User manual

Piper PA-31T Cheyenne X
Aerosoft GmbH 2007
62 63
62 63
HEADING SELECT/PRESELECT Mode (HDG SEL)
Select a desired heading by positioning the heading „bug” on the HSI.
This is done with the HDG knob on the HSI. 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 deflect in the direction of the
shortest turn to satisfy the commanded turn to the preselected hea-
ding. The aircraft may be manually 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 heading the V-bar will com-
mand a rollout to wings level.
With the HDG SEL mode in operation, subsequent changes made in
the heading „bug” position on the HSI 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 (compass flag in view) will auto-
matically disengage the autopilot. The autopilot may then be re-engaged,
however, only the vertical modes will be useable.
YAW DAMP Mode
The KC291 Yaw Mode Controller is installed beside the KC290 Mode
Controller and the yaw axis is wired so that it automatically engages
when the Autopilot is engaged. Disengagement of the Yaw Damper is
accomplished by using the alternate action switch (pushbutton) on the
KC291. The Yaw Damper may be engaged alone with or without any
Flight Director mode. It usually provides a more stable aircraft whe-
ther control surfaces are operated manually or by the Autopilot. The
Yaw Damper engage status is annunciated on the KC291 Yaw Mode
Controller.