Definition
Additional obstacle clearance airspace built into a Minimum Turning Altitude (MTA) to account for the fact that an aircraft will overfly the fix before beginning its turn, rather than turning exactly at the fix. It ensures that obstacles in the area beyond the fix, in the direction of flight, remain safely below the aircraft during the turn.
Plain English
Aircraft don't turn on a dime. When you cross a fix and start a turn, you actually fly past the fix a bit before the airplane comes around. Flyover protection is the extra safety margin built into the published altitude so that obstacles in the area you overfly during that turn stay safely below you.
Context Anchor
Seen in instrument procedure design and minimum turning altitude discussions, especially where a turn begins after crossing a named point on the route.
Derivation
"Flyover" simply means flying over a point before turning, as opposed to turning before reaching it. The term names exactly what it protects against: the airspace you actually fly through after passing the fix.
Why Pilots Care
If the MTA is ignored or the turn is started late, the aircraft can drift into terrain or obstacles that the standard minimum enroute altitude (MEA) does not protect against. Climbing to the MTA before the turn keeps the flyover area safely clear.
Grounding Statement
Picture the aircraft crossing a required point, continuing slightly beyond it, and then rolling into the turn; flyover protection is the designed safety area for that actual path.
Intuition Check
Do not read “flyover protection” as general protection for flying over terrain. Here it means protection for a required over-the-point crossing before the turn begins.
Example Sentence 1
The chart showed an MTA at the fix because flyover protection was needed for rising terrain on the outside of the turn.
Example Sentence 2
Procedure designers add flyover protection whenever the turn begins only after the aircraft has passed directly overhead the fix.