Embraer EMB145, Operation Manual

Page: 2623 / 2662

AIRPLANE
OPERATIONS
MANUAL
AUTOPILOT
REVISION 36
2-19-10
Page
1
Code
01
A
O
M-145/1
114
FLIGHT DIRECTOR MODES
Flight Director mode selection is accomplished through the Flight
Guidance Controller. Each mode selector button is illuminated for the
armed and captured mode. Also, each active mode is annunciated on
the PFD display and this annunciation makes the distinction between
armed and captured modes. The various modes may be divided into
two categories: Lateral and Vertical modes.
LATERAL MODES
Lateral modes are those modes related to heading or roll control. They
normally provide commands based on navigation sources.
HEADING HOLD MODE
Heading Hold mode is the default Flight Director mode when no other
lateral mode is selected. The Heading Hold mode provides roll
commands to maintain the heading at the moment of mode
engagement. Once this mode is selected, the heading reference is
established one second after the system detects a bank angle of less
than 6º. A bank angle command of 0° is used (wings level) until the
heading reference is established.
The ROL green label is displayed on the PFD to indicate the mode is
engaged. Only the pilot’s side primary heading is used by this mode. If
this data is invalid, the Wings Level submode is used.
The Heading Hold mode is divided into Roll Hold submode, Turn Knob
submode and Wings Level submode.
ROLL HOLD SUBMODE
The Roll Hold submode is entered from Heading Hold mode, with the
autopilot engaged, by using the Touch Control Steering Button (TCS)
to manually fly the airplane to a bank angle greater than 6
q
. The
system maintains the bank angle at the time the TCS button is
released. Roll Hold submode may be canceled by either manually
flying the airplane to less than 6° with the TCS button, by moving the
Turn Control Knob out of detent or by selecting another lateral mode.
This mode is annunciated on the PFD by the ROL green label.