BendixKing SG 465 System EFS 50 - Manual (Page 100)

EADI Displays
4.2.6 Issued 4/95 SW 06/07/08/11
bottom of its scale and moves
laterally to indicate the LOC or
MLS deviation.
DECISION HEIGHT SET
A part time green alphanumeric
readout, located in the lower right
corner, displays the letters DH
and selected decision height in
feet as manually established by
the DH set control knob. With
the control pulled out, the DH set
value is displayed and may be
set regardless of aircraft altitude.
With the control knob “in”, DH is
displayed only for radio altimeter
altitude less than 2500 feet AGL.
The DH set display range is from
“OFF” (-1 ft.) to the RA declutter
value (2,500’). Refer to Figure
4.2.2.
DECISION HEIGHT ALERT
When the radio altimeter height
is equal to or less than the select-
ed decision height, the DH
annunciator will be displayed.
When first activated, the DH
annunciator will flash for 10 sec-
onds. The DH symbol is a large
yellow “DH” on a black back-
ground enclosed by a yellow box,
located to the right of the pitch
scale and above the horizon line
when in normal attitude. Refer to
Figure 4.2.2.
PRECISION APPROACH
MODE FORMAT
The precision approach mode
display is obtained by selecting
an ILS or MLS navigation source.
On the ED 551A used as the
EADI, the full sky/ground display
is reduced in size to provide a
high contrast black background
for various scales and annuncia-
tions. A rising runway symbol is
provided for the display of
expanded left/right deviation and
runway closure during the final
200 feet of radio altimeter height.
The rising runway center line, ref-
erenced to the lateral deviation
scale, will provide LOC or MLS
deviation. A “LOC” or “MLS”
annunciation identifies the navi-
gation mode. A vertical scale is
provided to display ILS or MLS
glide path. Refer to Figure 4.2.2.
After software release 07 “LOC”
or “MLS” are only annunciated
when both approach sensors are
installed. If only one type is
installed, the lateral deviation
scale will not annunciate the nav-
igation mode.
EXPANDED LATERAL
DEVIATION SCALE
Located at the bottom center of
the EADI, displayed in white, with
4 hollow circles and a center dia-
mond is the expanded lateral
deviation scale. This scale pro-
vides a reference for ILS or MLS
lateral deviation. As an expand-
ed scale, it represents 1/2 full
scale deviation as displayed on
the EHSI. When the selected
course and aircraft heading differ
by more than 105 degrees, the
left/right sensitivity is reversed
and a green (onside) or yellow
(offside) BC is displayed left of
the center diamond to alert the