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Refer to figure.
A helicopter’s longitudinal Centre of Gravity (CG) position is + 95.15 in and lateral CG position is +2.04 in. With reference to the Single-Engine Piston Helicopter (SEPH), plot the CG position and select the correct position from the attached diagram.

Refer to figure.
All aircraft, both aeroplanes and helicopters have stipulated Centre of Gravity (CG) ranges. The ranges are the distance between forward and rearward as well as left and right allowable CG measured in inches/metres. The CG range is shown in the Helicopter Flight Manual (HFM) and type certification sheets in the form of a CG envelope.

Besides CG envelope, all aircrafts, both aeroplanes and helicopters have a maximum allowable gross mass known as All Up Weight (AUW).

Longitudinal CG can have both positive and negative values, if the position is in front of the datum line it will have a negative value and if the position is aft of the datum it will have a positive value.

Lateral CG can have both positive and negative values, if the position is to the left of the datum line it will have a negative value and if the position is to the right of the datum it will have a positive value.

For the longitudinal CG position draw a line from 95.15 in horizontally thereafter draw a line from the lateral CG arm of +2.04 in vertically until it crosses the longitudinal CG line and find the CG position on the figure.

The intersection of the lines shows that B is the correct position.

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