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Pilot's Handbook of Aeronautical Knowledge
Weather Theory
Wind and Currents

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Pilot's Handbook of Aeronautical Knowledge



Table of Contents

Chapter 1, Introduction To Flying
Chapter 2, Aircraft Structure
Chapter 3, Principles of Flight
Chapter 4, Aerodynamics of Flight
Chapter 5, Flight Controls
Chapter 6, Aircraft Systems
Chapter 7, Flight Instruments
Chapter 8, Flight Manuals and Other Documents
Chapter 9, Weight and Balance
Chapter 10, Aircraft Performance
Chapter 11, Weather Theory
Chapter 12, Aviation Weather Services
Chapter 13, Airport Operation
Chapter 14, Airspace
Chapter 15, Navigation
Chapter 16, Aeromedical Factors
Chapter 17, Aeronautical Decision Making




Turbulence caused by manmade obstructions.
Figure 11-15. Turbulence caused by man made obstructions.

This same condition is even more noticeable when flying in
mountainous regions. [Figure 11-16] While the wind flows
smoothly up the windward side of the mountain and the
upward currents help to carry an aircraft over the peak of
the mountain, the wind on the leeward side does not act in
a similar manner. As the air flows down the leeward side of
the mountain, the air follows the contour of the terrain and
is increasingly turbulent. This tends to push an aircraft into
the side of a mountain. The stronger the wind, the greater the
downward pressure and turbulence become.

Due to the effect terrain has on the wind in valleys or canyons,
downdrafts can be severe. Before conducting a flight in or
near mountainous terrain, it is helpful for a pilot unfamiliar
with a mountainous area to get a checkout with a mountain
qualified flight instructor.

Turbulence in mountainous regions.
Figure 11-16. Turbulence in mountainous regions.