Certified Flight Instructor - Flight Instructor Airplane Practice Exam

How far aft of the datum would the CG be located based on the given weights?

1. 100.8 inches

2. 109.0 inches

3. 121.7 inches

4. 115.5 inches

The correct answer is: 100.8 inches

To determine how far aft of the datum the center of gravity (CG) is located based on the weights provided, you would typically use the formula that calculates the CG position. This is done by taking the moments of each weight about the datum, summing those moments, and then dividing by the total weight of the aircraft. If the correct answer indicates that the CG is located 100.8 inches aft of the datum, it suggests that the specific calculations involving the weights and their respective arm lengths with respect to the datum point yielded this precise measurement. This position can indicate that the distribution of weight is balanced correctly, assuring that the CG remains within the acceptable limits for safe flight. In the context of airplane performance and safety, having the CG at the correct position is crucial as it affects the aircraft's stability and maneuverability. If the calculated CG is indeed at 100.8 inches, this aligns with the necessary parameters to ensure optimal aircraft handling and performance. Understanding how to calculate CG accurately is essential for flight instructors and pilots, as improper CG can lead to adverse flight characteristics, including difficulty in controlling the aircraft and increased stall risks.