My understanding of ROC and ROD in TCAS mandatory airspace is that aircraft are to reduce their rates to 1000fpm or less as they approach 1000ft of their assigned level. I have no document to support that but have a hazy memory of a pilot in a large company telling me that that is so. Such a rate of climb or descent should prevent any kind of RA but may still result in TA being given by the onboard equipment. Can anyone confirm that?
In any case, I still always give traffic information to closing traffic when one or both aircraft are climbing/descending, letting them know that they'll be stopping 1000ft above/below the other. Works a treat and everyone seems happier
