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Refer to E(LO)-3 chart from Jeppesen GSPRM 2017. A flight with MRJT is planned from Glasgow to Valencia. Part of the route is along A34/UN85934, from SITET (50º06'N, 000º00'E/W) to L'AIGLE VOR (LGL, 48º47'N, 000º32'E). The TAS is 382 kt and the W/V is 110º(M)/30 kt. Calculate the flight time for this portion of the flight:
  • A
    9 min
  • B
    13 min
  • C
    17 min
  • D
    22 min

Refer to figure.
We can readily see that from SITET to DEAUVILLE NORMANDIE and from DEAUVILEE NORMANDIE to L’AIGLE the tracks are not the same, therefore we will need to calculate the Ground Speed separately using the flight computer.

(1) From SITET to DEAUVILLE NORMANDIE VOR:

Track: 167ºM
TAS: 382 kt
W/V: 110ºM/30 kt

Calculate the Ground speed using the flight computer:

  1. Set Wind Direction of 110ºM under True Index.

  2. Mark wind Velocity up from center point – let’s say, set centre point over TAS of 382 kt and mark wind speed (30 kt) up.

  3. Set True Course of 167ºM under True Index.

  4. Slide wind Velocity mark to True Air Speed of 382 kt.

  5. Ground Speed reads under center: 365 kt

Distance between SITET and DEAUVILLE = 26 NM + 23 NM = 49 NM
Flight Time = Distance / Speed = (49 x 60) / 365 = 8 minutes

(2) From DEAUVILLE to L’AIGL VOR:

Track: 166ºM
TAS: 382 kt
W/V: 110ºM/30 kt
Ground Speed (which is calculated as described above): 364 kt

Distance between DEAUVILLE and L’AIGLE = 32 NM
Flight Time = Distance / Speed = (32 x 60) / 364 = 5 minutes

  • Total flight time = 8 min + 5 min = 13 min

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