Commonwealth Numbered Regulations

1988 NO. 158 CIVIL AVIATION REGULATIONS - REG 170

170. In this Division, "flight level 200", in relation to a time and place,
means such a height above the ground or water that, if an aircraft were flying
at that height at that time and place and had an altimeter adjusted to a
reading on the sub-scale of 1013.2 millibars, the altimeter would show a
height of 20,000 feet.