TM 1-1510-223-10
Figure 3-8. Display Controller
When power is first applied to the EFIS, the EHSI will
display a full 360 degree compass mode. Depressing
the FULL/MAP switch once will change the display to a
90 degree heading arc with a large course pointer.
Depressing the switch again selects a 90 degree
heading arc display with a navigation map display that is
dependant upon the selected navigation source.
(2)
Weather pushbutton selector switch. The
weather pushbutton selector switch, placarded WX, is
used to select weather radar and lightning sensor
system data to be displayed on the partial compass
heading arc display or the map display on the EHSI. If
the EHSI is in the full compass mode, depressing the
WX switch will change the display to the partial compass
mode and display weather radar returns and lightning
sensor system data Depressing the switch again will
remove the weather radar returns and lightning sensor
system data from the display.
(3)
Groundspeed/time-to-go
pushbutton
selector
switch.
The
groundspeed/time-to-go
pushbutton selector switch, placarded GSPD/TrG, is
used to select whether groundspeed or time to go will be
displayed on the lower right comer of the EHSI.
GSPD/TTG data is always INS data if the INS is
functioning. The GSPDFITG field will be blank unless
INS is the selected navigation source. If the INS is not
functioning, the GSPD/TTG field will be dashed
(4)
Attitude pushbutton selector switch. The
attitude pushbutton selector switch, placarded ATT is
used to select whether attitude source # 1 (vertical gyro
# 1), attitude source #2 (vertical gyro #2), or attitude
source #3 (inertial navigation system) will provide pitch
and roll information to the respective EFIS. Each
depression of the switch changes the attitude source
and the respective EADI.
NOTE
The attitude display on the EADI will power up
to the previously selected attitude source.
(5)
Heading pushbutton selector switch. The
heading pushbutton selector switch, placarded HDG, is
used to select whether gyro-magnetic compass system
# 1 or # 2 will supply heading information to the
respective EHSL Each depression of the switch will
cause the display on the EHSI to alternate between
MAG1 and MAG2, unless the SLAVE/FREE switch is
set to FRE-, then DG1 or DG2 will be displayed.
(6)
VOR/localizer pushbutton selector switch.
The
VOR/localizer
pushbutton
selector
switch,
placarded V/L, is used to select which VHF navigation
receiver will provide information to the respective EFIS.
Each depression of the switch alternates the navigation
source display
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