Meteorological Terminology; Engine Power Terminology - Cessna 172R Operating Handbook

CESSNA
MODEL 172R

METEOROLOGICAL TERMINOLOGY

Outside Air Temperature is the free air static
temperature.
Celsius or degrees Fahrenheit.
Standard Standard Temperature is
Temperature pressure altitude and decreases by 2°C for each
1 000
Pressure
Pressure Altitude is the altitude read from an
Altitude altimeter when the altimeter's barometric scale has
been

ENGINE POWER TERMINOLOGY

BHP
Brake Horsepower is
engine.
RPM
Revolutions Per Minute is engine speed.
Static Static RPM is engine speed attained during a
RPM throttle engine runup when the airplane is on the
ground and stationary.
MAP
Manifold Absolute Pressure is the absolute
pressure measured in the engine induction
MAP is measured in units of inches of mercury
(inHG).
Lean Decreased proportion of fuel in the fuel-air mixture
Mixture supplied
the amount of fuel required by the engine decreases
for
mixture
as "leaning" the mixture.
Rich Increased proportion
Mixture
supplied to the engine. As air density increases, the
amount of fuel required by
a given throttle setting. Adjusting the fuel-air mixture
to provide a greater portion of fuel is known as
"richening" the mixture.
Full Rich Mixture control full forward
travel, toward the panel).
Idle Cutoff
Mixture control full aft (pulled
away from the panel).
Revision
8
It may be expressed in either degrees
feet of altitude.
inches of mercury (1013 mb).
set to 29.92
the engine. As air density decreases,
to
a given throttle setting.
to provide a smaller
sea level
5°C at
1
the power developed by the
Adjusting the fuel-air
portion of fuel
of fuel in the fuel-air mixture
the engine
(pushed in,
out, full control travel,.
SECTION 1
GENERAL
full
system.
is known
increases for
full control
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