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{{Infobox Safety Nets
|source            = EUROCONTROL
|source_image      = EUROCONTROL
|source_caption    = About EUROCONTROL
|control           = SKYbrary
|control_image     = SKYbrary
|control_caption   = About SKYbrary
}}

==Description==
For [[Airborne Collision Avoidance System (ACAS)|TCAS II systems]] to work as designed and to resolve a risk of mid-air collision, immediate and correct flight crew response to TCAS resolution advisories (RA) is essential.

TCAS has been deployed to act as a last resort safety net to mitigate the risk of midair collisions by providing flight crews with collision avoidance advice.  

==IATA/EUROCONTROL Guidance Material==

[[File:Performance Assessment of Pilot compliance with TCAS.jpg|200px|link=https://www.skybrary.aero/bookshelf/books/4507.PDF]]

IATA and EUROCONTROL have jointly produced guidance on the assessment of pilot compliance to Traffic alert and Collision Avoidance System (TCAS) RAs using Flight Data Monitoring (FDM). This document highlights that the most important single factor affecting the performance of TCAS is the response of pilots to RAs. 

This guide, which is based on the ICAO provisions, recommends that operators establish procedures detailing how their flight crews should operate TCAS and respond to RAs.

The document provides general guidance on the assessment of pilot responses to TCAS RAs and contains a set of indicators and measurements to support such assessment.

'''''NB''''': A version of this publication, containing also [[TCAS RA High Vertical Rate (SKYclip)|the video clip on TCAS RA High Vertical Rate]], is available on the [https://www.iata.org/contentassets/582fbe33f31240938bcf9f33d4b3d0a1/iata_guidance_assessment_of_pilot_compliance_to_tcas.pdf IATA website].

==Related Articles==
*[[ACAS Training]]
*[[RTF Phraseology associated with TCAS RAs]]
*[[ATC Avoiding Instructions Opposite to TCAS RA]]

==SKYclip: "Always Follow the RA"==

<html><iframe src="https://player.vimeo.com/video/231510006" width="500" height="281" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe></html>

==Further Reading==
*[https://www.skybrary.aero/bookshelf/books/4507.PDF Guidance Material: Performance assessment of pilot compliance to Traffic Alert and Collision Avoidance System (TCAS) using Flight Data Monitoring (FDM)], IATA and EUROCONTROL, 2nd Edition, January 2019.
*[[ACAS Bulletin - EUROCONTROL| The full collection of EUROCONTROL ACAS Bulletins]]
[[Category:Safety Nets]]