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Given the following information, at what time will the PET be reached?

Leg distance: 1000 NM
Leg track: 090°
TAS: 200 kt
Wind: 090°/20 kt
Departure time: 12:00

  • A
    14:45
  • B
    15:03
  • C
    14:30
  • D
    14:47

Refer to figure.
Solving from Heading (HDG) & Ground Speed (GS), knowing WV, TAS and required track.

1. Set wind direction to 090º under the "TRUE HEADING" index at the top.
2. Set the center point on the True Airspeed (TAS) of 200 kt.
3. Mark the wind velocity 20 kt down from the centre point.
4. Initially, set the True Track under the "TRUE HEADING" index.

  • GS home: 270º
5. The groundspeed for this track is approximately 220 kt.
  • GS out: 090º

5. The groundspeed for this track is approximately 180 kt.


We can now apply the formulas:
Distance to PET = (GS home x Distance) / (GS out + GS home)
Distance to PET = (220 x 1000) / (180 + 220)
Distance to PET = 550 NM

Time to PET = Distance to PET / GS out
Time to PET = 550 / 180 = 3 h 3 min


  • PET will be reached at:
  • Departure time + Time to PET = 12 h + 3 h 3 = 15 h 3

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