Definition
The lowest altitude, published on an instrument approach chart, at which an aircraft is permitted to cross the Final Approach Fix (FAF) when beginning the final segment of the approach.
Plain English
The lowest height you are allowed to be at when you cross the point where the final part of the approach begins.
Context Anchor
Seen on instrument approach procedures and in cold-temperature correction tables when checking the altitude required at the final approach fix.
Derivation
FAF stands for Final Approach Fix — the published point where the final descent toward the runway begins. 'Crossing altitude' simply means the altitude you must be at as you pass over that point.
Why Pilots Care
Ensures obstacle clearance and a stable descent path; flying below it risks terrain conflict or unstable approach.
Grounding Statement
Picture arriving at the final approach fix in freezing weather: even if the altimeter shows the published altitude, the airplane may actually be lower, so the required crossing altitude may need to be corrected upward.
Intuition Check
Minimum does not mean “aim for this exact altitude.” It means “do not be below this altitude” when crossing the final approach fix.
Example Sentence 1
With the outside air temperature well below freezing, the pilot added a cold temperature correction to the minimum FAF crossing altitude before beginning the descent.
Example Sentence 2
After applying the cold temperature correction, the crew flew the approach at the adjusted Minimum FAF Crossing Altitude.