CHAPTER 5 REFERENCE GUIDE
EFD1000/500 MFD Pilot’s Guide
Page 5-72 091-00006-001 REV B
EFD1000/500 MFD Pilot’s Guide
Page PB091-00006-001 REV B
5.4.2.1. Vertical Deviation Indicator (VDI)
The secondary HSI displays the VDI scale and diamond only when a vertical deviation
signal is available (Figure 5-90). The VDI scale and symbol (diamond) display to the left
of the direction indicator when:
• A VHF navigation radio is selected as the CDI Navigation source, the radio is in ILS
mode, and is receiving valid localizer and glide slope data.
• GPS mode is active, the GPS is in approach mode and valid, and a valid GPS vertical
deviation signal is being received.
Vertical deviation is represented on the VDI scale by the position of the tip of the
VDI diamond at the scale dot that corresponds to the received or computed vertical
deviation value. When the vertical deviation exceeds the displayable range, the VDI
symbol is a hollow “ghosted” diamond pegged on the appropriate edge of the scale.
Figure 5-90
Secondary HSI
Displaying the VDI
NOTE
The VDI scale and symbol (diamond) will not display
when LOC (BC) mode is active.
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