(redirected from Threshold Crossing Height)
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References in periodicals archive ?
In general aviation piston pounders, even in the highest performance twins, getting down and stopped on an ILS runway from a 50-foot threshold crossing height is simply not a problem.
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.
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.
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.