FAA Chart Users’ Guide - VFR Chart Symbology - Helicopter Charts 52 AIRSPACE INFORMATION (Continued) Special Airspace Areas (Continued) Flight Restricted Zone (FRZ) Relating to National  Security Air Defense Identification Zone (ADIZ)  Note: Delimiting line not  shown when it coincides  with International Boundary,  projection lines or other linear  features. Special Security Notice Permanent Continuous Flight Restriction Areas Mode C (FAR 91.215) Appropriate notes as required may be shown. Terminal Radar Service Area (TRSA) Appropriate notes as  required  may be shown. Example: Washington DC Special Air Traffic Rules / Airport Traffic Areas (FAR Part 93) Appropriate boxed notes as  required shown adjacent to  area. Inside the FAR Part 93  boundary area, the cross  hatching is at a 45 degree  angle. Sporting Event Termporary Flight Restriction (TFR)  Sites Miscellaneous Activity Areas Aerobatic Practice Area Glider Operations  Hang Glider Activity Ultralight Activity Unmanned Aircraft Activity Parachute Jumping Area with Frequency Space Launch Activity Area