What is the Mode C veil and where is it typically applied?

What is the Mode C veil and where is it typically applied?

• A. A radius around certain Class B airports within which altitude reporting is required.
• B. A zone around Class C airports where only IFR flights allowed.
• C. A corridor for VFR only.
• D. A path connecting satellites; No.

Answer: (A)

Mode C veil is a surveillance boundary around select Class B airports. Within that roughly 30 nautical mile radius, aircraft must have an altitude-reporting transponder (Mode C) so ATC can automatically receive and use altitude information. This improves radar accuracy and vertical separation in busy airspace. It’s not a special IFR/VFR corridor, nor a satellite path—it's a defined ring around certain Class B airports where altitude data is required.

Mode C veil is a surveillance boundary around select Class B airports. Within that roughly 30 nautical mile radius, aircraft must have an altitude-reporting transponder (Mode C) so ATC can automatically receive and use altitude information. This improves radar accuracy and vertical separation in busy airspace. It’s not a special IFR/VFR corridor, nor a satellite path—it's a defined ring around certain Class B airports where altitude data is required.