Definition
The point of interaction between a person and a machine, including the displays, controls, and feedback systems through which the operator monitors and directs the machine's behavior. In aviation, this refers to how pilots perceive information from aircraft systems and how they input commands to those systems.
Plain English
The way a person and a machine talk to each other — what the machine shows you, and how you tell it what to do.
Context Anchor
Seen in discussions of cockpit design, aircraft automation, flight displays, warning systems, and how pilots manage equipment during flight.
Derivation
Interface comes from the Latin inter (between) and facies (face or surface). It literally means the surface or boundary where two things meet. So a human/machine interface is simply the meeting point between a person and a machine.
Why Pilots Care
A clear interface reduces errors and workload; a confusing one increases risk during critical phases of flight.
Analogy
A car’s steering wheel, dashboard, pedals, and warning lights are part of its human-machine interface. They are how the driver tells the car what to do and how the car tells the driver what is happening.
Intuition Check
Do not think of human/ machine interface as only a computer screen. It includes every control, display, alert, and procedure that connects the pilot with the aircraft system.
Example Sentence 1
The instructor explained that the glass cockpit changed the human/machine interface, replacing round dials with integrated digital displays.
Example Sentence 2
Training emphasizes recognizing when the human/machine interface is adding to workload rather than reducing it.