they are two thousand eight hundred feet beneath us this airplane here uh passing underneath us that's uh probably that uh bw four seven three so they're two thousand nine hundred feet now they're NUMBER_TOKEN feet and they're descending because of this little down arrow if they had an up arrow they'd be climbing so that shows us where they are in relation to us if they're at plus a thousand they or plus NUMBER_TOKEN sorry it looks like plus NUMBER_TOKEN it means they're NUMBER_TOKEN feet above us if they're at three four it means they are three thousand four hundred thousand five hundred feet now beneath us and they are descending so that's a good way to gauge whether it's an issue or not um if we set it to ta only like this we'll still get to see that all but we get this warning ta only which means traffic advisory only or traffic alert only it means it's not going to actually give us that resolution advisory where it tells us what to do it's just going to shout traffic traffic at us but it won't actually do anything so we don't fly around in that mode unless there's a very specific emergency procedure that requires us to for example if the airplane loses an engine it may no longer be capable of flying a resolution advisory safely so you put it to alerts only so we'll leave it on tara now to show us let's look at this panel in a bit more detail so we've already said we need to set the right hand switch here on the tcas section to tara traffic advisory and resolution advisory and then the switch on the left shows what tells us what we're going to see on our displays so when it's set to the full left position which is threat it's not actually going to show us any traffic on our navigation display what it would do here is it will give us a picture of the traffic only if the traffic advisory or resolution advisory is present so it's basically hiding it they've also got to be within NUMBER_TOKEN NUMBER_TOKEN feet of where we are so we never really use that it's bit pointless it just hides all the data if we go to all we should see there we go we can now see some aircraft this is going to show us all traffic even without a traffic advisory or resolution advisory um as long as it's within two thousand seven hundred feet below or two thousand seven hundred feet above so um when it goes below two thousand seven hundred feet beneath us it will disappear off the screen and likewise if it goes above two seven thousand two thousand seven hundred feet above us so this is quite common to use because this will just give you a sensible idea of the traffic around you but we also have these two options above so above is going to show traffic way up above us up to NUMBER_TOKEN feet NUMBER_TOKEN feet above us so this is often used by pilots in the climb because it will give us a better idea better situational awareness of the traffic above us they go there they're descending beneath us now and then shortly they'll probably disappear off our screen as they go below NUMBER_TOKEN-NUMBER_TOKEN below us so when it's set to above the traffic that's more than NUMBER_TOKEN NUMBER_TOKEN feet beneath you will disappear off the screen but you'll see the traffic above you up to NUMBER_TOKEN feet above you so if you're climbing very quickly that is more useful it may give you a better idea of what's above you and where you're headed obviously uh
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