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[Descent] planning
08-24-2020, 09:37 PM
#1
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Posts: 19
[Descent] planning
Thinking about a new topic, planning the decent it only works at out stations or low traffic volumes etc. I find 100 nm out power to idle works very well in the mid to upper 30's any idle thruster decenters care to comment
Last edited by rickair7777; 08-25-2020 at 07:56 AM. Reason: Title Accuracy
08-24-2020, 09:58 PM
#2
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Joined APC: Jan 2015
Posts: 52
Originally Posted by Keroburner410
Thinking about a new topic, planning the decent it only works at out stations or low traffic volumes etc. I find 100 nm out power to idle works very well in the mid to upper 30's any idle thruster decenters care to comment
08-24-2020, 10:32 PM
#4
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Joined APC: Oct 2017
Posts: 921
Take altitude lose in thousands of feet then multiply it by three. Start your descent at least that far out, I add 2 miles myself. Take your ground speed cut it in half and add a zero, eg. 440kts = 220 = 2200fpm then add two hundred because that isn’t a perfect conversion now you are at 2400 fpm and then down you go, cross check 3 miles for every thousand feet and adjust vs for changes in GS. That’s what I use if I’m having to fly raw data for whatever reason. Works like a charm. And if you are raw data without a GS indication just ask ATC what your GS is before you start down and adjust VS to keep losing 1000ft for every 3 miles.
08-24-2020, 11:01 PM
#5
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Joined APC: Oct 2014
Posts: 219
for the Crj you can make a 30 mile ring from the airport and set it to 11000 and see what the fms say should be your descent rate. I rarely do a power idle descent from cruise but remain lower on the thrust levers.
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08-24-2020, 11:20 PM
#6
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Joined APC: Jan 2010
Posts: 13
When to descend...
The quick & dirty is the old 3 to 1 rule plus any head/tail-wind factored in usually works to a 30 to 10 point that is 30 miles out at 10,000 feet where you need appx. 2 extra miles to slow to 250 kts while descending (most FMS equipped aircraft do this automatically, anyway) . However, most major airports around the world have long implemented the Continuous Descend Arrival (CDA) procedure built into their STARs. Last but not least is the FAA's Next Gen Optimised Descend Profile (ODP) that has been test run for the LAX arrivals which allows a constant Idle-trust all the way from Top of D to touch down, after all beyond the TD it's not what crew wants or can do it's what ATC wants you to do.
08-25-2020, 12:25 AM
#7
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Joined APC: May 2009
Posts: 2,035
Originally Posted by Keroburner410
Thinking about a new topic, planning the decent it only works at out stations or low traffic volumes etc. I find 100 nm out power to idle works very well in the mid to upper 30's any idle thruster decenters care to comment
For a "decent" descent, always include the "S"!
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