Pick up the correct statement from the following: A. Approach zone survey is carried out to determine the elevations of the protruding obstructions above horizontal, conical and transitional surfaces B. The wind data of an air port is depicted in the form of a chart known as wind rose C. The landing and takeoff of the air craft is made against the wind direction D. All the above

The correct answer is D. All the above.

• Approach zone survey is carried out to determine the elevations of the protruding obstructions above horizontal, conical and transitional surfaces. This is done to ensure that the aircraft has a safe approach to the runway.
• The wind data of an air port is depicted in the form of a chart known as wind rose. This chart shows the direction and speed of the wind at different times of the day.
• The landing and takeoff of the air craft is made against the wind direction. This is done to reduce the ground speed of the aircraft and make it easier to control.

Here are some additional details about each option:

• Approach zone survey: This survey is conducted to determine the elevations of the protruding obstructions above horizontal, conical and transitional surfaces. The horizontal surface is the ground surface at the end of the runway. The conical surface is a surface that slopes upward from the ground surface at a rate of 1:20. The transitional surface is a surface that slopes upward from the conical surface at a rate of 1:50. The purpose of the approach zone survey is to ensure that the aircraft has a safe approach to the runway.
• Wind rose: A wind rose is a graphical representation of the wind speed and direction at a particular location. The wind rose is typically drawn as a circle with the wind direction represented by the spokes of the circle. The length of each spoke is proportional to the wind speed. The wind rose can be used to determine the prevailing wind direction and speed, as well as the frequency of winds from different directions.
• Landing and takeoff: The landing and takeoff of an aircraft is made against the wind direction. This is done to reduce the ground speed of the aircraft and make it easier to control. The ground speed of an aircraft is the speed of the aircraft relative to the ground. The ground speed is affected by the wind speed and direction. When the aircraft is landing or taking off, the wind speed and direction can have a significant impact on the ground speed of the aircraft. By landing and taking off against the wind, the aircraft can reduce its ground speed and make it easier to control.