Definition
Defined sections of an instrument procedure stored in a navigation database, each representing a specific portion of the flight path such as the initial approach, intermediate, final approach, or missed approach segment. The database holds the path, course, altitude, and termination point for each segment so the avionics can sequence through them automatically.
Plain English
An instrument procedure is broken into pieces, and each piece is one segment. The navigation database stores each piece separately so the avionics can fly them one after another.
Context Anchor
Seen in discussions of airborne navigation databases, especially how cockpit systems store and display airspace information.
Derivation
Segment comes from a Latin word meaning “a piece cut off.” That fits the aviation use: a large airspace system is broken into smaller defined pieces that a database can store and the pilot can see on a display.
Why Pilots Care
Pilots rely on correctly segmented airspace data to ensure the aircraft follows the right altitudes, routes, and separation rules during IFR operations.
Grounding Statement
Picture the sky divided into mapped pieces, each with edges and height limits, so the aircraft's navigation system can show the right area at the right time.
Intuition Check
Do not read “segments” as casual or random chunks of sky. Here it means defined, database-coded pieces of airspace with specific boundaries and limits.
Example Sentence 1
The FMS automatically transitioned from the intermediate to the final approach segment as the aircraft crossed the final approach fix.
Example Sentence 2
Before departure the pilot verified that all airspace segments in the planned route were current in the database.