Determining Loaded Weight and CG (Part One) Computational Method

The following is an example of the computational method involving the application of basic math functions.

Aircraft Allowances:

• Maximum gross weight…………………. 3,400 pounds
• CG range……………………………………… 78–86 inches

Given:

• Weight of front seat occupants…………. 340 pounds
• Weight of rear seat occupants………….. 350 pounds
• Fuel………………………………………………….. 75 gallons
• Weight of baggage in area 1………………..80 pounds

1. List the weight of the aircraft, occupants, fuel, and baggage. Remember that aviation gas (AVGAS) weighs 6 pounds per gallon and is used in this example.

2. Enter the moment for each item listed. Remember “weight x arm = moment.”

3. Find the total weight and total moment.

4. To determine the CG, divide the total moment by the total weight.

NOTE: The weight and balance records for a particular aircraft will provide the empty weight and moment, as well as the information on the arm distance. [Figure 9-5]

Figure 9-5. Example of weight and balance computations.

The total loaded weight of 3,320 pounds does not exceed the maximum gross weight of 3,400 pounds, and the CG of 84.8 is within the 78–86 inch range; therefore, the aircraft is loaded within limits.

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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