Definition
The act of removing weight from an aircraft — typically fuel, baggage, cargo, or passengers — to bring the aircraft within its allowable weight or center of gravity limits before flight.
Plain English
Taking things off the airplane to make it lighter, or to shift where the weight sits, so the aircraft is safe and legal to fly.
Context Anchor
Seen during preflight weight-and-balance calculations, especially when the aircraft is too heavy or the load is not balanced within limits.
Derivation
Simply 'off' (away from) plus 'loading' (placing weight onto something). The opposite of loading. In aviation it almost always refers to removing weight to fix a weight or balance problem.
Why Pilots Care
Ensures the aircraft stays within approved center-of-gravity limits for safe, stable flight.
Intuition Check
Off-loading does not mean moving weight to another place inside the aircraft. It means removing weight from the aircraft entirely.
Example Sentence 1
The pilot calculated the aircraft was 40 pounds over gross weight, so he began off-loading baggage until the numbers were within limits.
Example Sentence 2
Off-loading twenty gallons of fuel brought the airplane under maximum takeoff weight before departure.