COURSE selector. The yellow course arrow
is positioned on the heading dial by the course knob to select
a magnetic bearing that coincides with the desired VOR or
TACAN radial or localizer course. Like the heading marker,
the course arrow rotates with the azimuth card to provide a
continuous readout of course error to the flight director
Aircraft symbol. A fixed aircraft symbol
corresponds to the longitudinal axis of the aircraft and
lubberline markings. The symbol shows aircraft position and
heading with respect to a radio course and the azimuth card.
Lateral deviation bar. This bar represents the
centerline of the selected VOR, TACAN or localizer course.
The aircraft symbol shows pictorially actual aircraft position
in relation to this selected course.
HDG selector. The heading marker (heading
bug) is positioned on the rotating azimuth card and the
heading knob sets pilot selected compass heading. The
heading marker rotates with the azimuth card so the
difference between the marker and the fore lubber line index
is the amount of heading error applied to the flight director
computer. In the heading mode, the FDI vertical command
bar will display the required bank commands to bring the
aircraft onto and maintain the selected heading.
Course deviation dots. In VOR, TA* CAN or
INS operation, each dot represents five degrees deviation
from centerline. In ILS operation, each dot represents I
degree deviation from centerline.
GS flag. Indicates that the information
displayed by the glideslope pointer is invalid and should not
Glideslope pointer. Indicates deviation from
correct glideslope during ILS approach.
Fixed azimuth marks. Fixed azimuth marks
are fixed at 450 bearings throughout 360 degrees of compass
card for quick reference.
Pilot's course indicator selector switch (fig.
2-30). Selects desired source of data for display on pilot's HSI
and input to autopilot flight computer.
VOR 1. Selects data from VOR 1
VOR 2. Selects data from VOR 2
TACAN. Selects data from TACAN
INS. Selects data from INS.
Compass selector switch (fig. 2-30). Selects
desired source of magnetic heading data for display on HSI
No.1. Selects data from No.1 compass.
No.2. Selects data from No.2 compass;
c. Controls/Indicators and Functions, Copilot's HSI.
If both the pilot and copilot course
indicator switches are in the same
position, the pilot has sole control of
course select functions. The copilot
can only monitor deviation displays
from the selected system. A PILOT
SELECT annunciator will illuminate
to notify the copilot that both pilots
have selected the same receiver as the
pilot. Both the pilot and copilot can
select INS at the same time with no
When the pilot has selected INS, the
copilot has the option to select either
the VOR-I, VOR-2, TACAN or INS,
to control the copilot's HSI.
Heading marker. Indicates heading selected
by HDG knob.
COMPASS flag. Indicates that the heading
information displayed is invalid and should not be used.
Lubber line. This pointed fixed index mark
aligns with the aircraft symbol to indicate aircraft magnetic
heading on the azimuth card.
Course arrow. Indicates VOR or TA-I CAN
course selected COURSE knob.
Rotating azimuth card. The rotating azimuth
card rotates throughout 360 degrees. The rotating azimuth
card displays slaved gyro stabilized magnetic compass
information. The azimuth ring is graduated in five-degree