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rotates with the rotating heading dial to provide a continuous readout
of course error to the flight director computer.
(6) Course Display
A digital readout in degrees of the course selected by the course knob.
(7) Course Deviation Bar
Represents the centreline of the selected VOR, RNAV, or localizer
course. The aircraft symbol shows aircraft position in relation to
the selected course.
(8) Course Deviation Dots
In VOR operation, each dot represents a 5-degree deviation from
centreline. In ILS operation, each dot represents a deviation of
1 degree from centreline. In RNAV operation, the sensitivity of the
deviation bar is a function of the type of RNAV computer used.
Therefore, the distance represented by each dot is determined by the
particular RNAV computer installed.
(9) Vertical Deviation Pointer
The vertical deviation pointer displays VNAV or GS deviation. The
pointer is in view only when the VHF navigation receiver is tuned to a
localizer frequency or VNAV mode is selected. Aircraft is below glide
path if pointer is displaced upward. In the VNAV mode, the deviation
display represents a vertical path error. The sensitivity of the
display is a function of the type of VNAV computer installed.
(10) Vertical Warning Flag
The VERT flag is in view when the vertical deviation valid signal is
lost.
(11) Distance Display
The distance display is a four-digit display which indicates slant
range distance in nautical miles to the selected DME station. The
display goes blank when the input is off or invalid, and all digits
show dashes.
SECTION 4
Page 18
Oct 03/83
OPERATING MANUAL
(12) NAV Mode Annunciator
A four-position rotary disc which displays through the opening in the
mask the following data:
- When white arrow is toward course pointer, aircraft is flying
(to) selected VOR station
- When white arrow is toward tail of course pointer, aircraft is
flying (from) the VOR station
- Red and yellow stripes appearing in both windows warn pilot that
radio data are unusable
- Fourth position is blank indicating that NAV receiver is tuned to
a valid localizer frequency.
(13) RNAV Mode Annunciator
A display in the upper right of the indicator face provides the
following data:
- When the HSI is displaying RNAV data, the display reads RN
- When the HSI is displaying normal radio data, the display is blank
(14) Alert Annunciator
The display lights alert the pilot that the aircraft is approaching a
selected waypoint.
(15) Vertical Mode Annunciator
Indicates whether vertical deviation information is from VNAV or
glideslope.
(16) Bearing Pointer
This pointer indicates relative bearing to the selected radio station.
(17) Bearing Select Pushbuttons and Annunciators
Provide annunciated selection of ADF or NAV bearing information to be
presented on the bearing pointer. On power-up, NAV is annunciated.
(18) True Heading Annunciator
If INS is available and is selected as a navigation source, the
heading data to the HSI is INS true heading and is annuciated by the
TRU annunciator. Without INS, the TRU annunciator is off and heading
data is from the magnetic compass.
SECTION 4
Page 19
Oct 03/83
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OPERATING MANUAL
(19) Navigation Warning Flag
The NAV flag is in view when the navigation valid signal is lost.
(20) Compass Sync Annunciator
The compass sync annunciator consists of the symbol . or + (dot or
cross) displayed in a window. When the compass system is in the
slaved mode and synchronized, the display slowly oscillates between .
and + to indicate that the rotating heading dial is synchronized with
the gyro-stabilized magnetic heading.
(21) Navigation Source Annunciators
The RN,VLF, INS and VN annunciators indicate the source of navigation
displayed by the HSI. The annunciators are all off for V0R/L0C and
glideslope.
(22) To-From Annunciator
The to-from annunciator is displayed by a white arrow pointing toward
the course select pointer when the aircraft is flying (to) a selected
VOR station and a white arrow pointing toward the tail of the course
select pointer when the aircraft is flying (from) the VOR station.
Instrument Remote Controller (Figure 5)
The pedestal mounted instrument remote controller is used to select the
desired heading and course as displayed on pilot's and copilot's HSI.
Pilot's Altimeter (Figure 6)
The pilot's altimeter provides a servo-driven drum/pointer display of
barometrically corrected pressure altitude. The barometric pressure is set
manually with the BARO knob and displayed in units of inches of mercury and
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