5538
Pictorial Navigation Indicator
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1.
DME/Radar Altitude Display
-
Displays DME information referenced
to
the active navigation waypoint.
The DME display includes either
distance (nautical miles) and ground-
speed (knots) or distance and time-to-
station, as selected with the Ground-
speed/Time-to-Station Pushbutton.
During flight below
1000
feet with the
radar altimeter system operating, a
radar altitude display automatically
replaces groundspeed or time-to-
station information.
2.
Compass Card
-
Displays
magnetic heading information
received from the aircraft’s compass
system, with incremental marks
spaced five degrees apart.
3.
Lubber Line
-
Index mark for
current aircraft magnetic heading.
4.
Nav Flag -Warns that the
received navigation signal is inade-
quate for course tracking. Flight
director Nav and Approach modes
cannot be engaged with Nav Flag in
view. Loss of the navigation signal
for
15
seconds causes the flight
director to default to
Roll
Attitude
Hold.
If
the Glideslope mode is
coupled, the flight director also
defaults to Pitch Attitude Hold.
Flashing of Nav, Approach or
Glideslope annunciators, as appropri-
ate, accompanies engagement in the
default modes.
5.
Course Arrow
-
Displays the
magnetic course selected with the
Course Selector Knob on either the
KPI
5538
or remote KHC
441
Course/
Heading Controller. The Course
Arrow remains stationaly with respect
to the compass card, except during
course selection.
6.
Course Deviation Indicator
-
Indicates deviation from the selected
course with reference to the Course
Deviation Scale. If the Nav Flag is in
view, the CDI display is invalid.
7.
Course Deviation Scale
-
Measures displacement of the Course
Deviation Indicator in relation to a five-
dot scale right and left of course
centerline. Scale calibration is
different for different nav sensors.
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