In which classes is a 4096 transponder with mode C mandatory?

A 4096 transponder with Mode C is mandatory in Class A, B, and C airspace. This requirement is due to the need for enhanced situational awareness and conflict resolution in busy airspace where both controlled and uncontrolled aircraft operate.

In Class A airspace, which extends from 18,000 feet up to and including flight level 600, all aircraft are required to be equipped with an operable transponder that can report altitude information, helping air traffic controllers manage traffic efficiently in a high-density environment.

In Class B airspace, which surrounds major airports, the communication and surveillance demands are significant due to the volume of air traffic. Hence, a Mode C transponder is necessary to allow for effective tracking of aircraft, ensuring that separation standards are adhered to.

Class C airspace also requires a 4096 transponder with Mode C to help integrate aircraft that may be entering the airspace from surrounding areas, providing monitors of altitude and ensuring that air traffic controllers can maintain safe separation between all aircraft operating within this region.

Other options are not correct because they either overlook one or more of these critical airspace classes or incorrectly associate Class D airspace with a requirement, where Mode C transponders are not mandatory unless otherwise specified by the