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The HSI interfaces with the (HARS), the (ADF), and the
doppler navigation set. The instrument displays consist
of a fixed aircraft symbol, a compass card, two bearingto-
station pointers with back-course markers, a course
bar, a (KM) indicator, a (HDG) knob and marker, a
course set (CRS) knob, a COURSE digital readout, a tofrom
arrow, a NAV flag, and a compass HDG flag.
Operating power for the HSI is taken from the 115 vac
No. 1 essential bus through a circuit breaker marked HSI
on the pilot center circuit breaker panel. Controls and
indicators for the horizontal situation indicator are
described in table 3-22.16.
Figure 3-26.25. Horizontal Situation Indicator
(Typical)
3-64.26 Change 3
25
TM 1-1520-238-10
Table 3-22.16. HSI Controls and Indicators
Control/Indicator Function
Compass Card The compass card is a 360-degree scale that turns to display heading data obtained from the
HARS. The aircraft headings are read at the upper lubber line.
Bearing pointer The pointer operates in conjunction with the Doppler. It indicates relative bearing to the active
No.1 FLY-TO-location. The No. 1 bearing pointer "parks" at the 3 o’clock position when the Doppler
"bearing-to-destination" signal is invalid.
Bearing pointer This pointer operates in conjunction with the ADF receiver. The pointer is read against
No. 2 the compass card and indicates the magnetic bearing to the ADF station (nondirectional beacon).
Course deviation This bar indicates the lateral deviation from the desired navigation course. When the
bar helicopter is flying the desired navigation course, the course bar will be aligned with the course
set pointer and will be centered on the fixed aircraft symbol.
CRS knob (CRS) knob and the course set counter operate in conjunction with the course pointer and allow
the pilot to select any of 360 courses. Once set, the course pointer will turn with the compass card
and will be centered on the upper lubber line when the helicopter is flying the selected course,
providing there is no wind to blow the helicopter off course.
KM indicator The digital distance display in (KM) to the FLY-TO-location.
HDG knob (HDG) knob operates in conjunction with the heading select marker and allows the pilot to select
any one of 360 headings. Seven full turns of the knob produce a 360-degrees turn of the marker.
To-from arrow Works with VOR. Not applicable.
NAV flag The NAV flag, on the HSI course carriage, turns with the compass card. The flag retracts from
view when a reliable course deviation signal is available from the doppler.
HDG flag The HDG flag retracts when a reliable heading signal is available from the HARS.
During HARS alignment, retraction of the heading flag indicates that HARS is aligned (ready-tofly).
Distance shutter The distance shutter (upper left corner) retracts when the ’’the distance-to-destination" signal from
the Doppler is valid.
Change 3 3-65
TM 1-1520-238-10
Table 3-22. IP-1652G CDU Control and Display Functions - continued
Control/Display Function
FDLS
DATA
SPC
ENT
CLR
Access to Aircraft Fault Detection and Location System functions.
Access to Data Menu Top Level page.
Used only for entry of coordinate ID or FDLS/BST operations.
Not Used.
If pressed in response to an ERROR prompt in the scratchpad, will clear the error
prompt and position the cursor at the first detected data entry error. If pressed a second
time, will clear the entire scratchpad. If no ERROR prompt,will clear the entire
scratchpad.
PGM
IDNT
WPN
FPLN
STR
Access to Program Top Level page.
Not Used.
Access to Weapon Control Top Level page.
Access to Waypoint LIST page.
Stores PPOS in next waypoint store location (31-40), overwriting existing data.
placed to NORM. This method is not dependent
upon GPS availability, although GPS
availability does improve INU alignment time
and heading accuracy. This is the most often
used startup method.
NOTE
Do not attempt airborne or sea start with
HARS mode switch in NORM. HARS will
assume the aircraft is stationary with
switch in this position.
Figure 3-25. NAV Top Level Page (UTM
Format)
b. Three distinct techniques are used for navigation
mode startup under varying conditions. These are
Stationary, Airborne (with/without GPS) and Moving
2. Automatic Airborne Start (with GPS). This
method assumes an aircraft power interrupt
or a desired in-flight navigation restart while
the aircraft is airborne. This method can be
accomplished in either LAND or WATER
Platform (Sea, with/without GPS) alignments.
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