BendixKing SG 465 System EFS 50 - Manual (Page 156)

Fault Annunciations
6.1 Issued 4/95 SW 06/07/08/11
GENERAL
EXTERNAL SYSTEM FAILURES
◗ HEADING
Once a heading failure is detect-
ed, the EHSI lubber line and
course pointer head and tail are
removed. The lubber line is
replaced by a RED box with a
RED HDG inside it. The course
deviation scale is frozen horizon-
tally to perform the function of a
conventional CDI. Selected
course reference is provided by
the alphanumeric CRS readout in
the upper left corner. If heading
was configured for display on
EADI horizon line, a RED box
with a RED HDG inside it will be
displayed upper left of center.
During a heading failure the auto-
matic Back Course function nor-
mally performed by the EFS 50
FAULT ANNUNCIATIONS
system is inhibited. Refer to Fig-
ure 6.2 and 6.3.
◗ ATTITUDE
Once an Attitude failure is detect-
ed, the pitch scale, roll scale, sky
pointer, horizon line, heading
tape, blue sky and brown ground
are removed from the display. A
RED box with a red “ATTITUDE
FAIL” inside it is displayed on a
black background in the upper
center of the display.
◗ FLIGHT DIRECTOR
Once a Flight Director failure is
detected a RED box with a red
“FD” inside it will be displayed on
the upper right side of the EADI.
Refer to Figure 6.3, EADI Faults.
EFS 50 SYSTEM FAILURES
◗ DU—DISPLAY UNIT LOSS
OF COOLING
A yellow DU enclosed in a yellow
box is annunciated at the bottom
left center of the EHSI or bottom
left of the EADI when insufficient
airflow is detected in the Display
Unit. Once annunciated, the
faulty Display Unit will continue to
operate for at least 30 minutes if
the rated ambient temperature is
not exceeded. To extend the
operating time, reduce display
information and brightness to a
minimum. Refer to Figure 6.1
and 6.3.
◗ SG—SYMBOL GENERATOR
LOSS OF COOLING
A yellow SG enclosed by a yel-
low box is annunciated at the
bottom right center of the EHSI
and bottom left of the EADI if
insufficient airflow is detected in