closing action appropriately faster?

Explanation

Cases requiring earlier throttle closure: (1) the actual descent point is ahead of the planned descent point; (2) the current height is above the planned height; (3) speed is high and sink is slow; (4) a strong tailwind.

UAV-Q1000. When a remote-control UAV lands, in which case should the throttle be closed appropriately earlier and the closing action appropriately faster?

Explanation

Cases requiring earlier throttle closure: (1) the actual descent point is ahead of the planned descent point; (2) the current height is above the planned height; (3) speed is high and sink is slow; (4) a strong tailwind.

UAV-Q1001. When a remote-control UAV lands, in which case should the throttle be closed appropriately earlier and the closing action appropriately faster?

Explanation

Cases requiring earlier throttle closure: (1) the actual descent point is ahead of the planned descent point; (2) the current height is above the planned height; (3) speed is high and sink is slow; (4) a strong tailwind.