An aircraft is on an IFR flight executing a circling approach. A descend below the MDA should not be made until:
1. The pilot has the landing threshold in sight
2. Visual reference has been established and can be maintained
3. The required obstacle clearance can be maintained and a landing can be made
4. The lights of the circling manoeuvre in sight
ICAO Doc 8168
Chapter 7 - VISUAL MANOEUVRING (CIRCLING) AREA
7.3.3 Minimum descent altitude/height (MDA/H)
When the OCA/H is established, an MDA/H is also specified to allow for operational considerations. Descent below MDA/H should not be made until:
a) visual reference has been established and can be maintained;
b) the pilot has the landing threshold in sight; and
c) the required obstacle clearance can be maintained and the aircraft is in a position to carry out a landing.
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