The AMA is the lowest off-airway altitude to be used under Instrument Meteorological Conditions (IMC) that will provide a minimum vertical clearance of 1 000 feet (AGL), or in designated mountainous terrain 2 000 feet above all obstacles located in the area specified, rounded up to the nearest 100 foot increment.
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# Minimum obstacle clearance altitude, an altitude which provides a predetermined vertical clearance from known obstacles within a predetermined corridor along the specified flight segment.
On 20 April, another Tigerair aircraft flew below the published minimum altitude near Melbourne Airport.
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