What does B mean in aviation?

Automatic Dependent Surveillance–Broadcast (ADS–B) is an advanced surveillance technology that combines an aircraft's positioning source, aircraft avionics, and a ground infrastructure to create an accurate surveillance interface between aircraft and ATC.



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ADS-B is required in Class A, B and C airspace within U.S. domestic airspace and all land mass regions of the U.S. as defined in 14 CFR 1.1 and it includes the states (contiguous and non-contiguous), U.S. possessions, or territories.

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Although the cost of installing equipment varies from aircraft to aircraft, the Civil Aviation Safety Authority (CASA) estimates the median price of installing a good quality certified ADS-B (out) unit at about $8,000, or $4,000 after the rebate.

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(In 1957, the English phonetic alphabet changed the R to Romeo, but by that time, Roger was deeply embedded in the minds of pilots.) So, in short, Roger means r which stands for received. The word Roger means nothing more.

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A transponder is not required unless an aircraft is operating: In Class A, Class B, or Class C airspace. Above 10,000 feet Mean Sea Level (MSL), excluding airspace below 2,500 feet Above Ground Level (AGL).

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However, if you wish to operate in class A, B, or C airspace, or at an altitude of over 10,000' MSL, or within a 30 nautical mile radius of the primary airport in class B airspace, you will need a transponder and altitude encoder (commonly referred to as mode C).

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VFR aircraft must obtain an ATC clearance to operate in Class B airspace.

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You must receive official clearance. Also, pilots must hold a minimum of a private pilot certification to enter Class B airspace.

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