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Determining Loaded Weight and CG (Part Two) Graph Method

in weight and balance

Another method for determining the loaded weight and CG is the use of graphs provided by the manufacturers. To simplify calculations, the moment may sometimes be divided by 100, 1,000, or 10,000. [Figures 9-6, 9-7, and 9-8]


  • Front seat occupants………………………………340 pounds
  • Rear seat occupants ………………………………..300 pounds
  • Fuel ………………………………………………………..40 gallons
  • Baggage area 1 ………………………………………..20 pounds

The same steps should be followed as in the computational method except the graphs provided will calculate the moments and allow the pilot to determine if the aircraft is loaded within limits. To determine the moment using the loading graph, find the weight and draw a line straight across until it intercepts the item for which the moment is to be calculated. Then draw a line straight down to determine the moment. (The red line on the loading graph represents the moment for the pilot and front passenger. All other moments were determined in the same way.) Once this has been done for each item, total the weight and moments and draw a line for both weight and moment on the CG envelope graph. If the lines intersect within the envelope, the aircraft is loaded within limits. In this sample loading problem, the aircraft is loaded within limits.

Figure 9-6. Weight and balance data.

Figure 9-6. Weight and balance data.

Figure 9-7. Loading graph.

Figure 9-7. Loading graph. -Click to Enlarge-

Figure 9-8. CG moment envelope.

Figure 9-8. CG moment envelope. -Click to Enlarge-

41K-VXcrOjL._SX381_BO1,204,203,200_Learn more about Aircraft Weight and Balance with the FAA Aircraft Weight and Balance Handbook. Weight and balance is one of the most important factors affecting safety of flight. An overweight aircraft, or one whose center of gravity is outside the allowable limits, is inefficient and dangerous to fly.

 

 

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