Definition
A fueling nozzle that locks into a matching receptacle on the aircraft using a push-and-twist motion, forming a sealed, pressurized connection for single-point refueling. The nozzle engages locking lugs in the receptacle so it cannot pull free while fuel is flowing under pressure.
Plain English
A fuel hose fitting that pushes into a port on the aircraft and twists to lock in place, so it stays sealed while fuel is pumped in under pressure.
Context Anchor
Seen during aircraft fueling, especially on aircraft that use pressure fueling instead of simple over-wing fueling through an open cap.
Derivation
Named after the bayonet — a blade attached to a rifle by pushing it on and giving it a quarter-turn to lock. The fueling nozzle uses the same push-and-twist locking action, which is why it shares the name.
Why Pilots Care
A secure connection prevents fuel spills that create fire hazards and environmental contamination during every refuel.
Analogy
It works like a twist-lock camera lens or a push-and-turn light bulb: line it up, push it in, and turn it until it locks.
Intuition Check
Do not picture a weapon attached to the fuel hose. Here, bayonet means a push-and-turn locking style of connection.
Example Sentence 1
The line crew connected the bayonet fueling nozzle to the single-point receptacle under the wing before starting the pump.
Example Sentence 2
After refueling, the pilot verified the bayonet fueling nozzle was fully disengaged before closing the fuel cap.