Hi,
More a question than a comment; but it follows on the previous, slightly.
On the transponder box B757 & 737) there is a setting for TA & TA/RA. On the MAP range selector is a TFC selector. With the transponder in TA/RA, but the TFC selected OFF, i.e. TFC does not appear on the MAP, but rather 'TA only' what is the status of the TCAS?
In the QRH for N-1 situations, it states "Transponder TA only." It is assumed this refers to the selector on the transponder panel, but the question has been asked that if the TFC switch is selected OFF, and the MAP shows TA only, why is this not sufficient?
I hope there are some boffins out there who can give a 100% definitive answer, rather than 90% 'ers I think "............"
No offence to anyone, but I need a 100% true factual answer to pass on.