Definition
On an instrument approach chart profile view, the highest altitude at which an aircraft is authorized to fly on a given segment of the procedure. It is depicted with a line over the altitude value (for example, an altitude shown with a bar above it) and represents a regulatory ceiling that must not be exceeded while flying that segment.
Plain English
The top of the altitude window for that part of the approach. You may fly at this altitude or below it, but you may not go above it.
Context Anchor
Seen on the profile view of an instrument approach chart, especially near a named point or along a step in the descent path.
Derivation
Maximum comes from a Latin word meaning “greatest.” Altitude comes from a Latin word meaning “height.” Together, the words point to the greatest height allowed in that charted place.
Why Pilots Care
Ensures compliance with airspace restrictions and procedure requirements for safe separation and obstacle clearance.
Intuition Check
Do not read maximum altitude as the airplane’s highest possible altitude. Here, it means the highest altitude allowed by the chart at that point or segment.
Example Sentence 1
The profile view showed a maximum altitude of 3,000 feet on the intermediate segment, so the pilot leveled off and did not climb back up to 3,500.
Example Sentence 2
Pilots must not exceed the maximum altitude published for the holding pattern entry.