Within 30 miles of a Class B primary airport from the surface to 10,000 feet MSL, what transponder equipment is required?

Within 30 miles of a Class B primary airport from the surface to 10,000 feet MSL, what transponder equipment is required?

• A. An operable transponder having either Mode S or 4096 code capability with Mode C automatic altitude reporting capability
• B. A VOR receiver
• C. A GPS with WAAS
• D. An ELT

Answer: (A)

In this ring of airspace, ATC must be able to see your altitude, so a transponder that can report altitude is required. The way you meet this is with an operable transponder that provides automatic altitude reporting. That can be either a Mode S transponder (which includes altitude reporting) or a transponder capable of 4096 codes with Mode C altitude reporting. A VOR receiver, GPS with WAAS, or an ELT does not provide the required surveillance data to ATC, so they don’t satisfy this rule.

In this ring of airspace, ATC must be able to see your altitude, so a transponder that can report altitude is required. The way you meet this is with an operable transponder that provides automatic altitude reporting. That can be either a Mode S transponder (which includes altitude reporting) or a transponder capable of 4096 codes with Mode C altitude reporting.

A VOR receiver, GPS with WAAS, or an ELT does not provide the required surveillance data to ATC, so they don’t satisfy this rule.