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What is the correct flight level for an IFR flight within RVSM airspace with a magnetic track of 230?
  • A
    FL420
  • B
    FL310
  • C
    FL390
  • D
    FL380

Refer to figure.

In Non-RVSM airspace, vertical separation above FL290 is 2 000 ft. In RVSM airspace, vertical separation above FL290 is 1 000ft.

The default worldwide semi-circular rule is the East/West orientation of the flight level parity. Cruising levels are based on magnetic track. Magnetic Tracks for IFR flights:

  • Your aircraft has track between 0° and 179° => your flight level or altitude must be odd (FL50, FL70, etc.);
  • Your aircraft has track between 180° and 359° => your flight level or altitude must be even (FL40, FL60, etc.).
With regards to this question, firstly, note that the question refers to RVSM airspace.
Therefore, as you can see in the attached figure, flying a magnetic track of 230º, the appropriate Flight Levels would be: FL300, FL320, FL340, FL360, FL380, FL400.

“FL310” and "FL390"– Incorrect. These are IFR flight level for easterly (0º to 179º) directions.
"FL420"– Incorrect. RVSM airspace includes flights levels from FL290 to FL410.

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