Definition
The published altitude at which an aircraft must cross the Final Approach Fix (FAF) when flying a non-precision instrument approach. It marks the start of the final descent toward the runway and is depicted on the approach chart at the FAF symbol.
Plain English
The exact altitude you must be at when you reach the point where the final straight-in part of the approach begins. From there, you start your final descent toward the runway.
Context Anchor
Seen on instrument approach charts, especially in the profile view where the approach path and crossing altitudes are shown.
Derivation
“Final” comes from a word meaning “end” or “last.” “Approach” means moving toward something, and in aviation it means the charted path toward landing. “Fix” in navigation means a known position, not a repair. Together, the term points to the altitude tied to the known position where the last part of the approach begins.
Why Pilots Care
Ensures obstacle clearance and positions the aircraft for a stabilized descent to the runway.
Intuition Check
“Fix” does not mean a repair here; it means a defined position on the approach. “Final Approach Fix Altitude” does not mean any altitude while lined up with the runway; it means the charted altitude tied to that specific point.
Example Sentence 1
Approaching the FAF, the pilot leveled off at the Final Approach Fix Altitude before beginning the final descent to the runway.
Example Sentence 2
Descending to the final approach fix altitude before the fix ensures compliance with the approach procedure.