Wind effect on descent A320

[pineteam]

Just wanna share a tips a FO shared with me Yesterday using the ISIS. We all know the basic rules of altitude * 3 + (10 optional ) or track miles to go * 3 work very well. I have been using this for the last 10 years and it’s all you need really... If your mental maths s*ck or you are tired, what you can do is to look at your ISIS and check the altitude in Meters and take the first 2 digits and it will tell you how many track miles you need until landing. For example if you are at 22000 feet you need 22 * 3 = 66nm required or 22 *3+ 10 = 76 nm required. If you look at the altitude in Meters it will be roughly 6700 meters, you just look at the first 2 digits and voilą!—> 67 nm! If you want to be conservative or new on jet aircraft or super heavy and strong tail wind you can add +10= 77nm. And it works all the times since 1 meter = 3.28 feet. Which is close enough to the 1 to 3 rules. I personally do not add + 10 unless very strong tail wind as I rather be too high than too low to stay on idle all the way. I will add one nm per 10kt I need to decelerate to reach green dot. If you are too high you can always speed up (unless ATC restrictions) or use speed brakes at last resort which will give you an angle of descent much more than 3 degrees ( usually around 4/5 degrees) and therefore bring you back to your profile rapidly.