HEADING SELECT/PRESELECT
Mode
(HDG SEL)
Select a desired heading by positioning
the heading "bug" on the PNI. This is done
with the HDG knob on the PNI.
Depress the HDG button on the Mode
Controller
to
activate the HDG
SEL
mode.
HDG
SEL"
will light on the Annunciator Panel
and a computed, visually displayed bank
command is shown on the FCI. Following this
bank command, the aircraft will bank and roll
out
on the desired preselected heading.
The Command V-bar on the FCI will de-
flect in the direction
of
the shortest turn
to
satisfy the commanded turn
to
the pre-
selected heading. The aircraft may be man-
ually banked
to
realign the V-bar and satisfy
the command or, if the Autopilot is engaged,
the aircraft will automatically bank, turn
to,
roll
out
and hold the preselected heading. As
the aircraft approaches the selected head-
ing the V-bar will command a rollout
to
wings
level.
With the HDG
SEL
mode in operation,
subsequent changes made in the heading
bug" position on the PNI will immediately
cause the V-bar on the FCI
to
call for a turn to
the new heading.
The HDG
SEL
mode is cancelled when
NAV or APPR coupling occurs, or whenever
the FD or HDG mode buttons are depressed.
CAUTION:
An invalid heading source (com-
pass flag in view) will automatically disen-
gage the autopilot. The autopilot may then be
re-engaged, however, only the vertical
modes will be useable.
YAW DAMP Mode
The KC 291 Yaw Mode Controller is in-
stalled beside the KC 290 Mode Controller
and the yaw axis is wired
so
that it automati-
cally engages when the Autopilot
IS
en-
gaged Disengagement
of
the Yaw Damper
is accomplished by using the alternate ac-
tion switch (pushbutton) on the KC 291 The
Yaw Damper may be engaged alone with
or
without any Flight Director mode
It
usually
provides a more stable aircraft whether
control surfaces are operated manually or by
the Autopilot The Yaw Damper engage
status is annunciated on the KC 291 Yaw
Mode Controller
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