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Somewhere, a 727 captain is rolling in his grave at the loss of the mental 3:1 descent planning calculation...
VNAV Baby But yah, take the number of feet to lose times it by 3
At FL Level 350 / Cross X Fit At 15,000 feet = 20,000 feet to descent (20 x 3 = 60), Also, you might want to add 10 miles for the initial pitch down and level off delay. Than, take the GS and divide it by 2. So 500 KIAS / 2 = 250 (add a 0) = 2500 FPM.