MolaKule
Staff member
Aircraft are equipped with TCAS (Traffic Collision Avoidance System), which is supposed to help pilots avoid midair collisions. These alerts come in the form of either TAs (Traffic Advisories), which alert pilots of other planes nearby, or RAs (Resolution Advisories), which give specific instructions about which action pilots should take.
https://www.icao.int/NACC/Documents/Meetings/2024/GTE24/GTE24-P03.pdf
What is interesting is this:
"The Federal Aviation Administration (FAA) domestically manages the 960-1164 MHz band. Ground-based and airborne systems that operate in this band control civilian and military aircraft in the National Air Space (NAS). The Distance Measuring Equipment (DME) system and its military version, the Tactical Air Navigation (TACAN) system operates throughout the band. The Air Traffic Control Radar Beacon System (ATCRBS) and the Mode Select (Mode S) system have a ground-based and airborne component and operate on the frequencies of 1030 MHz and 1090 MHz. Identification Friend or Foe (IFF) system is the primary positive means of aircraft identification in air defense operations. An IFF transponder receives interrogation pulses at one frequency (1030 MHz), and sends the reply pulses at a different frequency (1090 MHz). Proper use of IFF facilitates rapid engagement of enemy aircraft, conserves air defense assets, and reduces risk to friendly aircraft. The Traffic Alert and Collision Avoidance System (TCAS) operates at 1030 and 1090 MHz and is independent of any ground system..."
https://www.ntia.doc.gov/files/ntia/publications/compendium/0960.00-1164.00_01MAR14.pdf
Notice the underlined frequencies: Did the local ATCRBS system have an internal problem that set-off the TCAS in various aircraft?
See also: https://en.wikipedia.org/wiki/Air_traffic_control_radar_beacon_system
https://www.icao.int/NACC/Documents/Meetings/2024/GTE24/GTE24-P03.pdf
What is interesting is this:
"The Federal Aviation Administration (FAA) domestically manages the 960-1164 MHz band. Ground-based and airborne systems that operate in this band control civilian and military aircraft in the National Air Space (NAS). The Distance Measuring Equipment (DME) system and its military version, the Tactical Air Navigation (TACAN) system operates throughout the band. The Air Traffic Control Radar Beacon System (ATCRBS) and the Mode Select (Mode S) system have a ground-based and airborne component and operate on the frequencies of 1030 MHz and 1090 MHz. Identification Friend or Foe (IFF) system is the primary positive means of aircraft identification in air defense operations. An IFF transponder receives interrogation pulses at one frequency (1030 MHz), and sends the reply pulses at a different frequency (1090 MHz). Proper use of IFF facilitates rapid engagement of enemy aircraft, conserves air defense assets, and reduces risk to friendly aircraft. The Traffic Alert and Collision Avoidance System (TCAS) operates at 1030 and 1090 MHz and is independent of any ground system..."
https://www.ntia.doc.gov/files/ntia/publications/compendium/0960.00-1164.00_01MAR14.pdf
Notice the underlined frequencies: Did the local ATCRBS system have an internal problem that set-off the TCAS in various aircraft?
See also: https://en.wikipedia.org/wiki/Air_traffic_control_radar_beacon_system
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