In the vicinity of an aerodrome of intended landing or used for take-off, the vertical position of aircraft shall be expressed in terms of...
Refer to figure.
ICAO Doc 8168
2.1.4 References to vertical position
2.1.4.1 The vertical position of aircraft operating at or below the transition altitude shall be expressed in terms of altitude. Vertical position at or above the transition level shall be expressed in terms of flight levels. This terminology applies during:
a) climb;
b) en-route flight; and
c) approach and landing (except as provided for in 2.4.3, “References to vertical positioning after approach clearance”).
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