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3-3-34. Controls and Indicators - Horizontal Situation
Indicators. (fig, 3-3-6)
CONTROLS/
INDICATOR
FUNCTION
Compass Card The compass card is a 360
scale that turns to display
heading data obtained from
the gyro magnetic compass
(AN/ASN-43). The helicopter
headings are read at the upper
lubber line.
Bearing Pointer No. 1 The pointer operates in conjunction
with doppler or
mixed GPS/DOPPLER. With
Doppler Only, indicates
magnetic bearing to doppler
destination. With mixed
GPS/Doppler, indicates
magnetic bearing to GPS
destination. (With GPS Only,
bearing information is not
available.)
Bearing pointer No. 2 The pointer operated in conjunction
with selected VOR
or ADF receiver. The pointer
is read against the compass
card and indicates the magnetic
bearing to the VOR or
ADF station.
Course Deviation Indicator.
This indicator indicates
lateral deviation from selected
VOR course or GPS/
Doppler computed course or
heading in the case of FM
homing. When the helicopter
is flying to correct course,
the course indicator will be
aligned with the course
pointer and will be centered
on the fixed aircraft symbol.
The two dots on either side
of the indicator indicate
amount of course deviation.
One dot displacement is
equivalent to 5 off VOR or
GPS/Doppler and 1 1/4 degree
off localizer course.
These displacements do not
apply to FM homing.
CRS Knob
Course Indicator
Course Pointer
The COURSE indicator and
course pointer operate in
conjunction with the course
selected (CRS) knob, and
allow the pilot to select any
VOR course. The course
pointer turns with the compass
card and will be
aligned with the with the
CONTROLS/
INDICATOR
FUNCTION
lubber line when the helicopter
heading is the same as
the selected course.
Range indicator Digital distance display in kilometers
(KM) to destination
set on GPS Control Display
Unit (CDU) (para. 3-3-36) or
doppler control FLY-TODEST
thumbwheel (para.
3-3-12).
HDG Knob Heading select (HDG) knob
operates in conjunction with
the heading bug. It allows
the pilot to select any one
heading. With CMD SEL (fig.
3-3-6) selected on the HSI
MODE SELECT panel, the
AFCS (chapter 2) will turn
the helicopter to and maintain
the selected heading.
HDG Flag The HDG flag is in view
when the signal from the
gyro magnetic compass is
unreliable or power to the indicator
is lost.
To-From Arrow To-from arrow indicates that
the helicopter is flying to or
away from the selected
VOR.
NAV Flag The NAV flag turns with the
compass card. The flag will
retract from view when a reliable
VOR, GPS/Doppler or
FM homing signal is being
applied to the instrument.
Aircraft Symbol Corresponds to longitudinal
axis of the helicopter; shows
helicopter position and
heading relative to the selected
course.
Glide Slope Pointer Displays glide slope position
relative to the helicopter or
FM homing signal strength.
When pointer is above center,
helicopter is below glide
slope, conversely when
pointer is below center, helicopter
is above glide slope.
Increasing homing signal
strength is shown by pointer
rising. decreasing signal
strength is shown by pointer
falling.
Glide Slope (GS)
Warning Flag
Indicates loss of or an unreliable
glide slope or FM
homing signal.
TM 1-1520-240-10
3-3-15
Figure 3-3-6. Horizontal Situation Indicator and Mode Select Panel
TM 1-1520-240-10
3-3-16
3-3-35. Horizontal Situation Indicator Mode Select.
(fig. 3-3-6)
The HSI MODE SELECT panel is on each pilots instrument
panel below HSI. The panel allows the pilot to select
the navigation mode to be displayed on the HSI,
command AFCS heading select feature, and visually indicates
marker beacon passage. The panel is divided
into three sections labeled CRS, BRG, and MKR BCN.
a. The CRS (course) section consists of four pushbutton
selector switches labeled VOR SEL, GPS/DOP
SEL, FM SEL, and CMD SEL. Pressing VOR SEL, GPS/
DOP SEL, or FM SEL causes the output of the selected
navigation set to be electrically connected to the course
deviation indicator on the corresponding HSI and lights
SEL legend in the switch. These switches are electrically
interlocked so only one set may be selected at a time.
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