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13 Cards in this Set
- Front
- Back
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What is Atmospheric Pressure? |
Atmospheric Pressure is due to the force exerted by gravity pulling air particles towards the Earth |
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Describe the relationship between height and air pressure? |
As height increases, air pressure decreases |
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What instrument is used to measure pressure? |
Precision Aneroid Barometer |
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Define Elevation |
The vertical distance of a fixed position above or below Mean Sea Level (MSL) |
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Describe Standard Altimeter Settings |
Average pressure at MSL- 1013.2 hPa or 29.92 inches of Mercury |
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Describe QFE |
The pressure at an airfield, obtained using an aneroid barometer Vertical distance is indicated as height above the Runway |
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Describe QNH |
The pressure at aerodrome level adjusted to Mean Sea Level Achieved by taking the QFE and applying a correction based on the Aerodrome height above Mean Sea Level Vertical distance is indicated as altitude above MSL |
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Describe Regional Pressure Setting (RPS) |
UK airspace is divided into pressure regions known as Altimeter Setting Regions (ASRgn) Aircraft use RPS when transiting below 3000ft (ASML) RPS defined as the lowest forecasted QNH for an ASRgn valid for 1 hour and issued 1 hour ahead. Met office pass RPS to ATC each hour |
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Define Transition Altitude (TA) |
The altitude at or below which the vertical position of an aircraft is controlled by reference ALTITUDE In the UK this is normally 3000ft |
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Define Transition Level (TL) |
The lowest flight level available for use above the Transition Altitude and is at least 1000ft above the TA |
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Define Transition Layer |
The airspace between Transition Altitude and Transition Level Must be at least 1000ft deep |
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Define a Flight Level |
A layer of constant atmospheric pressure above a pressure datum of 1013.2 hPa Flight Levels are numbered 500ft apart |
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Define Minimum Safe Flight Level (MSFL) |
The flight level which provides safe obstacle clearance (1000ft) within a specified distance (25nm) from a facility with the SAS fleet |
