Top of climb
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In aviation, the top of climb, also referred to as the TOC or T/C, is the computed transition from the climb phase of a flight to the cruise phase, the point at which the planned climb to cruise altitude is completed. The top of climb is usually calculated by an on-board flight management system, and is designed to provide the most economical climb to cruise altitude, or to meet some other objective (fastest climb, greatest range, etc.). The top of climb may be calculated manually with considerable effort.