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10 Cards in this Set
- Front
- Back
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What temperature does clear ice form?
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0ºC - -10ºC,
and even as cold as -25ºC |
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What temperature does rime ice form?
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Primarily -8ºC - -20ºC,
although it has been observed between -2ºC and -28ºC |
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What are the two basic conditions for icing to form on an airframe?
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1) Aircraft surface temperature must be colder than 0ºC
2) Supercooled water droplets must be present |
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What are the three types of ice accumulation on an aircraft?
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rime ice, clear ice, and frost
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What are the four types of turbulence?
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1) Thermal or convective
2) Mechanical mixing 3) Frontal 4) Wind shear/flow over mountains |
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What is the vertical wind shear criteria for Light Turbulence?
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3-5kts / 1000FT
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What is the vertical wind shear criteria for Moderate Turbulence?
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6-9kts / 1000FT
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What is the vertical wind shear criteria for Severe Turbulence?
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10kts or greater per 1000FT
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What is the criteria for Mountain Wave CAT?
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1) Winds 25knots or more normal to the mountain barriers
2) Presence of Significant surface pressure differences across such barriers |
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What is the criteria for Shear Wave CAT?
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1) Wind speeds of 60kts or more
2) Horizontal shear of 25kts in 90nm 3) Vertical sheat above 15kts per 1,000ft |
