Airplane Manual FK 9 ELA
FK Lightplanes
Revision 6
General
page 1-4
b) Meteorological
ISA
International Standard Atmosphere: OAT in MSL 15°C; pressure in
MSL 1013,2hPa; air a perfect dry gas; temperature gradient of
0,65°C per 100m
MSL
Mean sea level
OAT
Outside air temperature
c) Weight and Balance
Reference
Datum
An imaginary vertical plane from which all horizontal
distances are measured for balance purposes
Arm
The horizontal distance from the reference datum to the
center of gravity of an item
Moment
The product of the weight of an item multiplied by its arm
Airplane center
of gravity (C.G.)
The point at which an airplane would balance if sus-
pended. 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
Empty weight
Weight of the airplane including unuseable fuel, full
operating fluids and full oil; equipment as indicated
d) Conversions
1 Liter (Ltr)
=
0,264 USG
1 USG
=
3,785 Ltr
1 m
=
3,28 ft
1 ft
=
0,3048 m
1 km/h
=
0,54 kt
1 kt
=
1,852 km/h
1 cm
=
0,394 inch
1 inch
=
2,54 cm
1 bar
=
14,5 psi
1 psi
=
0,069 bar
1 kg
=
2,2 lbs
1 lbs
=
0,45 kg
