9
Airplane Performance and Flight Planning Terminology
Velocity
is the velocity of the crosswind component for which adequate control of the airplane
during takeoff and landing is guaranteed
is the fuel available for flight planning
is the quantity of fuel that cannot be safely used in flight
is the acceleration of gravity
is the takeoff distance measured from actual start to wheel lift off point
is total takeoff distance measured from start to clearing a 50’ obstacle
is the distance measured during landing from actual touchdown to stop point
is the distance measured during landing, from clearing a 50’ obstacle to actual stop
is specific range, that is, the distance (in nautical miles) which can be expected at a
specific power setting and/or flight configuration per gallon of fuel used
Weight and Balance Terminology
“Reference datum” is an imaginary vertical plane from which all horizontal
distances are measured for balance purposes
is the horizontal distance from the reference datum to the center of gravity
(C.G.) of an item
is the product of the weight of an item multiplied by its arm
Center of Gravity is the point at which the airplane, or equipment, would
balance if suspended. Its distance from the reference datum is found by
dividing the total moment by the total weight of the airplane
Empty Weight is the weight of the airplane with engine fluids and oil at
operating levels
is the difference between takeoff weight and the empty weight
is the maximum weight approved for the start of the takeoff run
is the maximum weight approved for the landing touch down
is the weight of chocks, blocks, stands, etc. used when weighing an airplane,
and is included in the scale readings; tare is then deducted from the scale
reading to obtain the actual (net) airplane weight
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