Figure 7-9. Use the longitudinal CG envelope along with the computed CGs to determine if the helicopter is loaded properly. Figure 7-10. Computed Lateral CG. 7-7 Refer to figure 7-10. When computing moment for the pilot, 170 pounds is multiplied by the arm of 12.2 inches resulting in a moment of 2,074 pound-inches. As with any weight placed right of the aircraft centerline, the moment is expressed as a positive value. The forward passenger sits left of the aircraft centerline. To compute this moment, multiply 250 pounds by –10.4 inches. The result is in a moment of –2,600 pound-inches. Once the aircraft is completely loaded, the weights and moments are totaled and the CG is computed. Since more weight is located left of the aircraft centerline, the resulting total moment is –3,837 pound-inches. To calculate CG, divide –3,837 pound-inches by the total weight of 2,399 pounds. The result is –1.6 inches, or a CG that is 1.6 inches left of the aircraft centerline. Some helicopter manufacturers require that you also determine the lateral CG limits. These calculations are similar to longitudinal calculations. However, since the lateral CG datum line is almost always defined as the center of the helicopter, you are likely to encounter negative CGs and moments in your calculations. Negative values are located on the left side while posi- tive stations are located on the right. inches, the CG is 93.8. Plotting this CG against the weight indicates that the helicopter is loaded within the longitudinal limits (point A). CALCULATING LATERAL CG Weight Arm MomentGLYPH<.notdef> (pounds) (inches) (lb/inches) Basic Empty WeightGLYPH<.notdef> PilotGLYPH<.notdef> Fwd PassengerGLYPH<.notdef> Right Fwd BaggageGLYPH<.notdef> Left Fwd BaggageGLYPH<.notdef> Right Aft PassengerGLYPH<.notdef> Left Aft PassengerGLYPH<.notdef> Right Aft BaggageGLYPH<.notdef> Left Aft BaggageGLYPH<.notdef> GLYPH<.notdef> Totals with Zero Fuel GLYPH<.notdef> Main Fuel TankGLYPH<.notdef> Aux Fuel TankGLYPH<.notdef> GLYPH<.notdef> Totals with Fuel GLYPH<.notdef> CG 1,400GLYPH<.notdef> 170GLYPH<.notdef> 250GLYPH<.notdef> GLYPH<.notdef> 185GLYPH<.notdef> 50GLYPH<.notdef> 50GLYPH<.notdef> GLYPH<.notdef> 2,105 GLYPH<.notdef> 184GLYPH<.notdef> 110GLYPH<.notdef> GLYPH<.notdef> 2,399 107.75GLYPH<.notdef> 49.5GLYPH<.notdef> 49.5GLYPH<.notdef> 44GLYPH<.notdef> 44GLYPH<.notdef> 79.5GLYPH<.notdef> 79.5GLYPH<.notdef> 79.5GLYPH<.notdef> 79.5GLYPH<.notdef> GLYPH<.notdef> 106GLYPH<.notdef> 102GLYPH<.notdef> GLYPH<.notdef> 93.8 150,850GLYPH<.notdef> 8,415GLYPH<.notdef> 12,375GLYPH<.notdef> 0 0 0 14,708GLYPH<.notdef> 3,975GLYPH<.notdef> 3,975GLYPH<.notdef> GLYPH<.notdef> 194,298 GLYPH<.notdef> 19,504GLYPH<.notdef> 11,220GLYPH<.notdef> GLYPH<.notdef> 225,022 Longitudinal 2,500GLYPH<.notdef> 2,300GLYPH<.notdef> 2,100GLYPH<.notdef> 1,900GLYPH<.notdef> 1,700GLYPH<.notdef> 1,500 C L 91 93 95 97 99 101 103  260 256 252 248 244 240 236 232 1,100GLYPH<.notdef> 1,050GLYPH<.notdef> 1,000GLYPH<.notdef> 950GLYPH<.notdef> 900GLYPH<.notdef> 850GLYPH<.notdef> 800GLYPH<.notdef> 750GLYPH<.notdef> 700 Fuselage Station (CM from Datum) Gross Weight - lb. Gross Weight - KG Fuselage Station (in. from Datum) MainGLYPH<.notdef> Rotor Most FwdGLYPH<.notdef> CG withGLYPH<.notdef> Full Fuel Longitudinal (P oint A) Weight Arm MomentGLYPH<.notdef> (pounds) (inches) (lb/inches) Basic Empty WeightGLYPH<.notdef> PilotGLYPH<.notdef> Fwd PassengerGLYPH<.notdef> Right Fwd BaggageGLYPH<.notdef> Left Fwd BaggageGLYPH<.notdef> Right Aft PassengerGLYPH<.notdef> Left Aft PassengerGLYPH<.notdef> Right Aft BaggageGLYPH<.notdef> Left Aft BaggageGLYPH<.notdef> GLYPH<.notdef> Totals with Zero Fuel GLYPH<.notdef> Main Fuel TankGLYPH<.notdef> Aux Fuel TankGLYPH<.notdef> GLYPH<.notdef> Totals with Fuel GLYPH<.notdef> CG 1,400GLYPH<.notdef> 170GLYPH<.notdef> 250GLYPH<.notdef> GLYPH<.notdef> 185GLYPH<.notdef> 50GLYPH<.notdef> 50GLYPH<.notdef> GLYPH<.notdef> 2,105 GLYPH<.notdef> 184GLYPH<.notdef> 110GLYPH<.notdef> GLYPH<.notdef> 2,399 0 12.2GLYPH<.notdef> –10.4GLYPH<.notdef> 11.5GLYPH<.notdef> –11.5GLYPH<.notdef> 12.2GLYPH<.notdef> –12.2GLYPH<.notdef> 12.2GLYPH<.notdef> –12.2GLYPH<.notdef> GLYPH<.notdef> –13.5GLYPH<.notdef> 13GLYPH<.notdef> GLYPH<.notdef> –1.6 0 2,074GLYPH<.notdef> –2,600GLYPH<.notdef> 0 0 0 –2,257GLYPH<.notdef> 610GLYPH<.notdef> –610GLYPH<.notdef> GLYPH<.notdef> –2,783 GLYPH<.notdef> –2,484GLYPH<.notdef> 1,430GLYPH<.notdef> GLYPH<.notdef> –3,837 Lateral