How does TCAS II work?
TCAS II systems coordinate their resolution advisories before issuing commands to the pilots, so that if one aircraft is instructed to descend, the other will typically be told to climb — maximising the separation between the two aircraft.
What is ACAS II?
The Airborne Collision Avoidance System II (ACAS II) was introduced in order to reduce the risk of mid-air collisions or near mid-air collisions between aircraft. ACAS II is an aircraft system based on Secondary Surveillance Radar (SSR) transponder signals.
What are the different types of TCAS operation mode?
TCAS can be currently operated in the following modes:
- Standby: TCAS does not issue any interrogations and the transponder only replies to discrete interrogations.
- Transponder: the transponder replies to all appropriate ground and TCAS interrogations and TCAS remains in stand-by.
What is the latest version of TCAS?
version 7.1
“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.”
What’s the difference between TCAs 1 and 2?
All TCAS systems provide some degree of collision threat alerting, and a traffic display. TCAS I and II differ primarily by their alerting capability. TCAS I provides traffic advisories (TAs) to assist the pilot in the visual acquisition of intruder aircraft.
What can a TCAS I system do for You?
TCAS I systems are able to monitor the traffic situation around a plane (to a range of about 40 miles) and offer information on the approximate bearing and altitude of other aircraft. It can also generate collision warnings in the form of a “Traffic Advisory” (TA).
When was the FAA TCAs 2 manual published?
This booklet is an update of the TCAS II Version 7.0 manual published in 2000 by the Federal Aviation Administration (FAA). It describes changes to the CAS logic introduced by Version 7.1 and updates the information on requirements for use of TCAS II and operational experience.
What are the changes in TCAS version 7.1?
Version 7.1 logic changes will improve TCAS Resolution Advisory (RA) sense reversal logic in vertical chase situations. In addition all “Adjust Vertical Speed, Adjust” RAs are converted to “Level-Off, Level-Off” RAs to make it more clear that a reduction in vertical rate is required.
