Tecnam P92 Echo MK2 - Page 11

P92 LSA
Flight Manual
Rev.0
11
Airplane Performance and Flight Planning Terminology
Crosswind
Velocity
is the velocity of the crosswind component for which adequate control of the airplane
during takeoff and landing is guaranteed
Usable fuel
is the fuel available for flight planning
Unusable fuel
is the quantity of fuel that cannot be safely used in flight
g
is the acceleration of gravity
Weight and Balance Terminology
Datum
“Reference datum” is an imaginary vertical plane from which all horizontal
distances are measured for balance purposes
Arm
is the horizontal distance from the reference datum to the center of gravity
(C.G.) of an item
Moment
is the product of the weight of an item multiplied by its arm
C.G.
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
Empty Weight is the weight of the airplane with engine fluids and oil at
operating levels
Useful Load
is the difference between takeoff weight and the empty weight
Maximum Takeoff Weight
is the maximum weight approved for the start of the takeoff run
Maximum Landing Weight
is the maximum weight approved for the landing touch down
Tare
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