ESI-500
Pilot’s Guide3-18
Display Features
Lateral Deviation Indicator
The lateral deviation indicator is used for VOR, Localizer, and GPS
guidance. It is centered in the lower attitude display area below the
pitch ladder. The indicator consists of a lateral deviation scale and
diamond shaped pointer. Refer to Figures 3-10, 3-11, and 3-12.
The color of the deviation pointer is the same as the navigation
information. If the deviation scale is exceeded the deviation pointer
remains xed at the far edge of the scale.
The lateral deviation pointer is centered in the middle of the lateral
deviation scale when the lateral deviation is tracking to the desired
course.
The ILS BC mode reverses the lateral deviation so that a backcourse
may be own such that a displayed left deviation indicates y left,
and a displayed right deviation indicates y right. The BC mode only
applies if the Direction display of heading or track is congured. Refer
to Figures 3-11. (E.g., for a localizer backcourse approach to runway
9, if the inbound course to Runway 9 is 090°, then the selected course
should be set to the reciprocal value 270°.) The ESI-500 detects
the aircraft direction (090°) is opposite from the course (270°), and
indicates the ‘B/C’ approach type.
The lateral deviation pointer is removed and a red ‘X’ is drawn over the
lateral deviation scale, when data being received from the navigation
receiver is missing or failed.
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