Definition
A set of weight and balance calculations used to determine how the center of gravity (CG) of an aircraft changes when cargo, fuel, or passengers are moved from one location to another, added to the aircraft, or removed from it. Each action changes either the total weight, the total moment, or both, and the new CG is found by dividing the new total moment by the new total weight.
Plain English
These are the math steps a pilot uses to figure out how the aircraft's balance point moves when something heavy is shifted to a new spot, loaded on, or taken off. Moving weight changes where the balance point sits; adding or removing weight changes both how heavy the aircraft is and where it balances.
Context Anchor
Seen during preflight planning, loading baggage or passengers, changing equipment, or checking whether the aircraft remains within its weight-and-balance limits.
Why Pilots Care
These adjustments are required to keep the center of gravity inside certified limits; failure to do so can make the aircraft uncontrollable.
Analogy
It is like carrying a heavy box: the box may weigh the same, but it feels very different if you hold it close to your body instead of at arm’s length. In an aircraft, where the weight sits matters as much as how much weight there is.
Grounding Statement
A small item moved far from the aircraft’s balance point can matter more than the same item placed close to it.
Intuition Check
Do not assume this is only about making the airplane heavier or lighter. In this context, moving the same weight to a different location can change the aircraft’s balance even when the total weight does not change.
Example Sentence 1
After loading the baggage compartment, the CG was just behind the aft limit, so the pilot worked through a shifting weight calculation to see how far forward two suitcases needed to move.
Example Sentence 2
After adding passengers and fuel, the crew removed unnecessary equipment to reduce total weight before departure.