User manual

Page 56

Aircraft Operation Manual

Piper Cheyenne I, IA, II, IIXL

For ight simulation use only

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 alter-

nate 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 whether control surfaces are operated manually or by the Autopilot. The

Yaw Damper engage status is annunciated on the KC291 Yaw Mode Controller.

NAVIGATION (NAV ARM and NAV CPLD) Mode

The NAV mode provides visual bank commands on the Flight Command Indicator

and deviation guidance on the HSI to intercept and track a VOR course or an GPS

course.

Operation of the NAV mode requires the pilot to:

1. Tune the frequency of the selected VOR (or VORTAC) station.

2. Set the HSI course pointer on the desired course.

3. Establish angle of intercept by setting the heading „bug” and activate

„HDG” mode.

4. Depress the NAV button on the Mode Controller

When the „NAV” button on the Mode Controller is depressed, „NAV ARM” will

be lighted on the Annunciator Panel and the automatic capture circuit is armed.

Heading select, if operating, is retained until capture occurs.

The VOR „course-capture’’ point is variable to prevent overshoot and depends on

angle of intercept and the rate the course deviation is changing. Upon capture, a

bank command will be displayed on the FCI; the HDG, if on, will be cancelled and

„NAV CPLD” will be lighted on the Annunciator Panel.

The pilot can manually bank the aircraft to satisfy the command display which

will call for a rollout to level ight when on course centerline to track the course.

Crosswind compensation is provided in the „track“ state.

If the NAV mode is selected with the aircraft level within ±4° of bank and within

three dots of course deviation, NAV ARM will be bypassed and NAV CPLD will

engage directly.