Beechcraft C-12C Operator And Technical Reference Manual page 306

TM 1-1510-218-10
(8) Compass Synchronization Annunciator.
The compass synchronization annunciator consists of
a  and X symbol display. When the compass system
is in the slaved mode, the display will oscillate
between the  and X symbol, indicating the heading
dial is synchronized with a gyro-stabilized magnetic
heading.
(9) Course Knob.
indicator.
(10) Course Deviation
operation, each dot represents 5° deviation from the
centerline (+ 10°).
represents 1° deviation from the centerline.
(11) Aircraft Symbol.
aircraft symbol corresponds to the longitudinal axis of
the aircraft and lubber line markings.
shows aircraft position and heading with respect to a
radio course and the rotating heading dial.
(12) Heading Knob.
bug to a preselected compass heading.
(13) Glideslope Pointer/Scale.
slope pointer displays glideslope deviation.
pointer is in view only when tuned to a localizer
frequency. If the aircraft is below glideslope path, the
pointer is displayed upward on the scale. Each dot on
the scale represents approximately 0.4° displacement.
(14) Course Deviation Bar.
deviation bar represents the centerline of the selected
VOR or localizer course. The miniature aircraft symbol
pictorially shows actual aircraft position in relation to
this selected course.
(15) Heading Bug.
heading bug is positioned on the rotating heading dial
by the heading knob, and displays preselected
compass heading. The bug rotates with the heading
dial. The difference between the bug and the fore
(upper) lubber line index is the amount of heading
error applied to the flight director computer. In the
heading mode, the ADI will display the proper bank
commands to turn to and maintain this selected
heading.
The copilot's HSI also has an HDG flag which
indicates loss of heading information, a VERT flag
which covers the glideslope pointer when not receiving
glideslope information, and a NAV flag which indicates
a loss of NAV 2.
3B-16
Positions the course
Dots. In
In ILS operation, each dot
The fixed miniature
The symbol
Positions the heading
The glide-
The course
The notched orange
3B-15. PILOT'S ATTITUDE DIRECTOR INDICATOR.
a. Description.
Indicator (ADI) combines the attitude sphere display
with computed steering information to provide the
commands required to intercept and maintain a
desired flight path. It also contains an eyelid display,
expanded localizer, glideslope, radio altitude display,
rate-of-turn indicator, mode annunciators, go-around
and decision height annunciators, and inclinometer.
Any warning flag in view indicates that portion of
information is unreliable.
VOR
b. Controls/Indicators and Functions. Refer
to Figure 3B-8.
(1) Attitude Sphere. Moves with respect to
the symbolic aircraft reference to display actual pitch
and roll attitude.
increments on a blue and brown sphere.
(2) Roll Attitude Index. Displays actual roll
attitude through a movable index and fixed scale
reference marks at 0, 10, 20, 30, 45, 60 and 90°.
(3) Go Around (GA) Annunciator. Illuminates
The when go-around mode has been selected.
(4) SPD Annunciator.
airspeed is being held by the flight director in the IAS
mode.
(5) ALT Annunciator.
altitude is being held by the flight director.
(6) HDG Annunciator.
heading is being held by the flight director in the NAV
ARM or BC ARM mode.
(7) NAV Annunciator.
navigation is being controlled by the flight director, in
the NAV CAP, VOR APR mode.
(8) LOC Annunciator. Illuminates whenever
the flight director is controlling a localizer approach, in
the NAV CAP mode.
(9) APR Annunciator. Illuminates whenever
the flight director is controlling an approach, in the
NAV CAP, VOR APR mode.
(10) GS Annunciator.
the flight director is in GS CAP mode, and glideslope
has been captured.
(11) BC Annunciator.
the flight director is in BC CAP mode, and has
captured the back course approach heading.
The pilot's Attitude Director
Pitch attitude marks are in 5°
Illuminates when
Illuminates when
Illuminates when
Illuminates when
Illuminates whenever
Illuminates whenever