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What is the lowest possible VFR flight level if a true course of 181° is selected and a variation of 3° east exists?

  • A

    FL050

  • B

    FL060

  • C

    FL055

  • D

    FL065

Refer to figure.
The ICAO VFR semicircular rule of flight level and/or altitude is based on the magnetic tracks. So, firstly, convert the true course into magnetic track:

T V M
181° 3°E 178°

Use the rhyme: "Variation East, Magnetic Least".

According to the rule:

  • For magnetic tracks between 0° and 179° (easterly magnetic tracks), the flight level or altitude must be odd + 500 ft.
  • For magnetic tracks between 180° and 359° (westerly magnetic tracks), the flight level or altitude must be even + 500 ft.

Since our Magnetic Track is 178°, we must choose an odd flight level + 500 ft: FL055 (pressure altitude 5500 ft).

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