Definition
A shift in an aircraft's center of gravity so small that it does not meaningfully affect weight and balance, handling, or performance, and therefore does not require a new weight and balance computation after equipment changes or minor alterations.
Plain English
A change in where the airplane balances that is too small to matter. The airplane still flies and handles the same, so no new weight and balance paperwork is needed.
Context Anchor
Used in weight and balance planning when judging whether adding, removing, or using weight will noticeably move the aircraft’s balance point.
Derivation
Negligible comes from the Latin negligere, meaning to disregard or pay no attention to. CG is short for center of gravity — the point where the aircraft would balance if suspended from a single point. Together the phrase means a balance-point shift small enough to disregard.
Why Pilots Care
Permits simplified loading decisions without compromising safety margins or requiring repeated center-of-gravity recomputation.
Intuition Check
Do not read “negligible” as “zero.” Here it means “small enough that it has no practical effect in this weight-and-balance situation.”
Example Sentence 1
The mechanic noted that replacing the old transponder with a lighter model produced a negligible CG change, so no new weight and balance was required.
Example Sentence 2
The gradual fuel burn on the short cross-country flight produced only a negligible CG change, so no trim adjustment was required.