System Safety
is
Assured
by
Integrity Monitors.
The KFC
200
monitors the validity of the
system sensors and the Flight Computer
to
alert the pilot when sensor information is
faulty and when the system cannot respond
correctly
to
command signals.
"Invalid" signals provide visual warning
by means of the flags and annunciators.
"Invalid" NAV signals are also routed
to
the
KFC
200
switching logic
to
"lock out" modes
which will not operate reliably.
Most failures in the slaved compass sys-
tem would be annunciated by a HDGflag and
the system would not allow setection of the
Heading mode.
The illustrations above show the KFC
200
Flight Director cockpit displays with all warn-
ing flags in view.
Flight Command Indicator warnings:
Flight Director (FD) Command V-bar will bias
out
of
view whenever the FD mode is not
selected, when FD internal power is inade-
quate and when gyro excitation information
is invalid.
The Pictorial Navigation Indicator
warnings: A HDG flag indicates that the com-
pass information is not reliable. A NAV flag
indicates
that
a valid NAV Signal is not being
received.
When an ILS channel is selected
on
the
NAV receiver and a valid Glideslope signal
is received, the Glideslope pointers will drop
into view. Glideslope coupling usually occurs
at Outer Marker, when the Glideslope is in-
rercepted and APPR CPLD.
If.
after
GS
coup
ling, the GS pointers disappear, the system
will flash the GSAnnunciator and revert from
GS back
to
Pitch Attitude Hold.
tf
the
GS
pointers return into view
.the
system will
revert back
to
GS couple$*fh-e NAV warning
flag indicates an invalid Localizer
but
has no
effect on Glideslope operation.
The Trim warning light in the lower
right corner of the Annunciator Panel will light
when an Autotrim failure occurs or when the
trim breaker is pulled
It
will also flash at least
four times when the TEST switch on the
Mode Controller is depressed.
I
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