What is mode 3 in aviation?
What is mode 3 in aviation? Mode 3/A is designated as the common military/civil mode for air traffic control use. Make beacon code assignments to only ADS-B and/or transponder-equipped aircraft.
What is mode A and C?
Mode A, C, S and Ident Mode A equipment transmits an identifying code only. Mode C equipment enables the ATCO to see the aircraft altitude or flight level automatically. Mode S equipment has altitude capability and also permits data exchange.
Can an aircraft fly without a transponder?
When Must an Aircraft Have a Transponder? 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).