> RADAR wasn't necessary -- TCAS works fine as long as everyone has a > transponder (which they have to in the flight levels). Initially, TCAS was > optional, then it became required for passenger planes, and in the U.S., at > least, it is now required for cargo planes because of an incident in the > late 1990s. In the case of the accident you mention, I'm pretty sure that > one of the airliners did get a TCAS alert but responded incorrectly; in that > case, it's hard to assume that they would have done any better with primary > radar (which is much harder to interpret, even for ATC).
The accident occurred over Switzerland. Both Airliners get the TCAS alerts (Traffic Advisory and Resolution Advisory) and initiated the correct maneuver. Unfortunately the controller (who is not aware of the on board TCAS Resolution Advisory) gave a contradictory instruction to clear the conflict. He insisted so much that the pilot followed the controller instruction and ... There was a hole in the "Flight Legislation" regarding the use of the TCAS. What shall the pilot do when a TCAS R.A. contradicts a controller instruction to clear a conflict... Before this accident, the pilot behavior was depending on the training he received from his company (company procedure)... Now, everybody should follow the TCAS instructions... > All the best, > > > David > > _______________________________________________ > Flightgear-devel mailing list > [EMAIL PROTECTED] > http://mail.flightgear.org/mailman/listinfo/flightgear-devel > _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
