Definition
The minimum vertical buffer of 250 feet that the missed approach segment of an RNAV (GPS) approach is designed to provide above obstacles in the missed approach climb area, assuming the pilot begins the missed approach at the published missed approach point and climbs at the standard climb gradient.
Plain English
When you fly the missed approach exactly as published, the procedure is built so you will pass at least 250 feet above any obstacle in the climb-out area.
Context Anchor
Seen in FAA discussions of RNAV (GPS) approach design, especially how final approach altitudes and minimums are set.
Derivation
Clearance comes from clear, meaning free from obstruction. In this phrase, it means physical space between the aircraft’s protected path and obstacles, not permission from air traffic control.
Why Pilots Care
Provides the required safety margin so the aircraft can safely descend toward the runway or missed approach point without striking obstacles.
Grounding Statement
Picture the published approach path as being drawn with a 250-foot vertical cushion above the highest relevant obstacle in that protected area.
Intuition Check
Do not read clearance here as an ATC authorization. It means a measured vertical buffer above obstacles, and it applies only when the procedure is flown as published.
Example Sentence 1
The procedure designers built the missed approach with a 250 feet obstacle clearance, so initiating the climb early or late changes the protection you actually have.
Example Sentence 2
If the aircraft descends below the published altitude, it may lose the required 250 feet obstacle clearance.