@STA. 83.2.” Go left and read the pilot/passenger moment (28.3 thousand lb.-inches).  The loading chart used in the sample problems 1 and 2 is designed to graphically calculate the loaded center of gravity and show whether it is within limits, all on a single chart. Another type of loading chart calculates moments for each station. You must then add up these moments and consult another graph to determine whether the total is within limits. Although this method has more steps, the charts are sometimes easier to use. Reduction factors are often used to reduce the size of large numbers to manageable levels. In figure 7-7, the scale on the loading graph gives you moments in thou- sands of pound-inches. In most cases, when using this type of chart, you need not be concerned with reduc- tion factors because the CG/moment envelope chart normally uses the same reduction factor. [Figure 7-8] T begin, record the basic empty weight of the helicop- ter along with its total moment. Remember to use the actual weight and moment of the helicopter you are fly- ing. Next, record the weights of the pilot, passengers, fuel, and baggage on a weight and balance worksheet. Then, determine the total weight of the helicopter. Once you have determined the weight to be within pre- scribed limits, compute the moment for each weight and for the loaded helicopter Do this with a loading graph provided by the manufacturer Use figure 7-7 to determine the moments for a pilot and passenger weighing 340 pounds and for 211 pounds of fuel. After recording the basic empty weight and moment of the helicopter, and the weight and moment for each item, total and record all weights and moments. Next, plot the calculated takeoff weight and moment on the sample moment envelope graph. Based on a weight of 1,653 pounds and a moment/1,000 of 162 pound-inches, the helicopter is within the prescribed CG limits. Start at the bottom scale labeled LOAD WEIGHT. Draw a line from 211 pounds up to the line labeled “FUEL @ STA108.5.” Draw intersect the MOMENT scale and read the fuel moment (22.9 thousand lb.-inches). Do the same for the pilot/pas- senger moment. Draw a line from a weight of 340 pounds up to the line labeled “PILOT & PASSENGER The combination method usually uses the computa- tion method to determine the moments and center of gravity. Then, these figures are plotted on a graph to determine if they intersect within the acceptable enve- lope. Figure 7-9 illustrates that with a total weight of 2,399 pounds and a total moment of 225,022 pound- 7-6 COMBINATION METHOD SAMPLE PROBLEM 3 Figure 7-8. CG/Moment Chart. Figure 7-7. Moments for fuel, pilot, and passenger. 190 180 170 160 150 140 130 120 110 100 1,100 1,200 1,300 1,400 1,500GLYPH<.notdef> GLYPH<.notdef> 1,600 1,700 LOADED WEIGHT (POUND) LOAD MOMENT/1000 (POUNDS - INCHES) 1. Basic Empty Weight..................GLYPH<.notdef> GLYPH<.notdef> 2. Pilot and Front Passenger........ 3. Fuel........................................... 5. Baggage................................... TOTALS GLYPH<.notdef> WeightGLYPH<.notdef> (lbs.) MomentGLYPH<.notdef> (lb.-ins.GLYPH<.notdef> /1,000) 1,102 110.8 28.3 340 22.9 211 162.0 1,653 Aft CG LimitGLYPH<.notdef> Station 101.0 Forward CG LimitGLYPH<.notdef> Station 95.0 F U E L @ S T A . 1 0 8 . 5 P I L O T & P A S E N G E $_{R}$@ S T A . 8 3 . 2 0 100 200 300 400 500 4 8 12 16 20 24 28 32 36 MOMENT (THOUSANDS OF LBS.-IN.) LOAD WEIGHT (LBS)