Introduction to the National Airspace

Front

Above Ground Level (AGL)

Back

Refers to the actual physical distance between something and the ground.

Front

Alert Areas

Back

Areas where unusual aerial activity is taking place, such as dense flight training activities, parachute jumping, and glider towing. They are marked with 'A' followed by numbers, such as 'A-65'.

Front

Controlled Firing Areas (CFA)

Back

Areas that would normally pose a threat to aircraft entering the area during active operations.

Front

Mean Sea Level (MSL)

Back

Refers to the altitude above sea level.

Front

Prohibited Areas

Back

Areas where flying is not allowed, marked by a 'P' and number on sectional charts.

Front

Restricted Areas

Back

An area that is restricted from flying unless you have authorization from the FAA or the controlling agency.

Front

Special Use Airspace

Back

Airspace where certain activities must be contained and/or areas where flight is not allowed. It consists of prohibited areas, restricted areas, warning areas, military operation areas, alert areas, and controlled firing areas.

Front

Warning Areas

Back

Areas that alert pilots to potential flight hazards, depicted by a 'W' followed by numbers.