Common symbol generator. When in the
reversionary mode and one symbol generator is driving
both the pilot's and copilot's display tubes, an amber
reversionary warning is given to indicate the information
EADI Red Failure Annunciations (fig. 3-11).
Attitude failure. If the attitude display,
pitch scale, or roll pointer fail, they will be removed from
the display, the attitude sphere will become blue, and a
red ATT FAIL will be displayed on the EADI.
Glideslope, expanded localizer, and rate-
of-turn failures. If the glideslope, expanded localizer, or
rate-of-turn system fails, the pointer will be removed and
a red X will be drawn through the scale. The letter G will
remain at the zero deviation position to identify invalid
Internal failure. If an internal failure
occurs within the display system itself, the display will be
blank. A failure of the input/output processor will be
indicated by a red X centered on the display with a SG
FAIL annunciated (fig. 3-12).
Description. The electronic horizontal situation
indicator (fig. 3-13), combines several displays to
provide a map-like display of aircraft position. The
indicator displays aircraft displacement relative to a VOR
or TACAN radial, inertial navigation system guidance,
and localizer and glideslope beam. The EHSI provides
Full compass displays Heading
Course or azimuth deviation
SG FAIL IS AMBER ON THE EHSI.
Figure 3-12. EADI Input/Output Processer Failure Indications