Eurocopter AS 350 83 Flight Manual page 223

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COMPLEMENTARY FLIGHT MANUAL
2 CENTRE-OF-GRAVITY -CONVENTIONAL TERMS
.
2.1 Definition of the datum trihedral
The centre-of-gravity figures are dimensions measured perpendicularly to
the faces of the datum trihedral.
The trihedral is fonmed by the following planes:
a) A horizontal plane parallel to the cabin floor datum, the Z datum
plane and situated 2.60 m (102.3 in.) above this datum.
b) A vertical plane perpendicular to the cabin floor datum. This Y
datum plane is the aircraft plane of symmetry. Dimensions to the
left (port) are negative, dimensions to the right (starboard)
are positive.
c) A vertical plane perpendicular to the two mentioned above, situated
3.40 m (133.8 in.) forward of the centre of the main rotor. This is
the X datum plane, from which the longitudinal reference stations
.
and CG positions are measured.
The cabin floor datum is materialized by the surface of the cabin floor.
0
0
...
g
~ .
2.2 CG location limits
CG location limits are never to be exceeded (Refer to SECTION 2 and
the "LIMITATIONS" paragraph of some SUPPLEMENTS)
CAUTION: A CG LOCATION WHICH IS CORRECT ON TAKEOFF MAY CHANGE IN
THE COURSE OF THE MISSION, DUE TO FUEL WEIGHT REDUCTION OR
LOADING VARIATION AND SO EXCEED ACCEPTABLE LIMITS.
Longitudinal CG must be the more closely watched.
. Lateral CG need be considered only in very dissymetric loading
configurations.
R
350 B3 6. 1
00-23 Page 2
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