Definition
The maximum permissible weight of a loaded aircraft (airframe, crew, passengers, cargo, and all other payload) excluding the weight of usable fuel. Any weight added beyond this limit must be in the form of usable fuel.
Plain English
The most an aircraft is allowed to weigh before any usable fuel is added. Once the aircraft is loaded with people and cargo up to this number, anything more must be fuel.
Context Anchor
Seen in weight-and-balance calculations, aircraft loading documents, and approved aircraft manuals.
Derivation
‘Zero fuel’ literally means ‘with no fuel on board.’ The term describes the weight of the aircraft when fuel quantity is treated as zero, regardless of how much fuel is actually loaded.
Why Pilots Care
It prevents structural overload once usable fuel is added and protects performance and center-of-gravity limits.
Intuition Check
Do not read “zero fuel” as “no fuel in the airplane.” Here it means the weight limit is checked without counting usable fuel.
Example Sentence 1
After loading passengers and baggage, the dispatcher confirmed the aircraft was 200 pounds under its maximum zero fuel weight before fueling began.
Example Sentence 2
Exceeding maximum zero fuel weight risks structural damage once the tanks are filled for departure.