Definition
The named portions that make up a published instrument approach procedure. An instrument approach is divided into four standard segments: the initial approach segment, the intermediate approach segment, the final approach segment, and the missed approach segment. Each segment begins and ends at a designated fix or point and has its own purpose, course guidance, altitude requirements, and obstacle clearance criteria.
Plain English
An instrument approach is broken into four named parts. Each part starts at a specific point, takes the aircraft a step closer to the runway (or back into safe airspace if the landing is abandoned), and has its own rules for heading, altitude, and clearance from obstacles.
Context Anchor
Seen on instrument approach charts and in instrument training when a pilot is briefing how the approach is built from start to finish.
Derivation
Segment comes from a Latin word meaning “a piece cut off.” That fits the aviation use: the full approach is divided into separate pieces so the pilot can understand and fly it one part at a time.
Why Pilots Care
Knowing the segments lets a pilot maintain the correct altitude and course through each stage, preventing controlled flight into terrain and enabling a safe transition to landing or a missed approach.
Grounding Statement
Think of the approach as a planned path with named parts: getting established, getting lined up, descending toward the runway, and then either landing or following the missed approach instructions.
Intuition Check
Do not think of “segments” as informal chunks of the approach. In this context, they are published parts of the procedure with specific purposes and boundaries.
Example Sentence 1
After crossing the initial approach fix, we transitioned from the initial segment into the intermediate segment and slowed to final approach speed.
Example Sentence 2
Crossing the final approach fix marked the start of the final approach segment of the instrument approach procedure.