Definition
A diagram or list that identifies each electrical pin on a connector, showing which wire or signal is assigned to which pin position. Pinouts are used to verify correct wiring, troubleshoot faults, and ensure connectors mate properly during installation or repair of aircraft electrical and avionics components.
Plain English
A map showing what each pin in an electrical plug or socket is for, so a technician knows which wire goes where.
Context Anchor
Seen in aircraft wiring diagrams, avionics installation manuals, and troubleshooting instructions for electrical equipment.
Derivation
From 'pin' (the small metal contact in a connector) and 'out' (as in laying it out or mapping it out). A pinout literally lays out what each pin does.
Why Pilots Care
Pilots rarely work with pinouts directly, but understanding the term helps when discussing avionics installations, squawks, or repairs with maintenance personnel. A wrong pin connection can disable an instrument or cause misleading indications.
Analogy
A pinout is like a seating chart for a connector. The chart tells you exactly which seat each wire belongs in.
Intuition Check
Do not think of pinouts as loose pins or pins that have come out. Pinouts are the planned assignment of each connector pin.
Example Sentence 1
The avionics technician checked the pinouts before connecting the new transponder to make sure each wire matched the correct pin.
Example Sentence 2
Incorrect pinouts on the new transponder plug caused the installation to fail the ground test.