BendixKing SG 465 System EFS 40/50 - Manual (Page 143)

EADI Displays
• Yellow Degraded sensor color
RADIO ALTIMETER
o
The radio altimeter display is
composed of three elements;
radio altimeter (RA) height, deci-
sion height (DH) set and decision
height (DH) alert. In the upper
right corner of the display, a field
of white alphanumeric data pro-
vides radio altimeter height and
annunciation. In the lower right
corner of the display, a green
alphanumeric field displays the
selected DH. This field is active
only when the DH set knob is
active or when the radio altimeter
is providing valid height data. To
the right and above center of the
display, a yellow “DH” alert is dis-
played in a black box outlined in
y e l l o w .
Depending on the type of radio
altimeter installed, the elements
of data displayed may vary. An
altimeter which fully supports the
interface will provide display of all
three elements; RA, DH set and
“DH” alert. Altimeters which do
not fully support the interface
may be limited to the “DH” alert
annunciation. In such an installa-
tion, selected DH will not be dis-
played. DH set is accomplished
outside the EFS 40/50 system on
the radio altimeter. The
E F S 40/50 receives an external
command from the altimeter
which activates the “DH” alert
a n n u n c i a t i o n .
Radio altimeter (RA) height dis-
play range is -20 to 2,500 feet.
Between -20 and 100 feet, height
will be displayed in five foot incre-
ments. Above 100 feet, height
will be displayed in 10 foot incre-
ments for EFS software before
09. Beginning with 09 software,
RA altitude is displayed in 5 foot
increments between -20 and 500
feet with 10 foot increments dis-
played above 500 feet. Selection
of decision height and activation
of “DH” alert will be in 1 foot
increments. The maximum and
minimum height displayed will
depend on the radio altimeter
installed. Some radio altimeters
provide linear altitude information
only to 1,000 feet. Refer to the
operators handbook for the par-
ticular radio altimeter installed for
details on the possible display
r a n g e .
N o t e : 20 ft is the minimum alti -
tude displayed when a KRA
10A is the configured radio
altimeter.
To annunciate an operational
radio altimeter which has not
acquired a valid ground
response, three white dashes are
placed in the height data field. If
the radio altimeter has failed,
three RED dashes are placed in
the height data field. In either
case, if the rising runway is dis-
played, it will remain fixed at the
bottom of its scale and moves
laterally to indicate the LOC or
MLS deviation.
4.2.8 Issued 8/10 SW 04/05/06/07/08/09/10/11/12/13/14/15/16
Section 4.2mp 10/13/10 2:54 AM Page 4.2.8