BendixKing SG 465 System EFS 40/50 - Manual (Page 105)

EHSI Displays
will be supplied only by the on-
side LNAV with software prior to
08, but beginning with SW 08,
the off-side LNAV is used as a
secondary source of mag var
information.
If valid mag var is not available,
those bearing pointers displayed
with mag var correction will be
removed and a RED X is drawn
through the sensor annunciator
in the lower right or left corner.
In the event a heading failure
occurs, a heading flag will be dis-
played to the pilot, the compass
card will remain active to follow
input form the compass system.
Bearing pointer information will
continue to be displayed. The
E F S 40/50 will process the bear-
ing information and present all
bearing poi nter information
except ADF referenced to the
compass card, the ADF bearing
pointer will be relative to the nose
of the aircraft and lubber line on
the EHSI.
E X A M P L E :
N o t e : Refer to figure 4.1. 4
BEARING POINTER OPERA -
TION WITH LOSS OF HEAD -
ING when reviewing this
example.
Aircraft actual mag heading is
030 degrees, but EHSI com -
pass is failed and displays an
incorrect heading of 090
degrees — 60 degrees greater
than actual. Bearing pointer
number one is referenced to a
VOR station and is pointing to
120 degrees on the compass
card. Bearing pointer number
two is referenced to an ADF
station and is pointing to 180
degrees on the compass card.
When interpreting bear ing
pointer number one in this
example, remember that VOR,
TCN, RNV, OMG, FMS, GPS
or LOR indications are refer -
enced to the compass card.
Therefore, since bearing point -
er number one is pointing to
120 degrees on the compass
card, the correct course to the
VOR is 120 degrees. Like -
wise, since the tail of bearing
pointer number one is on the
300-degree mark on the com -
pass card, the correct bearing
from the VOR is 300 degrees.
Caution: Do not assume that
the course to the VOR is 30
degrees to the right of the air -
craft nose. Although the bear -
ing pointer is pointing 30
degrees to the right of the lub -
ber line, you must remember
that the pointer in this instance
is referenced to the compass
card — not the lubber line or
symbolic aircraft.
When interpreting bear ing
pointer number two in this
example, remember that ADF
indications are referenced to
the lubber line and the symbol -
ic aircraft. They are not refer -
enced to the compass card.
The compass card can be
used only to help you deter -
mine ADF relative bearing.
4.1.10 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 4.1.10