14th Jul 2012, 13:52
Good day all.
I came across a lot of different numbers and looking to see from the more experienced on average gates on approach.
I understand the alt to lose x 3 plus 10 and the headwind/tailwind concept, and surely it will get easier with experience.
Can anyone post some average gates on what alt to be by certain distance, What speed to be at, etc.
I'm sure it will be very helpful for now, for a newbie like myself.
Distance Height Speed Config
33 10000 280 max Clean
20 6000 250 Clean
12 3800 210 or Green Dot Flap 1
8 2500 180 or S speed Flap 1
4.5 1500 160 or F speed Flap 2 or 3 + Gear
Question posed: "... looking ... average gates on approach."
ALAR Briefing Notes in English | Flight Safety Foundation (http://flightsafety.org/current-safety-initiatives/approach-and-landing-accident-reduction-alar/alar-briefing-notes-english)
Specifically: Briefing Note 4.2 — Energy Management (http://flightsafety.org/files/alar_bn4-2-energymgmt.pdf) [PDF 97K]
Skybrary did a story on this subject, meant for controllers:
SKYbrary Aviation Safety (http://www.skybrary.aero/index.php/Main_Page)
18th Jul 2012, 07:06
Assuming you are on descent in Open Descent mode at 280kt, with a speed restriction of 250kt below 10,000':
Below 20,000 you can roughly multiply your altitude by 4 and it works pretty well. Ie - at 15,000' you want 60nm to run (15 x 4 = 60), at 10,000' you want 40nm to run (10 x 4 = 40).
Once you get to 8,000' at 250kt you want to be at 30nm to run.
Once you get to 5,000' at 250kt you want to be at 20nm to run.
If you manage the speed at 5,000 and reduce the speed to green dot, you should arrive at 3,000' at green dot with 10nm to run.
And below 3,000 you can simply multiply your altitude by 3 to get your distance to run.
So, simply put you can use 4 x altitude above 8,000'. Your gates to hit are 8,000' @<hidden> 30nm 250kt; 5,000' @<hidden> 20nm 250kt; 3000 @<hidden> 10nm 210kt.
Of course this is all subject to wind and your gross weight, but it gives you something to aim for.