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GS281 MET > General MET Knowledge > Flashcards

General MET Knowledge Flashcards

1
Q

What does ISA stand for?

A

International Standard Atmosphere

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2
Q

What does OAT stand for?

A

Outside Air Temperature

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3
Q

What are the 5 Main Layers of the Atompshere?

A
  • Troposphere (Lowest)
  • Stratosphere
  • O Zone (In Stratosphere)
  • Mesosphere
  • Thermosphere (Highest)
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4
Q

What is the Temperature at the Top of the Troposphere?

A

-56.5 Celsius

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5
Q

What is the ISA Sea Level Temperature?

A

15 Celsius

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6
Q

What is the ISA Rate of Change of Temperature (Lapse Rate)?

A

1.98 Celsius per 1000ft
2 Celsius for calculations

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7
Q

What is an Adiabatic Atmosphere?

A

An Atmosphere which changes with temperature

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8
Q

What % of Water Vapour is in the Troposphere?

A

99%

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9
Q

What is Dry Air Composed of?

A
  • 78% Nitrogen
  • 21% Oxygen
  • 1% Other Gases
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10
Q

What are the Other Gases that make up Dry Air?

A
  • Carbon Dioxide
  • Carbon Monoxide
  • Argon
  • Hydrogen
  • O Zone
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11
Q

What % of the Atmosphere is Water Vapour at Low Levels?

A

4%

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12
Q

Where is 1/2 of the Mass of Water Vapour?

A

Below 1.5km

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13
Q

In ISA Conditions, where is the Tropopause? And what is the Temperature?

A

36090ft
-56.5 Celsius

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14
Q

What happens to Temperature in the Tropopause?

A

It no longer decreases with temperature

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15
Q

In Real World Conditions, what happens with the Tropopause?

A

It changes height with seasons, location and the temperature of the surface. It can be as high as 65,000ft around the equator

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16
Q

Where are Jet Streams Found?

A

Just below the tropopause

17
Q

Where is most of the O Zone Layer Found?

A

90% is between 20 and 30km

18
Q

What does the O Zone Layer do?

A

It absorbs short wave (UV) radiation, and causes the temperature increase in the stratosphere. It contains toxic gases and causes a decrease in cabin air quality

19
Q

What is ISA Sea Level Pressure

A

1013.25hPa or 29.92 InHg (Inches of Mercury) or 760 mmHg (Millimetres of Mercury)

20
Q

What is the Rate of Change of Temperature through the Atmosphere Known As?

A

Lapse Rate

21
Q

Pressure Lapse Rate

A

1hPa per 30ft (9m)

22
Q

At what Altitude is Pressure Half at AMSL (High Level)? And what is the Pressure?

A

18,000ft and 500hPa

23
Q

What is Air Density at AMSL?

A

1.225Kg/m^3

24
Q

What are Temperature Deviations?

A

Where the actual temperature doesn’t match the ISA temperature for that altitude

25
Q

What does the MTOW have to be Greater than to get Instantaneous Wind Reports?

A

5700kg

26
Q

Does ATIS use True or Magnetic North?

A

Magnetic North

27
Q

Do METAR and SPECI use True or Magnetic North?

A

True North

28
Q
A

GS281 MET (2 decks)

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