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FAA Private Pilot Test Prep

Category - FAA Private Pilot

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Refer to Figure 44 on page 46.
Determine if the helicopter weight and balance are within limits. WEIGHT ARM MOMENT (LB) (IN) (100) Empty weight 1,495.0 101.4 1,515.93 Oil, 8 qt --- 100.5 --- Fuel, 40 gal --- 96.0 --- Pilot and copilot 300.0 64.0
  1. 95.2 inches with the CG out of the envelope
  2. 95.5 inches with the CG in the envelope
  3. 95.2 inches with the CG in the envelope
  4. 95.5 inches with the CG out of the envelope
Explanation
Correct answer: A. 95.2 inches with the CG out of the envelope. First calculate all the weight on the helicopter - 1495 pounds empty weight + 300 pounds pilot and passenger + 240 pounds for the fuel + 15 pounds for the oil equals 2050 pounds. Now determine the total moment use the 1515193 + 1507 (the moment for the oil 15 lbs times 100.5) + 23040 (the moment for the fuel 240 X 96) + 19200 (the moment for the pilot and passenger 300 X 64) the total of all of these is 195340. Now find the CG moment which is the total moment divided by total weight or 195273/ 2050 pounds = 92.28 inches. Now use the top graph in the figure and see where the two points meet. It is aft of the dashed line where it decreases from 2200 pounds to 2000 pounds.
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