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According to ICAO Annex 2, which of the following is a correct cruising level, unless otherwise specified, when operating in non-RVSM airspace under IFR with a TT of 010? and a MT of 355?
  • A
    FL340
  • B
    FL330
  • C
    FL310
  • D
    FL320

Refer to figure.
In RVSM airspace, vertical separation above FL290 is 1 000ft.
In Non-RVSM airspace, vertical separation above FL290 is 2 000 ft => According to the semi-circular rule, aircraft travelling on the same direction will be separated by twice the vertical separation => 2 000 x 2 = 4 000 ft.

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 NON-RVSM airspace.
Therefore, as you can see in the attached figure, flying a magnetic track of 355º, the appropriate Flight Levels would be: FL310, FL350, FL390.

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