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(For this question use annex 033-053 rev. 05.11.2004).
For a long distance flight at FL 370, "Long Range" regime, divided into four flight legs with the following specifications:

segment AB – Ground distance: 2 000 NM, headwind component: 50 kt
segment BC – Ground distance: 1 000 NM, headwind component: 30 kt
segment CD – Ground distance: 500 NM, tailwind component: 70 kt
segment DE – Ground distance: 1 000 NM, headwind component: 20 kt

The total air distance is approximately:

  • A
    4 800 NM
  • B
    4 820 NM
  • C
    4 580 NM
  • D
    4 940 NM

Refer to figure.

Segment AB: 2240 NAM
Segment BC: 1072 NAM
Segment CD: 436 NAM
Segment DE: 1048 NAM
TOTAL DISTANCE = 4796 NAM

Note: Interpolations are demonstrated in the attached figures.

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