Thanks dad!
It is the standard figure then. At that speed and range we would need approx 2500'/min (3x's range descent at 5x's groundspeed). This would IMHO require thrust but a 4500'/min descent at 300kts indicated clean idle thrust until fl120 then 240 kts 1500'/min requires 24+32=56NM so I would have started down earlier. (I think I have my maths correct. It is so much easier in the aircraft.)Sorry just realised I did it from fl 240 and I can't be arsed to redo it! But you get the idea.
There are huge increases in efficiency by delaying the descent but I wouldn't think a pilot would continue with
themselves up but mucking up the descents time and time again
. It's a constant learning process in aviation.
Thanks for all who contributed but I think it is time to kill this one for good.
PM me if you want tho.
D and F
All comments contained within are my own! At no point do I profess these to be company policy and all SOP's must be adhered to all times.
End of the legal bit
