May 2 Ground School - Weight and Balance

Weight and Balance Example:


front passenger (180 pounds) departs. A rear passenger (204 pounds) moves to the front passenger position. What effect does this have on the CG if the airplane weighed 2,690 pounds and the MOM/100 was 2,260 just prior to the passenger transfer?




solve for total w * arm = Moment
2690 * x = Moment 2260
2260/2690
x=84.1
look up pass ARMS in chart
180 lbs in front = 153
204 in rear = 172
204 now in front = 244
orig Moment 2260 - departing front pass 153 - in rear pass 244 + now in front 172 = 2036.4
weight 2690 - 180 less the departing pass1 now
so 2036/2510= 81.1
orig arm is 84
so since you count arm from rear to front
84 moves closer to 81 that is a 3 inch increase forward