RVSM (Reduced Vertical Seperation Minima) airspace exists in Australia. Meaning that for approved aircraft, it's 1,000ft vertically, and for non approved aircraft it's 2,000ft vertically.
You may occassionally hear an aicraft request an RVSM level (above FL280) followed by the phrase "Negative RVSM". Simply means they are not approved to operate to RVSM standards, and therefore must be given the 2,000ft clearance at all times.
Mick
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