primary differences between the PFD symbology ( Fig. 5) and the HUD symbology were that the PFD had an alpha- numeric readout of the current DA, the radar altitude was displayed above the altitude tape instead of below, and the vertical speed was represented by a trend arrow instead of a numeric readout. Like the HUD, radar altitude was digitally displayed under the FPM when below 500 ft AGL. Like the HUD, a glideslope reference line was drawn on the PFD at the DFW Runway 18R ILS descent angle of 3.0 degrees. Also, a runway outline symbol was drawn using the threshold coordinates of the DFW 18R/36L runway based on the simulated aircraft navigation solution to conformally position the symbol
approach lightsBy Mace Williams
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