AIRPLANE
OPERATIONS
MANUAL
NAVIGATION AND
COMMUNICATION
REVISION 39
2-18-75
Page
19
Code
01
AOM-145/1114
IAS - Horizontal Indication. Indicates Computed
Airspeed failure. Indicated by boxed characters
replacing the Airspeed Scale in Primary Mode, and
replacing the Digital Airspeed in digital modes.
IAS - Vertical Indication. Indicates Computer Airspeed
miscompare. Indicated by boxed characters vertically
positioned at the top left portion of the airspeed scale
in Primary Mode. In all other modes, boxed “IAS” is
vertically positioned at the left side of the display.
LOC/FMS/VOR - Indicates Lateral Deviation failure. Indicated by
boxed characters “LOC”, “FMS”, or “VOR”,
corresponding to the selected navigation source, in
the lower center of the display.
LOC COMP - Indicates Ground Roll Localizer miscompare, during
a low-visibility takeoff. Indicated by boxed characters
and removal of the ground localizer pointer.
LOC/ILS - Indicates Localizer miscompare. Indicated by boxed
characters in the lower left portion of the display.
RA - Center. Indicates all Radio Altitude failure.
RA - Lower Left Portion. Indicates Radio Altitude
miscompare. Indicated by boxed characters in the
lower left portion of the display.
RA1 - Radio Altitude source is RA1 and RA2 is failed.
Indicated by boxed characters in the lower left
portion of the display.
RA2 - Radio Altitude source is RA2 and RA1 is failed.
Indicated by boxed characters in the lower left
portion of the display.
RWY LEN - Indicates Runway Length Out of Range. Indicated by
boxed characters displayed beneath the Runway
Length for five seconds.
SG1 (2) - Indicates the Symbol Generator Source selected.
“SG1” indicates that SG1 is selected as both Pilot’s
and Copilot’s SG source. “SG2” indicates that SG2 is
selected as the Pilot’s SG source. Positioned in
upper left portion of the display.