BendixKing SG 465 System EFS 40/50 - Manual (Page 97)

EHSI Displays
N o t e : S oftware release 06
changed the DG annunciation
to HDG to better describe the
variety of heading sources that
may be interfaced with the
E F S 40/50, ie. INS, AHRS
and conventional gyros.
Dual selectable compass inputs
are provided for. If a second
compass system is installed, the
cross-side source is selected by
means of a remote mounted
switch. Once the alternate com-
pass source has been selected,
a yellow DG1 (HDG1) or DG2
(HDG2) will be displayed to the
left of the lubber line.
In a dual EFS 40/50 installation
with software release 04 or 05, if
both systems use the same
heading source, annunciations
will appear on both EHSI
’ s alert-
ing the pilots they have the same
source selected. The EHSI that is
using its normal heading source
will annunciate a yellow “DG”
with a yellow box around it to
indicate that its primary heading
source has been selected for use
on the other EHSI. The EHSI that
is using its alternate heading
source will annunciate a yellow
“DG1” or “DG2” as applicable
with a yellow box around it to
indicate the heading source
being used is the same one
being used by the other EHSI.
For example, if the co-pilot were
to select his alternate heading
source, heading #1, “DG1” would
appear with a box around it on
the co-pilot
’ s EHSI and DG would
appear with a box around it on
the pilot ’ s EHSI.
In a dual EFS 40/50 installation
with software release 06 and
above, if both systems select the
same heading source, a yellow
“HDG1” or “HDG2” with a yellow
box around it will appear on both
EHSIs alerting the pilots that they
have the same source selected.
Figure 4.1.1
SAME HEADING SOURCE
SELECTION
When two compass sources are
available, the two inputs are
compared for agreement. If the
two inputs do not fall within 6-
degrees of each other while in
level flight, a yellow comparison
warning, HDG under a double-
ended arrow, will be annunciated
to the right of the lubber line.
See figure 4.1.5, EHSI SYMBOL
DEFINITION.
NAVIGATION SOURCE
ANNUNCIATION
A vertical three- or four-letter
alphanumeric readout located on
the left or right side of the dis-
play, depending on vertical scale
side selection, indicates the sys-
tem selected as the primary navi-
gation sensor.
For dual sensor installations the
cross-side navigation system
may be selected by pressing the
1-2 push button. Example: pilot
4.1.2 Issued 8/10 SW 04/05/06/07/08/09/10/11/12/13/14/15/16
Section 4.1mp 9/9/10 1:45 AM Page 4.1.2