ATSEP-BASIC-METEOROLGY (BAS-MET)
Why is Meteorology important for aviation? - Answers- Meteorological service for
safety, regularity and efficiency of international air navigation
Does pressure increase or decrease when climbing ? - Answers- It decreases because
more atmosphere is below us when we climb up.
At sea level: How much weight does 1 cubic metre of air have ? - Answers- 1 kg
Why does an aeronoid barometer have a vacuum in its vacuum chamber ? - Answers-
Because air would underly changes in temperature and therefore cause inaccuracy
What is the atmospheric standard pressure ? (ICAO) - Answers- 1013.25 hPa
What is the atmospheric standard temperature according to ICAO ? - Answers- 15°C
is the atmospheric standard humidity according to ICAO ? - Answers- 0%
What does MSL mean ? - Answers- Mean Sea Level
How does temperature affect the air density and pressure ? - Answers-
How does the true altitude change during a flight from high to low pressure when using
a constant subscale setting ? - Answers- Altitude will decrease. There's a saying that
goes like: From high to low look out below. If you don't adjust your altimeter you might
just hit a mountain.
What is QFE ? - Answers- It s the Pressure at Field Elevation (ELEV). If you set your
altimeter to QFE it will show 0 ft if you're standing on the field.
What is the barometric lapse rate at sea level with ISA-conditions ? - Answers- 30ft/1
hPa
What is QNH ? - Answers- It's the estimated sea level pressure based on the measured
QFE with 30ft/1hPa under ISA-Conditions
If QNH = 1011 hPa and QFE = 1007 hPa how high is the elevation difference between
both locations under ISA-Conditions ? - Answers- 120 ft -> 1011 hPa - 1007 hPa = 4
hPa
30ft / 1hPa means 120 ft / 4hPa
Why do we use QNH ? - Answers- We use it to be independent from ground pressure.
, Whats the indication on Runway (RWY) when you set the altimeter to QFE ? -
Answers- 0
Fill in the table. - Answers- Solution:
Subscalesetting, Indication on RWY, Indication on flight
QFE,0,HGT
QNH,ELEV,ALT
1013 hPa,QNE,FL/PL/Press.Alt.
Why do we use FlightLevel if there are different pressure values in different areas and
we don't get the correct altitude by dialing in one fixed value (flightLevel 1013.25 hPa is
set) - Answers- Because everybody has the same margin of error therefore it's good
enough for seperation and aircraft won't crash, which is a good thing to be honest.
Unit of temperature ? - Answers- °C
Unit of pressure ? - Answers- hPa
Unit of Visibility ? - Answers- m or km
Unit of cloud height ? - Answers- ft
Unit of cloud amount ? - Answers- oktas
Unit of wind speed - Answers- kt (knots)
Unit of wind direction ? - Answers- ° (true north)
Unit of relative humidity ? - Answers- %
Instrument used for temperature ? - Answers- thermometer
Instrument used for pressure ? - Answers- barometer
Instrument used for visibility ? - Answers- transmissiometer
Instrument used for cloud height ? - Answers- ceilometer
Instrument used for cloud amount ? - Answers- visual / ceilometer
Instrument used for wind speed ? - Answers- rotation anemometer
Instrument used for wind direction ? - Answers- wind vane (wind sock)
Instrument used for relative humidity ? - Answers- hygrometer
Why is Meteorology important for aviation? - Answers- Meteorological service for
safety, regularity and efficiency of international air navigation
Does pressure increase or decrease when climbing ? - Answers- It decreases because
more atmosphere is below us when we climb up.
At sea level: How much weight does 1 cubic metre of air have ? - Answers- 1 kg
Why does an aeronoid barometer have a vacuum in its vacuum chamber ? - Answers-
Because air would underly changes in temperature and therefore cause inaccuracy
What is the atmospheric standard pressure ? (ICAO) - Answers- 1013.25 hPa
What is the atmospheric standard temperature according to ICAO ? - Answers- 15°C
is the atmospheric standard humidity according to ICAO ? - Answers- 0%
What does MSL mean ? - Answers- Mean Sea Level
How does temperature affect the air density and pressure ? - Answers-
How does the true altitude change during a flight from high to low pressure when using
a constant subscale setting ? - Answers- Altitude will decrease. There's a saying that
goes like: From high to low look out below. If you don't adjust your altimeter you might
just hit a mountain.
What is QFE ? - Answers- It s the Pressure at Field Elevation (ELEV). If you set your
altimeter to QFE it will show 0 ft if you're standing on the field.
What is the barometric lapse rate at sea level with ISA-conditions ? - Answers- 30ft/1
hPa
What is QNH ? - Answers- It's the estimated sea level pressure based on the measured
QFE with 30ft/1hPa under ISA-Conditions
If QNH = 1011 hPa and QFE = 1007 hPa how high is the elevation difference between
both locations under ISA-Conditions ? - Answers- 120 ft -> 1011 hPa - 1007 hPa = 4
hPa
30ft / 1hPa means 120 ft / 4hPa
Why do we use QNH ? - Answers- We use it to be independent from ground pressure.
, Whats the indication on Runway (RWY) when you set the altimeter to QFE ? -
Answers- 0
Fill in the table. - Answers- Solution:
Subscalesetting, Indication on RWY, Indication on flight
QFE,0,HGT
QNH,ELEV,ALT
1013 hPa,QNE,FL/PL/Press.Alt.
Why do we use FlightLevel if there are different pressure values in different areas and
we don't get the correct altitude by dialing in one fixed value (flightLevel 1013.25 hPa is
set) - Answers- Because everybody has the same margin of error therefore it's good
enough for seperation and aircraft won't crash, which is a good thing to be honest.
Unit of temperature ? - Answers- °C
Unit of pressure ? - Answers- hPa
Unit of Visibility ? - Answers- m or km
Unit of cloud height ? - Answers- ft
Unit of cloud amount ? - Answers- oktas
Unit of wind speed - Answers- kt (knots)
Unit of wind direction ? - Answers- ° (true north)
Unit of relative humidity ? - Answers- %
Instrument used for temperature ? - Answers- thermometer
Instrument used for pressure ? - Answers- barometer
Instrument used for visibility ? - Answers- transmissiometer
Instrument used for cloud height ? - Answers- ceilometer
Instrument used for cloud amount ? - Answers- visual / ceilometer
Instrument used for wind speed ? - Answers- rotation anemometer
Instrument used for wind direction ? - Answers- wind vane (wind sock)
Instrument used for relative humidity ? - Answers- hygrometer
