Flight Level Change (Flc) Mode - Honeywell PRIMUS 1000 Pilot's Manual

R
PRIMUS 1000 Integrated Avionics System

Flight Level Change (FLC) Mode

The flight level change mode is engaged by pushing the FLC button on
the mode selector. The IAS/Mach reference is synchronized to the
IAS/Mach being flown when the mode is engaged. When a new
reference is manually selected using the PITCH wheel on the autopilot
controller, the system automatically flies the new reference.
Switching from IAS to Mach (or Mach to IAS) does not move the
reference, it only changes the units used on the digital readout on the
PFD. The aircraft does not change any attitude when units of measure
are switched.
The flight level change mode is an airspeed mode. It differs from a
standard IAS or Mach mode in the following ways:
D
Although flight level change mode tracks the reference airspeed in
the long term, short–term emphasis is on vertical speed. This
minimizes vertical speed excursions due to disturbances or large
airspeed changes.
D
The flight level change mode is set up to change altitudes at the
selected airspeed, from present altitude to preselected altitude. The
flight level change mode tries to prevent flying away from the
preselected altitude target. For example, if the throttle is retarded
during a climb toward a preselected altitude, the system tries to
maintain a positive vertical speed, resulting in deceleration rather
than descent, even if vertical speed reaches zero.
Modes of Operation
6-30
A28–1146–134
REV 1 Jan/03