Contiguous U.S. ADIZ (Air Defense Identification Zone) Description: - Surrounds the nation's eastern, southern, and western borders Requirements/Limitations: - IFR or DVFR (Defense VFR) flight plan - Discrete transponder code (Mode C) - DVFR aircraft must make position reports prior to entering - Two-way radio communication - 12 " N-numbers Question: What is a DVFR flight plan, and why is one required for VFR aircraft that enter the contiguous U.S. ADIZ? Answer: A normal VFR flight plan is not transmitted to ATC: It exists for search-and-rescue purposes only. A DVFR (Defense VFR) flight plan is transmitted to ATC, letting controllers know that the aircraft will be approaching an ADIZ under VFR. Ref. AIM 5-6-1 © Air Safety Institute airsafetyinstitute.orghttp://www.airsafetyinstitute.org http://www.airsafetyinstitute.org