Roy Smith wrote:

Sam Spade wrote:

Gary Drescher wrote:


So seeing and avoiding during an instrument approach does not amount to some
sort of IFR-VFR hybrid. Rather, it is just IFR.

--Gary



Then, there is a TCAS RA during IMC. The IFR track, whether it be a
route or a terminal procedure, must be compromised to the extent
necessary to resolve the RA.


Yikes! I hope the TCAS processors are terrain aware.

Does TCAS give track instructions? I though all RA's were either
"climb now" or "descend now".

The TCAS processors certainly aren't terrain aware, but the TAWS is. On
an instrument approach or departure procedure, descent is not an option.
With an aircraft in approach or landing configuration the only option
might be to turn away from the conflict.

No doubt, it can get a bit ugly. Hopefully, if it's IMC the alert won't
occur during a departure or approach.