A&P Weight and Balance Principles Questions and Answers

Question 1

An aircraft is loaded such that its center of gravity (CG) is located at the most forward limit. Which of the following performance characteristics is to be expected?

Accepted Answer

A lower cruising speed and a higher stalling speed.

Answer

A forward CG requires greater back pressure on the elevator controls to maintain level flight. This results in flying with a higher angle of attack, which increases induced drag. The increased drag leads to a lower cruising speed, and the higher angle of attack means the aircraft is closer to its critical angle of attack, resulting in a higher stalling speed.

Question 2

A technician needs to calculate the center of gravity (CG) of an aircraft. The total weight is 3,500 lbs and the total moment is 297,500 in-lbs. What is the correct formula and resulting CG location?

Accepted Answer

CG = Total Moment / Total Weight; 85 inches

Answer

The correct formula to find the Center of Gravity (CG) is to divide the total moment by the total weight. In this scenario: CG = 297,500 in-lbs / 3,500 lbs = 85 inches. The CG is located 85 inches from the datum.

Question 3

Which term is defined as the empty weight of the aircraft plus the weight of optional and special equipment that has been installed?

Accepted Answer

Basic Empty Weight

Answer

Basic Empty Weight includes the standard empty weight (airframe, engines, permanently installed equipment, unusable fuel, and full operating fluids) plus the weight of any installed optional or special equipment.

Question 4

During a weight and balance procedure, a technician calculates that a 50 lb piece of equipment needs to be moved to shift the aircraft's CG forward by 2 inches. If the total aircraft weight is 4,000 lbs, how far must the equipment be moved?

Accepted Answer

Forward by 160 inches

Answer

The formula for weight shifting is: Distance to Move = (Total Weight x CG Change) / Weight Shifted. Plugging in the values: Distance = (4,000 lbs x 2 inches) / 50 lbs = 160 inches. To move the CG forward, the equipment must also be moved forward.

Question 5

Which of the following defines the imaginary vertical plane from which all horizontal measurements of arm are taken for weight and balance purposes?

Accepted Answer

Datum

Answer

The Datum is an imaginary vertical plane or line established by the manufacturer from which all horizontal distances (arms) are measured for weight and balance calculations. Its location is specified in the aircraft's Type Certificate Data Sheet (TCDS) or flight manual.

A&P - Aircraft and Powerplant Certification Practice Test

A&P - Aircraft and Powerplant Certification Practice Test

A&P Weight and Balance Principles Questions and Answers