Diamond DA 40 Flight Manual page 25

DA 40 AFM
(b) Meteorological Terms
ISA:
MSL:
OAT:
QNH:
Indicated Pressure Altitude:
Pressure Altitude: Altitude above MSL, indicated by a barometric altimeter which is set
Density Altitude:
Wind:
Doc. # 6.01.01-E
International Standard Atmosphere. Conditions at which air is
identified as an ideal dry gas. The temperature at mean sea level is
15 EC (59 °F), air pressure at MSL is 1013.25 hPa (29.92 inHg); the
temperature gradient up to the altitude at which the temperature
reaches -56.5 EC (-69.7 °F) is -0.0065 EC/m (-0.00357 °F/ft), and
above this 0 EC/m (0 °F/ft).
Mean Sea Level.
Outside Air Temperature.
Theoretical atmospheric pressure at MSL, calculated from the
elevation of the measuring point above MSL and the actual
atmospheric pressure at the measuring point.
Altitude reading with altimeter set to 1013.25 hPa (29.92 inHg).
to 1013.25 hPa (29.92 inHg). The Pressure Altitude is the Indicated
Pressure Altitude corrected for installation and instrument errors.
In this Airplane Flight Manual altimeter instrument errors are regarded
as zero.
Altitude in ISA conditions at which the air density is equal to the
current air density.
The wind speeds which are shown as variables in the diagrams in
this manual should be regarded as headwind or downwind
components of the measured wind.
Rev. 8 01-Dec-2010
General
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