User manual
Page 54
Aircraft Operation Manual
Piper Cheyenne I, IA, II, IIXL
For ight simulation use only
cel modes. For example, if in NAV CPLD mode, selection of Heading will automa-
tically cancel NAV.
THE BASIC MODE OF SYSTEM OPERATION
The system will be in the Basic Attitude Reference or „Gyro” mode with engi-
nes running and aircraft „power on,” but no modes selected (Annunciator Panel
blank). This provides indication of aircraft heading on the Horizontal Situation
Indicator, and roll and pitch attitude on the Flight Command indicator. The FCI
Command V-bar is biased out of view.
FLIGHT DIRECTOR Mode (FD)
The Flight Director mode is activated by depressing the „FD” button on the Mode
Controller. The FCI Command V-bar will appear and provide the pilot with stee-
ring commands to maintain wings level and the pitch attitude that existed at the
time of Flight Director engagement.
If pitch or roll attitude are changed, recycling the FD button will synchronize the
Command V-bar to the new situation.
If a change only in the commanded pitch attitude is desired, the Control Wheel
Steering (CWS) button installed on the pilot’s control wheel allows the pilot to
synchronize the Command V-bar (in the FD mode with Autopilot disengaged)
without removing his hand from the control wheel.
The Flight Director can also be activated by direct selection of any specic mode,
which will activate the Command V-bar. Such selection will will cause the annun-
ciation of both the FD and the appropriate mode.
The Vertical Trim switch on the Mode Controller may also be used to adjust the
selected pitch attitude up or down at approx. 1 degree/second.
Special note: The FD mode must be activated before the Autopilot can be engaged.
AUTOPILOT Engagement
The AUTOPILOT is engaged by moving the AP toggle switch on the Mode Con-
troller to the ON position. Note that the AP and the YAW DAMP (YD) switches
are wired so that the YAW DAMP mode is automatically engaged with the AP
switch. The Autopilot, together with the Yaw Damper, provides three-axis sta-
bilization, automatic turn coordination and automatic elevator trim as well as
automatic response to all selected Flight Director commands.