How is a weight and balance calculation performed?

Prepare for the Aircraft Maintenance Technician 40 OandP Exam. Practice with flashcards and multiple choice questions. Each question is accompanied by hints and explanations to support your learning. Ace your exam with confidence!

Weight and balance calculations determine where the aircraft’s center of gravity lies by accounting for every item on board and its location from a reference point. You take each item’s weight and its arm (distance from the datum), multiply to get the moment, and then sum all the weights and all the moments. The center of gravity is found by dividing the total moment by the total weight. This CG figure is then checked against the aircraft’s published forward and aft limits to ensure the airplane remains within the allowable envelope for stability and controllability. If the CG is outside limits, loading is adjusted by redistributing baggage, passengers, or fuel to bring it back inside the limits. Simply counting passengers omits baggage, fuel, and other items; measuring fuel or airspeed and altitude does not reveal weight distribution or CG.