Falling value triggers alert

[Guest pscarratt]

Hi all,I'm trying to add the decision height callouts to my panel but I don't know how to trigger a one time only event.For example I want the event to be triggered when the radio altimeter reached the dh altitude but not to keep triggering if the plane stayed at that height.Any ideas?Thanks,

[phjvh 0]

Paul,Not tested, but you could try:(A:Radio Height,feet) (A: Decision Height,feet) - 20 < (A:Radio Height,feet) (A: Decision Height,feet) - -20 > (A:Flaps Handle index,enum) 5 > (G:Var1) 0 == && && && if{ 12345678 (K:ADF Complete Set) 1 (>G:Var1) } (A:Radio Height,feet) (A: Decision Height,feet) - -20 > (A:Radio Height,feet) (A: Decision Height,feet) - 20 < && if{ 0 (>G:Var1) }So this means the callout can be heard only once ( (G:Var1) 0 == )when difference between Dec. and Radio Height = 40 feetand in landing configuration (flaps handle index);The condition (G:Var1) 0 == becomes immediately (G:Var1) 1 ==so the sound cannot be triggered anymore.After that (G:Var1) becomes automatically 0 ==.Assuming not taking off with full flaps, you will not hear the sound.Btw. of course you have to use xml-sound.gau of D. Dawson to generate the sound.Hope it helps,Jan"Beatus Ille Procul Negoiis"

[Guest pscarratt]

Thanks Jan thats perfect!

[Guest Eugen]

Hi,Vertical speed = negative could maybee also be used as a condition for callouts, to avoid to trigger it when you climb if you have several landing confs for flaps which could be used for take off as well.BrgdsEugen