Refer to GSPRM Jeppesen Chart E(LO)2.
You are flying at FL 360, heading NW and ATC tell you you have to be at FL 200 over ELVOS. How far from TRENT (N53 03 W001 40) should you start your descent?
TAS 420
ROD 2000 Ft / Min
We should descent from FL 360 to FL 200 so the difference is 16 000 ft.
ROD 2000 ft / Min = 8 min
8 min at TAS 420 = 56 NM
Refer to Chart => Distance TNT to ELVOS = 25 NM
TOD 56 + 25 NM = 81 NM from TNT
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