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A pilot is planning a flight from aerodrome A to aerodrome B using aerodrome C as alternate. The distance from A to B is 120 NM on a true track 090° and the distance from B to C is 60 NM on a true track 360°. If the planned TAS is 100 kt and the forecast wind 300°/20 kt, the planned flight time from A to B will be (1) _____ and from B to C will be (2) _____.
  • A
    (1) 82 min; (2) 48 min
  • B
    (1) 78 min; (2) 36 min
  • C
    (1) 88 min; (2) 33 min
  • D
    (1) 61 min; (2) 40 min

Refer to figures. 
For this question using your Navigation/Flight computer, apply the following steps twice:

1. From A to B:

  1. Set wind direction to 300° under the "TRUE HEADING" index at the top.
  2. Set the center point on the True Airspeed (TAS) of 100 kt.
  3. Mark the wind velocity 20 kt down from the centre point.
  4. Initially, set the True Track to 090° under the "TRUE HEADING" index.
  5. Note that this heading would result in 5ºR drift and a track of 095°.
  6. Reduce the heading value under the index until the heading plus the drift gives a track of 090°. This occurs at a heading of 085° with 5°R drift.
  7. The groundspeed for this track is approximately 117 kt.
  • Thus, the flight time from A to B is: 120 NM / 117 kt = 1.02 hr or 61 min.

2. From B to C:

  1. Set wind direction to 300° under the "TRUE HEADING" index at the top.
  2. Set the center point on the True Airspeed (TAS) of 100 kt.
  3. Mark the wind velocity 20 kt down from the centre point.
  4. Initially, set the True Track to 360° under the "TRUE HEADING" index.
  5. Note that this heading would result in 10ºR drift and a track of 010°.
  6. Reduce the heading value under the index until the heading plus the drift gives a track of 360°. This occurs at a heading of 350° with 10°R drift.
  7. The groundspeed for this track is approximately 89 kt.
  • Thus, the flight time from A to B is: 60 NM / 89 kt = 0.67 hr or 40 min.

Your Notes (not visible to others)



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