What type of transponder is required for airplane operations in Class B airspace?

For airplane operations in Class B airspace, a Mode S transponder or a 4096 code transponder is required. This requirement ensures effective communication and tracking of aircraft within busy airspace, as Class B airspace is typically located around the busiest airports where high levels of air traffic occur.

A Mode S transponder is particularly important because it allows for data-link capabilities and selective transponder addressing, which enhances traffic awareness and safety. The 4096 code feature is part of the transponder's ability to provide a unique identification for each aircraft, facilitating its tracking on radar screens.

In contrast, a Mode C transponder only provides altitude reporting without the additional features of Mode S, thus not meeting the heightened surveillance and communication needs of Class B airspace. Basic transponders without altitude reporting do not provide adequate data for the necessary separation and awareness in such densely trafficked areas. Lastly, while Secondary Surveillance Radar (SSR) transponders are involved in the operation of radar systems, the terminology doesn't match the specific requirements for flying in Class B airspace.

Therefore, the choice of a Mode S transponder or a 4096 code transponder aligns with the regulations and safety standards set for operations within Class B airspace, supporting the