Which description best defines the No Transgression Zone?

• A. Area between/close to simultaneous parallel approaches
• B. Area outside of any instrument approach procedures
• C. The boundary of class B airspace
• D. A restricted area near military operations

Answer: (B)

The No Transgression Zone is about where the protection and guidance of published instrument approach procedures end. It marks the area outside any instrument approach procedures, where there is no assured obstacle clearance or procedure protection in place. When you’re inside instrument approaches, you follow the published steps and rely on the protected airspace; outside those procedures, you’re beyond that protection. So the description that best fits is the area outside of any instrument approach procedures—that’s the region where you must not rely on approach guidance. The other options describe different airspace uses and boundaries (parallel approaches, Class B boundaries, or restricted areas) and aren’t about the protection zone for instrument approaches.