Regulation & law · 20/11/1996Updated: 10/18/2026 · 1 min read

Airworthiness Directives; Allied Signal Commercial Avionics Systems CAS-81 Traffic Alert and Collision Avoidance Systems (TCAS) as Installed in, but not Limited to, Various Transport Category Airplanes

The Federal Aviation Administration (FAA) has issued an amendment to an existing airworthiness directive (AD) for transport category airplanes equipped with Allied Signal Commercial Avionics Systems CAS-81 TCAS, requiring a revision to the Airplane Flight Manual (AFM) to address a potential hazard associated with failure of the audio output of the CAS-81 TCAS, and providing an alternative method of compliance and a modification to the TCAS processor to terminate the requirements of the AD.