Definition
An onboard computer system used in advanced aircraft that automates a wide range of flight tasks, including navigation, performance management, and route planning. The Flight Management Computer (FMC) accepts pilot inputs such as departure and destination airports, route waypoints, cruise altitude, and aircraft weight, then continuously calculates the most efficient flight profile and provides guidance to the autopilot, autothrottle, and cockpit displays.
Plain English
It is the aircraft's main flight-planning computer. The pilot tells it where the flight is going and how the aircraft is loaded, and it works out the route, speeds, and altitudes, then helps fly the airplane along that plan.
Context Anchor
Pilots encounter this term in aircraft with advanced navigation systems, especially turbine aircraft and transport airplanes, when entering a route, checking fuel predictions, or following computer-calculated guidance.
Derivation
The name describes its role: a computer that manages the flight. 'Manage' comes from the Italian maneggiare, meaning to handle or direct, and that is exactly what this computer does -- it directs the many tasks involved in running a flight from start to finish.
Why Pilots Care
It reduces pilot workload, improves fuel efficiency, and maintains precise lateral and vertical navigation throughout the flight.
Analogy
It is like a very specialized trip planner built into the airplane: it knows the planned route, uses aircraft data, and keeps updating the flight calculations as the trip progresses.
Intuition Check
Do not confuse the Flight Management Computer with the autopilot. The Flight Management Computer calculates and supplies guidance; the autopilot, if engaged, may use that guidance to move the airplane.
Example Sentence 1
Before pushback, the first officer entered the flight plan into the Flight Management Computer and cross-checked each waypoint against the paper release.
Example Sentence 2
When ATC issued a reroute, the crew quickly revised the flight plan in the Flight Management Computer and verified the new vertical profile.