In article ,
"David Cartwright" wrote:

Al G wrote:
I thought in most of airlines' operation manual, a TCAS's manuever
instruction is a mendatory command that the crew must follow
immediately after its issurance.

This rings a bell with me too.

complying with a TCAS Resolution Advisory is indeed mandatory.

it may have come about as a result of a
collision between a Tu154 and a B757 over Germany a few years back.

Nope. This was the case from the beginning of TCAS II.

--
Bob Noel
Looking for a sig the
lawyers will hate