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distance is attained per unit of altitude lost with power off.
VO Operating Maneuvering Speed is the maximum speed at
which application of full control movement will not
overstress the airplane.
VFE Maximum Flap Extended Speed is the highest speed
permissible with wing flaps in a prescribed extended
position.
VNO Maximum Structural Cruising Speed is the speed that
should not be exceeded except in smooth air, and then
only with caution.
VNE Never Exceed Speed is the speed that may not be
exceeded at any time.
VPD Maximum Demonstrated Parachute Deployment Speed is
the maximum speed at which parachute deployment has
been demonstrated.
VS Stalling Speed is minimum steady flight speed at which
the aircraft is controllable.
VS 50% Stalling Speed is minimum steady flight speed at which
the aircraft is controllable with 50% flaps.
March 2010
1-10 Information Manual
Section 1 Cirrus Design
General SR22
Meteorological Terminology
VSO Stalling Speed is the minimum steady flight speed at
which the aircraft is controllable in the landing
configuration (100% flaps) at the most unfavorable weight
and balance.
VX Best Angle of Climb Speed is the speed at which the
airplane will obtain the highest altitude in a given
horizontal distance. The best angle-of-climb speed
normally increases slightly with altitude.
VY Best Rate of Climb Speed is the speed at which the
airplane will obtain the maximum increase in altitude per
unit of time. The best rate-of-climb speed decreases
slightly with altitude.
IMC Instrument Meteorological Conditions are meteorological
conditions expressed in terms of visibility, distance from
cloud, and ceiling less than the minima for visual flight
defined in FAR 91.155.
ISA International Standard Atmosphere (standard day) is an
atmosphere where (1) the air is a dry perfect gas, (2) the
temperature at sea level is 15°C, (3) the pressure at sea
level is 29.92 in.Hg (1013.2 millibars), and (4) the
temperature gradient from sea level to the altitude at
which the temperature is -56.5°C is -0.00198°C per foot
and zero above that altitude.
MSL Mean Sea Level is the average height of the surface of the
sea for all stages of tide. In this Handbook, altitude given
as MSL is the altitude above the mean sea level. It is the
altitude read from the altimeter when the altimeter’s
barometric adjustment has been set to the altimeter
setting obtained from ground meteorological sources.
OAT Outside Air Temperature is the free air static temperature
obtained from inflight temperature indications or from
ground meteorological sources. It is expressed in either
degrees Celsius or degrees Fahrenheit.
March 2010
Cirrus Design Section 1
SR22 General
Information Manual 1-11
Engine Power Terminology
Performance and Flight Planning Terminology
• Pressure Altitude is the altitude read from the altimeter
when the altimeter’s barometric adjustment has been set
to 29.92 in.Hg (1013 mb) corrected for position and
instrument error. In this Handbook, altimeter instrument
errors are assumed to be zero.
• Standard Temperature is the temperature that would be
found at a given pressure altitude in the standard
atmosphere. It is 15°C (59°F) at sea level pressure altitude
and decreases approximately 2°C (3.6°F) for each 1000
feet of altitude increase. See ISA definition.
HP Horsepower is the power developed by the engine.
MCP Maximum Continuous Power is the maximum power that
can be used continuously.
MAP Manifold Pressure is the pressure measured in the
engine’s induction system expressed as in. Hg.
RPM Revolutions Per Minute is engine rotational speed.
• Static RPM is RPM attained during a full-throttle engine
runup when the airplane is on the ground and stationary.
g One “g” is a quantity of acceleration equal to that of earth’s
gravity.
• Demonstrated Crosswind Velocity is the velocity of the
crosswind component for which adequate control of the
airplane during taxi, takeoff, and landing was actually
demonstrated during certification testing. Demonstrated
crosswind is not considered to be limiting.
• Service Ceiling is the maximum altitude at which the
aircraft at maximum weight has the capability of climbing
at a rate of 100 feet per minute.
GPH Gallons Per Hour is the amount of fuel (in gallons)
consumed by the aircraft per hour.
March 2010
1-12 Information Manual
Section 1 Cirrus Design
General SR22
Weight and Balance Terminology
　
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