UCT Basic Nav and Weather Test
With Solution
What is the atmosphere? - ANSWER A thin layer of gases surrounding Earth
Troposphere - ANSWER Adjacent to earth's surface
Large amounts of moisture and condensation
Most weather occurs
30,000ft - 60,000ft
Standard lapse rate
Tropopause - ANSWER The boundary between the troposphere and the
stratosphere
Isothermal
Frequently find turbulence, contrails, and haze
36,000 MSL avg height over US
Jet stream
Stratosphere - ANSWER Smooth flying with excellent vis
Temperature inversion
,Atmospheric Pressure - ANSWER Pressure exerted on surface due to weight
of air
Standard: 29.92 or 1013.2
Lapse Rate - ANSWER 2C / 1000ft
1 in-Hg / 1000ft
Indicated Altitude - ANSWER Read from altimeter.
Absolute Altitude - ANSWER the height above ground level (AGL)
True Altitude - ANSWER Actual height above mean sea level (MSL)
Pressure Altitude - ANSWER The height above the standard datum plane.
Density Altitude - ANSWER The pressure altitude corrected for nonstandard
temperature.
Barometric Altimeter - ANSWER Displays altitude in ft instead of pressure
, Altimeter Setting - ANSWER Calibrated for standard lapse rate
Increasing setting increases altimeter readout
Altimeter Pressure Error - ANSWER "High to low, look out below. Low to
high, plenty of sky"
Altimeter Temperature Error - ANSWER Cold air: lower than altimeter read
out
Warm air: higher than altimeter read out
4% error for every 11C from standard temp
Wind - ANSWER Brings about weather changes
Transports water vapor
Gradient Wind: Tight Spacing - ANSWER Steep pressure gradient
Faster winds
Gradient Wind: Wide Spacing - ANSWER Shallow pressure gradient
Slower winds
With Solution
What is the atmosphere? - ANSWER A thin layer of gases surrounding Earth
Troposphere - ANSWER Adjacent to earth's surface
Large amounts of moisture and condensation
Most weather occurs
30,000ft - 60,000ft
Standard lapse rate
Tropopause - ANSWER The boundary between the troposphere and the
stratosphere
Isothermal
Frequently find turbulence, contrails, and haze
36,000 MSL avg height over US
Jet stream
Stratosphere - ANSWER Smooth flying with excellent vis
Temperature inversion
,Atmospheric Pressure - ANSWER Pressure exerted on surface due to weight
of air
Standard: 29.92 or 1013.2
Lapse Rate - ANSWER 2C / 1000ft
1 in-Hg / 1000ft
Indicated Altitude - ANSWER Read from altimeter.
Absolute Altitude - ANSWER the height above ground level (AGL)
True Altitude - ANSWER Actual height above mean sea level (MSL)
Pressure Altitude - ANSWER The height above the standard datum plane.
Density Altitude - ANSWER The pressure altitude corrected for nonstandard
temperature.
Barometric Altimeter - ANSWER Displays altitude in ft instead of pressure
, Altimeter Setting - ANSWER Calibrated for standard lapse rate
Increasing setting increases altimeter readout
Altimeter Pressure Error - ANSWER "High to low, look out below. Low to
high, plenty of sky"
Altimeter Temperature Error - ANSWER Cold air: lower than altimeter read
out
Warm air: higher than altimeter read out
4% error for every 11C from standard temp
Wind - ANSWER Brings about weather changes
Transports water vapor
Gradient Wind: Tight Spacing - ANSWER Steep pressure gradient
Faster winds
Gradient Wind: Wide Spacing - ANSWER Shallow pressure gradient
Slower winds
