Since nobody else has mentioned it. When planning for when you should be starting your descent, a general rule of thumb is the “3 to 1” rule. For every 1,000ft you need to loose, you need 3 miles. So if I’m at 30,000 ft and I want to be at 3,000ft 10 miles from the airport, I will need 81 miles to descend. + the 10 from the airport so 91 miles from the airport I want to descend. (30,000-3,000= 27,000) (27×3= 81) (81+10= 91)
So if ATC hasn’t started me down by then, I’ll go ahead and request lower.
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