TM 55-1510-220-10
(6)
COURSE indicator. Provides a digital
readout of the selected course.
(7)
VOR
LOC
flag.
Flag
indicates
that
information derived from the selected navigational I source
(VOR, TACAN or INS) is invalid and should not be used.
(8)
COURSE selector. The yellow course arrow
is positioned on the azimuth card 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 computer.
(9)
Lateral deviation bar. This bar represents the
centerline of the selected VOR, TACAN, INS or localizer
course. The aircraft symbol shows, pictorially actual aircraft
position in relation to this selected course.
(10)
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 radial course and the rotating
azimuth card.
(11)
TO-FROM
Pointers.
Two
TO-FROM
pointers are situated 180 degrees apart. The one which is
visible points toward the station along the selected VOR, or
TACAN radial or INS waypoint.
(12)
HDG Selector. The heading marker is
positioned on the rotating azimuth by the heading knob and
displays preselected 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.
(13)
Course deviation dots. In VOR, TACAN, or
INS operation, each dot represents five degrees deviation
from centerline. In ILS operation, each dot represents one
degree deviation from centerline.
(14)
GS flag. Indicates that the information
displayed by the glideslope pointer is invalid and should not
be used.
(15)
Glideslope pointer. Indicates deviation from
correct glideslope during ILS approach.
(16)
Fixed azimuth marks. Fixed azimuth marks
are fixed at 45° bearings throughout 360 degrees of
compass card for quick reference.
(17)
Copilot's course indicator selectors switch
(fig. 2-30). Selects desired source of data ford display on
copilot's HSI and input to autopilot.
(a)
VOR 1. Selects data from VOR 1
system.
(b)
VOR 2. Selects data from VOR 2
system.
(c)
TACAN. Selects data from TACAN
system.
(d)
INS. Selects data from INS.
(18)
Copilot's compass selector switch (fig. 2-30).
Selects desired source of magnetic heading data for display on
HSI compass card.
(a)
No.1. Selects data from No.1 compass.
(b)
No.2. Selects data from No.2 compass.
3-20. FLIGHT DIRECTOR INDICATOR.
a.
Description. The flight director indicator (FDI) (fig.
3-13) is the pilot's basic attitude horizon indicator and the
attitude direction instrument for the automatic flight control
system.
b.
Controls/Indicators and Functions.
(1)
Vertical steering bar. Displays computed roll
commands from flight director computer.
(2)
Lateral steering bar. Displays computed
pitch commands from the flight director comput
(3)
Bank angle pointer. Indicates aircraft bank
angle.
(4)
Bank angle index. Reference indicating zero-
degree bank.
(5)
Bank angle scale. Allows measurement of
aircraft bank angle from zero to 60 degrees.
(6)
Horizon line. Affixed to sphere, remains
parallel to the earth's horizon.
(7)
CMPTR
flag.
Presence
indicates
a
malfunction within the autopilot computer.
Change 2
3-25
