Pilot’s Operating Handbook Section 1
EXTRA 500 General
Propeller Speed
(N2) Gauge
The propeller speed indicator is the instrument used to identif
the rotational speed of the propeller. The propeller speed is
sensed via the power turbine gear train by a tach-generator an
converted into an indication of RPM output.
1.5.e Airplane Performance and Flight Planning Terminology
Climb
Gradient
The demonstrated ratio of the change in height during a portion
of a climb, to the horizontal distance traversed in the same time
interval.
Demonstrated
Crosswind
Velocity
The demonstrated crosswind velocity is the velocity of the cross
wind component for which adequate control of the airplane
during takeoff and landing was actually demonstrated during
certification tests.
1.5.f Weight and Balance
Reference
Datum
An imaginary vertical plane from which all horizontal distances
are measured for balance purposes.
Station A location along the airplane fuselage usually given in terms o
distance from the reference datum.
Arm The horizontal distance from the reference datum to the cente
of gravity (C.G.) of an item.
Moment The product of the weight of an item multiplied by its arm.
Center of
Gravity (C.G.)
The point at which an airplane would balance if suspended. Its
distance from the reference datum is found by dividing the total
moment by the total weight of the airplane.
C.G. Arm The arm obtained by adding the airplane’s individual moments
and dividing the sum by the total weight.
C.G. Limits The extreme center of gravity locations within which the
airplane must be operated at a given weight.
Usable Fuel Fuel available for flight planning.
26. January 2011
1-17
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