Pitch Hold Mode Operation, Ap Not Engaged - Honeywell PRIMUS 1000 Pilot's Manual

OUTER
MARKER
4.0--7.0 MILES
ILS Approach Mode Tracking, Profile View
PITCH HOLD MODE
The pitch hold mode is the basic autopilot and flight director vertical
mode. This mode is best described by comparing the operation of the
pitch hold mode with the AP engaged and with the AP not engaged.
Pitch Hold Mode Operation, AP Engaged
Pitch hold mode with AP engaged operates as follows:
If no vertical FD modes are active, the AP holds the pitch attitude
D
that existed at the time the AP was engaged. The vertical flight
director mode is annunciated as PIT.
The pitch reference can be changed by pushing and holding the
D
TCS (touch control steering) button on the pilot' s or copilot' s control
wheel and manually flying the aircraft to a new pitch attitude
reference. When the TCS button is released, this new reference is
held by the autopilot. The pitch reference can also be changed by
moving the PITCH wheel on the autopilot controller.

Pitch Hold Mode Operation, AP Not Engaged

Pitch hold mode with AP not engaged operates as follows:
Selecting an FD lateral mode with no active FD vertical mode
D
displays the command bar. The command represents the aircraft
pitch attitude at the moment the FD lateral mode was selected. The
vertical flight director mode is annunciated as PIT.
The pitch hold mode is cancelled by manual or automatic selection
D
of any FD vertical mode.
A28--1146--112--00
PRIMUSr1000 Integrated Avionics System
RADIO ALTITUDE
BETWEEN 1200
AND 1500 FEET
MIDDLE
MARKER
3500 FEET
Figure 8--20
RADIO ALTITUDE
BETWEEN 200
AND 300 FEET
RUNWAY
AD--50992@
Modes of Operation
8-25