34:1 Surface Clear Stipple Symbol On RNAV approach charts, a small shaded arrowhead shaped symbol from the end of the VDA to the runway indicates that the 34:1 Obstacle Clearance Surface (OCS) for the visual segment is clear of obstacles. The absence of the symbol indicates that the 34:1 OCS is not clear or a Visual Segment-Obstacles note is indicated on the chart.
Visual Decent Point (VDP) The Visual Descent Point (VDP), is shown by a bold letter “V” positioned above the procedure track and centered on the accompanying dashed line. (See example below.) The VDP is a defined point on the final approach course of a nonprecision straight-in approach procedure from which normal descent from the MDA to the runway touchdown point may be commenced.
Both EEC’s require input from two DEU’s to operate in the NORMAL mode.If only one DEU is enerqized both EEC’s receive 1 DEU input and change to the SOFT ALTERNATE mode indicated by two amber ALT lights on the ENGINE CONTROL panel,accompanied by a MASTER CAUTION.Of course you’ll also see an amber DSPLY SOURCE indication on both PFD’s indicating that there is 1 DEU providing info to all 6 DU panels.