Freeze Calculated Landing Time

A dynamic parameter number of minutes prior to the meter fix calculated time of arrival for each aircraft when the Tentative Calculated Landing Time (TCLT) is frozen and becomes an Actual Calculated Landing Time (ACLT) (i.e., the Vertex Time of Arrival (VTA) is updated and consequently the TCLT is modified as appropriate until Freeze Calculated Landing Time (FCLT) minutes prior to meter fix calculated time of arrival, at which time updating is suspended and an ACLT and a frozen meter fix crossing time (MFT) is assigned). (FAA4)