Definition
A designated geographic point on an instrument approach procedure, typically the outer fix or final approach fix, used by ATC as a reference for sequencing, clearance limits, and reporting position when proceeding inbound to the airport.
Plain English
A named point on the approach where the pilot is expected to report in or where ATC uses your position to line you up with other aircraft heading to the same runway.
Context Anchor
Seen in instrument approach procedures and air traffic control instructions when an aircraft is arriving at an airport with an operating control tower but no separate approach control service.
Derivation
Approach comes from an old French word meaning “to come nearer.” Fix comes from Latin meaning “to fasten” or “make firm.” In aviation, a fix is a firmly defined position, not a repair. Outer simply means farther out from the airport than the closer parts of the approach.
Why Pilots Care
It defines the exact point at which the pilot is expected to be established on the approach course and at the proper altitude before continuing inbound.
Analogy
Think of it like a marked meeting point before entering a planned route. Everyone knows that point, and it helps the pilot and controller coordinate the next move.
Intuition Check
Do not read “fix” as a repair, and do not read “approach” as just any movement toward the airport. Here, the term means a specific published position used as part of an instrument arrival and approach.
Example Sentence 1
Cleared for the ILS Runway 27 approach, report passing the approach/outer fix inbound.
Example Sentence 2
ATC cleared the flight direct to the approach/outer fix to join the localizer.