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the fault corrects itself, the light resets automatically.
9. SYSTEM CONTROLS
A. Flight Director Mode Selector (Figure 12)
The flight director mode selector provides all mode selection (except
go-around and touch control steering) for the flight director. Mode
annunciation is provided on both the mode selector and AOI.
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OPERATING MANUAL
Heading Select Mode
The heading select mode is selected by pressing the HD6 switch/light
on the flight director mode selector. The HDG annunciator on the ADI
comes on. In the HDG mode, the flight director computer provides
inputs to the roll steering pointer to corranand a turn to the heading
indicated by the heading bug on the HSI. The heading select signal is
gain programmed as a function of airspeed. When the HDG mode is
selected it overrides the NAV, BC and APR modes. If there is a loss
of valid data from the vertical gyro or compass, the ADI command cue
goes out of view.
Navigation Mode
The navigation mode, NAV, represents a family of modes for various
systems including VOR, localizer and RNAV.
VOR Mode
The VOR mode is selected by pressing the NAV switch/light on the
flight director mode selector with the VHF navigation receiver tuned
to a VOR frequency. When outside the lateral bracket sensor trip
point, the ADI command cue receives a heading select command as
described above and the HDG mode annunciators on the mode selector and
ADI come on along with the NAV ARM annunciator on the mode selector.
Upon reaching the lateral bracket sensor trip point, the system
automatically switches to the VOR mode. The HDG and NAV ARM
annunciators go off and the NAV CAP annunciator on the mode selector
and NAV annunciator on the ADI come on.
At capture, a command is generated to capture and track the VOR beam.
VOR deviation is gain programmed as a function of distance from the
station. This programming corrects for beam convergence thus
optimizing the gain through the useful VOR range. The DME must be
tuned to the same VOR station as the selected VHF navigation
receiver. The course error signal is gain programmed as a function of
airspeed. Crosswind washout is included, which maintains the aircraft
on beam centre in the presence of crosswind.
The intercept angle and DME the range signal are used in determining
the lateral bracket sensor trip point to ensure smooth and comfortable
performance during bracketing.
When passing over the station, an overstation sensor detects station
passage, removing the VOR deviation signal from the command until it
is no longer erratic. While over the station, course changes are made
by selecting a new course on the HSI.
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OPERATING MANUAL
PITCH LIGHT
Comes on when a difference exists between
the dual pitch channels.
ROLL LIGHT
Comes on when a difference exists between
the dual roll channels.
LOC LIGHT
Comes on when a difference exists between
the two localizer signals.
TEST RESET SWITCH/LIGHT
Tests the internal electronics and annuniciator
lights.
Resets any prior disabled channel. GS LIGHT
Comes on when a difference exists between
the two glide slope signals.
HDG LIGHT
Comes on when a difference exists between
the two heading signals.
Comes on when the internal power supply
voltage drops below a predetermined level.
WARN DISABLE SWITCH/LIGHT
Amber light comes on when one or more
drive signals from the above six functions produce
a master warning drive signal. Pressing
the button disables all monitoring functions
except the voltage monitor.
Instrument Comparator
Figure 11
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OPERATING MANUAL
NAVIGATION
MODE
HEADING
SELECTMODE
BACK COURSE
MODE
LOCALIZER
APPROACH
MODE
JHDG |NAV APR BC| VORAPB^BY
VOR APPROACH
MODE
ON iARM CAP ARM CAP
ALTITUDE HOLD
MODE
ARM CAP
) vs
ON
ARM CAP
IAS
ON
SBY
|1 J
MACHC
ON
D>
VERTICAL SPEED
HOLD MODE
INDICATED AIRSPEED
HOLD MODE
VERTICAL
NAVIGATION
MODE
MACH HOLD
MODE
Flight Director Mode Selector
Figure 12
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OPERATING MANUAL
If the VHF navigation receiver is not valid prior to the capture
point, the lateral beam sensor does not trip and the system remains in
　
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