User guide

3.1.9 DECISION HEIGHT (DH) ANNUNCIATION
A yellow circle with “DH” in black is
displayed when the set decision height
is reached. The annunciator does not
flash. This annunciator is not displayed
in some installations.
3.1.10 ADI FAILURE ANNUNCIATIONS
External sensor systems failures are annunciated in black text inside
a red box. Up to six different failures are displayed:
GYRO Attitude system failures. The bank angle pointer, pitch scale,
horizon line and black ground are removed from the display.
FD Flight Director system failures. The command bars are
removed from the display.
GS Loss of Glideslope Valid during ILS Approach mode. The
glideslope scale and pointer are removed from the display.
R/T Rate of Turn invalid. The rate of turn scale and pointer are
removed from the display.
RWY Loss of LOC Valid or Radio Altitude Valid during ILS
Approach mode. The localizer scale and runway symbol are
removed from the display.
SPD Loss of Speed Command Valid. The speed comand scale
and circle are removed from the display.
Dual installations perform cross-side flag monitoring and display
cross-side failures in a yellow box in the lower right corner of the ADI
display. For the failure to be displayed, 1) a red flag must have been
displayed on the cross-side display for at least two seconds, or 2) the
cross-side HSI has failed. A black number indicates the aircraft side
where the failure occurred. A red “X” annunciation in the yellow box
indicates that the cross-side status has not been received for at least
two seconds. All ADI failure flags flash for four to six seconds upon
initial display, then become steady indications.
EADI/EHSI Displays
3-4
FPD 500 FLAT PANEL DISPLAY SYSTEM
Rev. 0
Dec/97
a
N
F
DH
20
Figure 3.1-11
Decision Height Annunciator