airplane wizard
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- Joined
- Mar 30, 2006
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If I'm at FL330 and get cross TWINS at 110 and 250 you get this: (6 to 1)
330 - 290 = 4000 .. 4 * 6 = 24 miles. ; (3 to 1) 290 - 110 = 18000 ... 18 * 3 = 54 miles . ; 24 + 54 + 4 (for slow from 300 to 250) - 10 (for avg 50kt headwind for example) equals 72 .... So start descent 72 miles from twins.. (some guys may use 2 to 1 but I think 3 works better for the diamond elite HVC happiness)
Oh .. And do that every few thousand feet on the way down to check progress
Edit: oh and if you are in icing conditions or anticipate it, that changes things too
Thanks...Does icing increase or decrease the distance?
We don't have any actual ground-speed readout.
3:1 doesn't work on the -9. To hold pressurization while descending aboving FL290, you can't go to flt idle. Only flt idle below FL290, and then it's 2:1.
I thought the same thing when checking out on it, but 3:1 really doesn't work...on -9.
Used rule of 3's in the Lear. Amount of altitude to lose, drop the 0's, then multiplied by 3. 33000 to 11000, 22x3 = 66 miles from the fix at a 3000 fpm descent. Rinse and repeat a few times on the way down to verify combined with the TLAR method. Add in 7-10 miles if you have to slow to 250 at the end of the descent.
Would this work in the -9 as well? (thread got my curiosity)
If you've got a DME and a clock you just count how many 1/10's of a mile you fly in 36 seconds and add a zero!
Fly it like a -200 baby!
Gup
I gotcha. I always used a fixed rate, 3000 fpm in the Lear. It was a good ballpark number.It is the same formula as he showed me in his example. Alt need to lose*3 drop the zeros for a 3:1 and alt to lose*6 and drop the zeros for a 6:1. tailwind/icing/slowing down increase the distance, headwind decreases the distance.
Is that a fixed rate of descent or how does equate to feet/min?
Never had the opportunity for that to happen, but in my 30's I flew Dash 8 that I rode on when I was a teenager.So how many of you have flown the same tail number your dad flew?
So how many of you have flown the same tail number your dad flew?
How many of you have been with the same FA's that your dad was with........
Speaking of neat feats...the first time I sat in the 717 I gazed in puzzled amazement at the utter complexity of the window mechanism for a good five minutes. I'm still in awe of the engineers who created that contraption.
How many of you have been with the same FA's that your dad was with........
Same way with the lie flats on the 777. The first time I sat in first and the FA came over before landing and said my seat wasn't erect enough for my airbag to deploy, I about laughed her off the jet thinking she was being funny. I didn't think anything more about it until we got the lie flats on the ER several months later and watching the training videos - there sure are airbags!