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Traffic alert and collision avoidance system: Difference between revisions
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Traffic alert and collision avoidance system (view source)
Revision as of 12:10, 9 January 2011
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A '''traffic collision avoidance system''' or '''traffic alert and collision avoidance system''' (both abbreviated as TCAS) is an [http://en.wikipedia.org/wiki/Aircraft_collision_avoidance_systems aircraft collision avoidance system] designed to reduce the incidence of mid-air collisions between aircraft. | A '''traffic collision avoidance system''' or '''traffic alert and collision avoidance system''' (both abbreviated as TCAS) is an [http://en.wikipedia.org/wiki/Aircraft_collision_avoidance_systems aircraft collision avoidance system] designed to reduce the incidence of mid-air collisions between aircraft. | ||
FlightGear provides an instrument emulating the TCAS II Version 7 standard. | FlightGear provides an instrument emulating the [http://www.arinc.com/downloads/tcas/tcas.pdf TCAS II Version 7] standard. | ||
= Introduction = | = Introduction = | ||
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== ATC == | == ATC == | ||
Pilots should always follow a TCAS resolution advisory - even in case it contradicts an [[ATC]] instruction. | Pilots should '''always follow a TCAS resolution advisory''' - even in case it contradicts an [[ATC]] instruction (see [http://www.eurocontrol.int/msa/gallery/content/public/documents/ACAS_Bulletin%20_1_disclaimer.pdf ACAS II bulletin No 1]). | ||
However: | However: | ||
* Remember to immediately report any TCAS advisory to ATC. | * Remember to immediately report any TCAS advisory to ATC. | ||
"''<callsign> TCAS | **[[ATC phraseology | Phraseology]]: "'''<callsign> TCAS RA'''" (pronounced "TEE-CAS-AR-AY") | ||
* When an ATC instruction contradicts an active TCAS resolution advisory, keep following the TCAS advisory and report to ATC. | |||
" | **Phraseology: "'''<callsign> Unable, TCAS RA.'''" | ||
* When an ATC instruction contradicts an active TCAS resolution advisory, keep following the TCAS advisory and report to ATC. Phraseology: | * Pilots must report to ATC and return to their assigned altitude as soon as the conflict is cleared. | ||
"''<callsign> Unable | **Phraseology: "'''<callsign> Clear of conflict, returning to <assigned clearance>'''" | ||
A detailed description of TCAS-related ATC procedures is available in the | |||
[http://www.eurocontrol.int/msa/gallery/content/public/documents/ACAS_Bulletins_10_disclaimer.pdf ACAS II bulletin No 10: When ATC meets TCAS II] | |||
= Add to an airplane = | = Add to an airplane = | ||
In many countries the installation of a TCAS instrument is mandatory for | In many countries the installation of a TCAS instrument is mandatory for civil transport aircraft (Europe/EASA: mandatory for aircraft capable of carrying at least 19 passengers, USA/FAA: any aircraft capable of carrying at least 30 passengers). | ||
== TCAS instrument == | == TCAS instrument == | ||
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*[http://www.arinc.com/downloads/tcas/tcas.pdf FAA: Introduction to TCAS II Version 7] | *[http://www.arinc.com/downloads/tcas/tcas.pdf FAA: Introduction to TCAS II Version 7] | ||
*[http://www.eurocontrol.int/msa/public/standard_page/ACAS_Startpage.html EUROCONTROL ACAS Website] | *[http://www.eurocontrol.int/msa/public/standard_page/ACAS_Startpage.html EUROCONTROL ACAS Website] | ||
*[http://www.eurocontrol.int/msa/gallery/content/public/documents/ACAS_Bulletin%20_1_disclaimer.pdf ACAS II bulletin No 1: Follow the RA!] | |||
*[http://www.eurocontrol.int/msa/gallery/content/public/documents/ACAS_Bulletins_10_disclaimer.pdf ACAS II bulletin No 10: When ATC meets TCAS II] | |||