Which data item is most critical to establish CG within limits before departure?

• A. Current weather.
• B. Published weight and balance data.
• C. Cabin crew schedule.
• D. Airport fuel price.

Answer: (B)

Knowing the aircraft’s weight distribution is the key to keeping the center of gravity within allowable limits. The center of gravity depends on the total weight and where that weight sits along the airplane’s longitudinal axis. To determine this accurately before departure you need the published weight and balance data, which includes the basic empty weight, moment arms (stations), and the certified CG envelope. With that information you can calculate the total moment for the planned loading and verify that the resulting CG lies between the forward and aft limits.

Current weather affects performance and fuel planning, but it doesn’t provide the data needed to determine CG. Cabin crew schedules and fuel price don’t establish the weight distribution or CG limits. Therefore, the published weight and balance data is the crucial item for confirming CG is within limits before takeoff.