The term FIRE TRUCK ACCESSORY is a job description for an item that is used on fire trucks. The crossword solution for this term is AXE, which is a three letter word. An AXE is a tool that is used to break down doors and other obstacles in order to gain access to a building or area during a fire. It is also used to cut through walls and ceilings in order to ventilate smoke and heat from a burning structure.