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Aircraft Meteorological Data Relay: Aircraft Meteorological data Reporting

Clear Air Turbulence (CAT)

Usually, high level (or jet stream) turbulence encountered in air where no clouds are present; may occur in non-convective clouds

Low level Turbulence (LLT)

In the 12-5 LLT is defined as turbulence which occurs primarily within the atmospheric boundary layer.

Mountain Wave Turbulence (MWT)

Turbulence produced in conjuction with lee waves

Carburetor Icing

The formation of ice in the throat of a carburetor when moist air draw into the carburetor is cooled to the frost point. Often detrimental to engine operation.

Clear Ice

The formation of a layer of hard, smooth, glossy ice on an aircraft. Clear ice is relatively transparent or translucent; synonymous with glaze. Clear ice is heavy and difficult to remove. Compare with rime icing, runback icing. In 3-6, clear ice is defined as it forms when droplets impacting an airplane freeze slowly, spreading over the aircraft components.

Rime Ice

The formation of a white or milky and opaque granular deposit of ice on an aircraft. most common (colder temperatures)

Supercooled Water Droplets

Liquid cloud or precipitation droplets at subfreezing temperatures.

Steam Fog

In 6-11 Steam fog is defined as when very cold, dry air moves over warm water, air very close to the surface picks up water vapor from the strong evaporation

Slant Range Visibility

This is the oblique distance at which you can see landing aids, such as runway lights and markings.

Turbulence in which an aircraft is tossed violently and is practically impossible to control is called...


Maneuvering Speed

An airplane needs to reduce to maneuvering speed when in turbulence.

What speed is used if the turbulence is severe?

Aircraft Maneuvering Speed

Turbulence Intensity

Light, Moderate, Severe, Extreme

What type of icing occurs for temperature below freezing?

Rime Ice

Rime Ice

is easier to remove than clear ice. forms at colder temperatures

Ice that could occur well above freezing is

Vaporization of fuel in carburetor. Evaporation, vaporization, if there is moisture in the air, it will freeze.

Induction icing could occur to an aircraft that

doesn't have a carburetor

Induction icing

close to carburetor has to occur below freezing (air enters the aircraft)

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