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Aircraft Certification Service (AIR)
Draft Technical Standard Orders (TSOs) Open for Comment

Document Title: AIRBORNE COLLISION AVOIDANCE SYSTEM (ACAS) Xa/Xo
Summary: This TSO provides minimum performance standards for Airborne Collision Avoidance Systems (ACAS) Xa/Xo. The ACAS Xa/Xo equipment provides a reliable airborne traffic alert and collision avoidance system (TCAS) function for transponder-equipped aircraft. It replaces TSO-C119e TCAS II systems. It uses the latest technology to increase safety margins, to allow use of other data sources (such as automatic dependent surveillance-broadcast [ADS-B] and ownship position), to better tune the surveillance logic and to optimize the collision avoidance logic. All these enhancements support NextGen operations.
Documents for Download: Draft Document
Draft Document Comment Grid
Reference: TSO-C219
Comments Due: December 16, 2019
How to Comment: Email comments to:
Sheila.mariano@faa.gov

Deliver comments by mail or hand to:
Federal Aviation Administration
Policy and Innovation Division, System and Equipment Standards Branch, AIR-6B0
950 L’Enfant Plaza SW, Suite 500
Washington, DC 20024

Fax comments to:
202-267-1813

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