ICAO Doc 4444
4.9.1 Wake turbulence categories of aircraft
4.9.1.1 Wake turbulence separation minima shall be based on a grouping of aircraft types into three categories according to the maximum certificated take-off mass as follows:
b) MEDIUM (M) — aircraft types less than 136 000 kg but more than 7 000 kg; and
c) LIGHT (L) — aircraft types of 7 000 kg or less.
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