Originally Posted by Barronflyer
Can someone please advise the protocol to be followed if dispatching with TCAS RA U/S and subsequently receiving a TCAS TA.
Some TCAS units have the ability to have RA inop (RA flag on TCAS display) but still provide TA alerts. In this situation, our MEL directs us to operate the TCAS in TA Only mode, preventing any spurious RA warnings despite or because of the failure. RA inop is not necessarily related to mode C being inop.
Should the entire TCAS be inop, then the MEL directs us to disable the entire system for similar reasons.
The protocol to be followed following a TA is unchanged.