freeze calculated landing time


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freeze calculated landing time (FCLT)

A dynamic parameter number of minutes prior to the meter-fix calculated time of arrival of each aircraft when the TCLT (tentative calculated landing time) is frozen and becomes an ACLT (actual calculated landing time). That is, the vertex time of arrival, or VTA, is updated and, consequently, the TCLT is modified as appropriate until the FCLT minutes prior to the meter fix is the calculated time of arrival. At this time, updating is suspended, and an ACLT and a frozen meter-fix crossing time (MFT) are assigned. See also actual calculated landing time and vertex time of travel.