Jos effe Googelen
TACAN APPROACH is a non-precision approach utilizing a terminal TACAN NAVAID for azimuth and range information. The plan view and profile track provides the required courses and altitude restrictions necessary to execute the published approach. TACAN approaches can be initiated from low or high altitude. Low TACAN approaches are assumed if you request "TACAN." To request a HI-TACAN approach, you must use the term "HI-TACAN." If an enroute descent has been given from Center, you are most likely being set up for a low altitude approach. Requesting an enroute descent to a HI-TACAN would not make sense.