The
KMS
446
mode selector pro-
vides
control
and annunciation of the
KFC
400's
Flight Director modes. Illu-
mination of the annunciations is ad-
justed automatically by a photocell
located on the face of the unit.
Display
Features
Mode
Annunciations
1.
HDG
(heading select)
-
Illumin-
ates when heading select mode is
engaged by the heading pushbutton.
Flashing indicates
loss
of a sensor
required to hold selected
HDG
(e.9.
invalid magnetic heading, invalid
se-
lected heading) and continues until a
second push of the
HDG
pushbutton
to acknowledge automatic disengage-
ment of the mode.
2.
NAV
(capture and track selected
navigation sensor)
-
Illuminates
when
NAV
capture or
NAV
track
mode is engaged by the
NAV
push-
button and normally sequenced
through
NAV ARM.
Flashing indi-
cates loss of a sensor required to cap-
ture or track the selected nav (e.g.
invalid
NAV,
invalid selected course)
and continues until a second push of
the
NAV
pushbutton acknowledges
automatic disengagement of the
mode.
3.
NAV ARM
(preengage condition of
NAV)
-
Illuminates when
NAV
mode
is called for by the
NAV
pushbutton.
It
allows a compatible lateral mode to
be used to intercept the desired
course or track.
In the event of a sus-
tained
NAV
invalid,
NAV ARM
will dis-
engage leaving the current engaged
mode active and allowing later rearm-
ing
of
the
NAV
mode.
4.
APR
(capture and track selected
navigation sensor with approach
accuracy)
-
Illuminates when ap-
proach capture or approach track
mode is engaged by the
APR
push-
button and normally sequenced
through
APR ARM.
Flashing indi-
cates loss of a sensor required to cap-
ture or track the selected nav (e.g.
invalid
NAV,
invalid selected course)
and continues until a second push of
the
APR
pushbutton acknowledges
automatic disengagement of the
mode.
5.
APR ARM
(preengage condition
of
APR)
-
Illuminates when
APR
mode is called for by the
APR
push-
button.
It
allows a compatible lateral
mode to be used to intercept the de-
sired course. In the event of a sus-
tained
NAV
invalid,
APR ARM
will
dis-
engage leaving the current engaged
mode active and allowing rearming of
the
APR
mode later.
6.
FD (flight director
)
-
Illuminates
when FD or
AP
button is pushed or
any flight director mode is engaged.
7.
MACH
(Hold current
MACH
refer-
ence speed)
-
Illuminates when the
MACH
hold mode is engaged by the
MACH
pushbutton. Flashing indi-
cates
loss
of a sensor required to hold
current reference
MACH
airspeed
(e.g. invalid indicated airspeed) and
continues until a second push of the
MACH
pushbutton acknowledges
automatic disengagement of the
mode.
8.
VNAV
(fly selected vertical track
angle)
-
Illuminates when vertical
navigation mode is engaged by the
VNAV
pushbutton. Flashing indicates
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