TM 1-1510-224-10
c.
EADI
Amber
Caution
and
Failure
annunciators (fig. 3-10).
(1)
Same attitude source. There is no
attitude source annunciated if the pilot and copilot are
using their normal attitude sources. Selecting other
attitude
sources
causes
the
new
source
to
be
annunciated in white. If the pilot and copilot have
selected the same attitude source, that attitude source
will be annunciated in amber on both EADI's.
(2)
Comparison monitor. The comparison
monitor compares selected pilot and copilot input data in
the symbol generator. If the difference between the data
exceeds predetermined levels, the out-of-tolerance
symbol will be displayed. Table 3-2 shows comparison
monitor symbols and miscompare levels.
NOTE
When the compared pitch and roll
attitude or glideslope and localizer
signals are out of tolerance, a
combined symbol (ATT or ILS) is
'displayed.
(3)
Radio altitude failure. Radio altitude
failure is indicated by amber dashes replacing the
numerical altitude value, and the removal of the rising
runway
radio
altitude display from the EADI, if present.
(4)
Decision height warning. If a DH
potentiometer is open, or during self test, amber dashes
will replace numerical values of decision height display.
(5)
Autopilot status messages. The following
messages may appear for autopilot status. They will
replace the autopilot engage (AP ENG) annunciator:
(a)
AP ENG. Autopilot engaged.
(b)
AFCS? Autopilot wraparound signal
failure.
(c)
TCS ENG. Touch control steering
is engaged.
(6)
Flight director failure. In the event of a
flight director failure, an amber FD FAIL warning will be
displayed on the EADI.
(7)
Air data command failure. If an air data
flight director mode has been selected, and the air data
computer fails, amber dashes will replace the numerical
values in the air data command display.
Figure 3-11. EADI Failure Annunciations (Red)
3-29
