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References in periodicals archive ?
Advisory glidepath guidance can be generated by some avionics systems based on the vertical descent angle (VDA) published for the procedure, which is the angle between the final approach fix at its crossing altitude and the runway at its threshold crossing height. This type of vertical guidance allows pilots to descend at a constant angle, such as with LNAV+V approaches, and provides a more stabilized approach than the traditional dive-n-drive method.
The glideslope antenna is usually sited some 750 to 1250 feet from the approach end of the runway, and its signal nominally provides a 55-foot-high threshold crossing height.
AeroNav shows the minimum altitude at KNOLL right next to the fix, which they simply label as the "OM." Jepp includes the database waypoint "MA34" (missed approach fix for Runway 34), under the label for XOPYU, with which it is collocated, and clearly indicates the localizer MAP with an "M." Jepp provides the threshold crossing height (56 feet) and repeats the threshold elevation (1143) at the runway depiction, and puts the glideslope angle in the speed/time table.
In the last case, Jeppesen will calculate and supply the VDA based on crossing restrictions and the threshold crossing height.