DENSITY ALTITUDE
A Density Altitude Chart is provided to aid in calculation of performance and
limitations.
Density altitude (Hd) is an expression of the density of the air on terms of
height above sea level; therefore, the less dense the air, the higher the density
altitude.
For standard conditions of temperature and pressure, density altitude is the
same as pressure altitude (Hp).
As temperature increases above standard for any altitude, the density altitude
will also increase to values higher then pressure altitude.
The chart shows density altitude as a function of pressure altitude and
temperature.
The chart also enable to obtain the inverse of the square root of the density
ratio (
1
/
' σ
), which is used to calculate the True Airspeed (TAS) by the
relation:
TAS = CAS x
1
/
' σ
where CAS is the Calibrated Airspeed.
RFM A109E
R.A.I. Approved 4-5
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