BendixKing KAP 140 - Manual (Page 93)

KCS 55A Compass System
118 KAP 140 AUTOPILOT SYSTEM
Rev. 0
Jun/98
Under some conditions it is possi-
ble for the system to stop slaving
exactly 180 degrees from the cor-
rect heading. If this should occur,
move the “Slave” switch on the
KA 51B to the unslaved (free)
position. Rotate the compass card
±10 degrees from the incorrect
heading by using the manual rota-
tion switch and then return the
system to slaved operation. The
system will then slave to the cor-
rect heading.
4. For the free gyro operation, check
the magnetic compass to deter-
mine the correct magnetic head-
ing. Then use the manual slave
switch to align the system with the
earth’s magnetic field. Periodic
checks with the standby compass
are recommended to check and
correct for gyro precession.
5. Until a usable navigation signal is
being received by the NAV sys-
tem, a red flag labeled “NAV” will
be visible in the upper left quad-
rant of the KI 525A Indicator. In
operation, this warning flag should
be visible whenever an inade-
quate navigation signal is being
received.
6. For normal navigation to or from a
VOR or VORTAC, set the NAV
receiver to the desired VOR or
VORTAC frequency and the red
navigation flag (NAV) should dis-
appear from view if a usable sig-
nal is being received.
7. Rotate the course select knob to
position the course pointer to the
desired VOR course.
8. The VOR deviation bar represents
the selected course, and the rela-
tionship of this bar to the symbolic
aircraft in the center of the instru-
ment visually presents the actual
relationship of the selected course
to your aircraft heading. (In other
words, if the symbolic aircraft on
the display indicates approaching
the deviation bar at 45 degrees,
that is the angle at which your air-
craft is actually approaching the
selected course.
9. To prepare for an ILS approach,
tune the NAV receiver to the
desired Localizer frequency. If a
usable Localizer signal is being
received, the NAV warning flag
will disappear.
10. For a front or back course
approach, rotate the course select
knob to set the course pointer on
the inbound Localizer course. As
with normal navigation (#6 above),
the LOC deviation bar represents
the desired course. The relation-
ship between this bar and the
symbolic aircraft gives a true pic-
ture of your aircraft’s position with
respect to the Localizer course.
Always setting the course pointer
to the inbound Localizer course
provides the correct deviation bar
sensing whether flying a front or
back course approach.
11. The glideslope deviation pointers
should become visible on both
sides of the display when a usable
glideslope signal is received. If
they do not come into view, a
usable glideslope signal is not
being received.