2.7 Semi-Circular Rule

FLIGHTS OBLIGED TO COMPLY WITH THE SEMI-CIRCULAR RULE

2.7.1 The following flights are obliged to comply with the Semi-Circular Rule when in level cruising flight:-

  1. IFR flights outside of controlled airspace;
  2. VFR flights, except those operated in class B, C, D and E airspace’s, operating at 1500ft or more above the surface of the earth.
  3. All flights at night outside of controlled airspace.

RVSM (Reduced Vertical Separation Minima)

2.7.2 XZ division airspace is operating with RVSM as of 25th September 2008, 0001Z.

2.7.3 See the IVAO HQ Training documentation for information on RVSM & Semi-Circle, HERE

2.7.4 Read this more comprehensive document if you more interested in RVSM. This is a Non-IVAO document and is only provided for interesting reading.