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vY: Bestrate-of-climb speed.
1.11.2. Meteorological Terms
ISA: International Standard Atmosphere at which air is identified as a dry gas. The temperature at mean sea level is 15° C (59° F), the air pressure at sea level is 1013.25 mbar (29.92 inHg), the temperature gradient up to the altitude at which the temperature reaches -56.5° C (-67.9° F) is -0.0065° C/m (-0.0036° F/ft) and 0° C/m (0° F/ft) above.
OAT: Outside air temperature.
AGL: Above Ground Level.
Indicated Pressure Altitude:
Altitude reading with altimeter set to 1013.25 mbar (29.92 inHg) air pressure. Pressure Altitude: Altitude measured at standard pressure at MSL (1013.25 mbar / 29.92 inHg) using a barometric altimeter. Pressure altitude is the indicated altitude corrected for installation and instrument errors. Within this manual the instrument errors are assumed to be zero. Aerodrome/Airport Pressure: Actual atmospheric pressure at the aerodrome/airport altitude. Wind: The wind speeds used in the diagrams in this manual should be referred to as headwind or tailwind components of the measured wind.
1.11.3. Powerplant
Take-off Power: Maximum engine power for take-off. Maximum Continuous Power: Maximum permissible continuous engine output power during flight.
1.11.4. Flight Performance and Flight Planning
Demonstrated Crosswind Component: The maximum speed of the crosswind component at which the manoeuvrability of the airplane during take-off and landing has been demonstrated during type certification test flights. Service Ceiling: The altitude at which the maximum rate of climb is 0.5 m/s (100 ft/min.).
1.11.5. Weight and Balance
Reference Datum (RD): An imaginary vertical plane from which all horizontal distances for the center of gravity calculations are measured. It is the plane through the leading edge of the wing root rib, perpendicular to the longitudinal axis of the airplane. Station: A defined point along the longitudinal axis which is generally presented as a specific distance from the reference datum. Lever Arm: The horizontal distance from the reference datum to the center of gravity (of a component). Moment: The weight of a component multiplied by its lever arm. Center of Gravity (CG): Point of equilibrium for the airplane weight.
CG position: Distance from the reference datum to the CG. It is determined by dividing the total moment (sum of the individual moments) by the total weight. Center of Gravity Limits: The CG range which an airplane with a given weight must be operated within. Usable Fuel: The amount of fuel available for the flight plan calculation. Unusable Fuel: The amount of fuel remaining in the tank, which cannot be safely used in flight. Empty Weight: Weight of the airplane including unusable fuel, all operating fluids and maximum amount of oil. Useful Load: The difference between take-off weight and empty weight. Maximum Take-off Weight: Maximum weight permissible for take-off.
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