Change 7.1 is a safety enhancement for TCAS II products that will soon be mandated by the European Aviation Safety Agency (EASA) and has strong support from the FAA.

ACSS has developed and certified Change 7.1 software for its line of TCAS II products.
To order Change 7.1 for your TCAS, click here.

The primary changes to the TCAS operation with Change 7.1 are:

• Reversal Logic Enhancements
• "Level Off" Aural Alert
• Change to Descend RA's at Low Altitude

Change 7.1 also addresses these performance issues identified with TCAS Change 7.0:

• SA01: Failure of TCAS to Reverse some RAs when a Reversal is Required to Resolve the Collision.
• SA-AVSA: Frequent Instances of Flight Crews' Unintentional Incorrect Maneuvers to "Adjust Vertical Speed" RAs.

European Aviation Safety Agency (EASA) Mandate Plan:

"EASA plans to mandate carriage of Version 7.1:
The results of the mentioned study indicate that implementation of TCAS II version 7.1 in the aircraft fleets is urgently required. Following this meeting EASA undertook to publish an action plan for the implementation of TCAS II version 7.1."

-EASA on EUROCONTROL Website

• EASA Technical Standard Order (TSO) was Published December 2009
• "Change 7.1" Planned IR (Implementing Rule) from EASA
• FwdFit 1Mar12 & RetFit 1Dec15. For all TCAS Change 7.0

 

FAA Strong Supporter:

• FAA Published the TCAS II version 7.1 Technical Standard Order (TSO)
• FAA AC 120-55C - Air Carrier Operational Approval and Use of TCAS II
• "The latest version of software for TCAS II is version 7.1. To ensure compatibility with international standards, the FAA encourages the installation of this software as soon as practical."