Definition
A small integrated circuit that performs the central processing functions of a computer, executing instructions, performing calculations, and controlling data flow between connected components. In aircraft systems, microprocessors are embedded in engine controls, avionics, and monitoring units to read sensor inputs, make logic decisions, and send commands to actuators or displays.
Plain English
The 'thinking chip' inside a computer or electronic control unit. It takes in information, follows a set of instructions, and decides what to do with it.
Context Anchor
Seen in discussions of electronic engine controls, aircraft instruments, and maintenance troubleshooting for systems that use computer-based control.
Derivation
From 'micro' (Greek mikros, small) and 'processor' (something that processes, or works through, information). The name reflects that an entire processing unit, which once filled a room, was shrunk onto a single small chip.
Why Pilots Care
Most modern engine and avionics functions depend on microprocessors. When a maintenance manual references a control unit, computer, or 'box' on the aircraft, a microprocessor is usually doing the actual work inside. Understanding this helps when troubleshooting electronic faults or reading system schematics.
Intuition Check
Do not think of a microprocessor as the whole computer or the whole aircraft system. It is the small instruction-following part inside a larger electronic system.
Example Sentence 1
The FADEC's microprocessor monitors engine sensor inputs and adjusts fuel flow many times per second.
Example Sentence 2
During maintenance, the technician verified that the microprocessor was receiving correct input signals.