Flight Guidance Control System; Flight Director - BOMBARDIER LEARJET 40 Pilot's Manual

Pilot's Manual

FLIGHT GUIDANCE CONTROL SYSTEM

The Primus 1000 system includes an autopilot, yaw damper and dual
synchronized flight directors. These are all co-located in two IC-600 dis-
play flight guidance computers located in the nose avionics bay. Each
IC-600 houses a flight director; however, only the copilot IC-600 is con-
nected to the pitch, roll and yaw servos for the autopilot/yaw damper
and rudder boost functions. A flight guidance controller, located in the
center of the glareshield, provides the means of engaging the autopi-
lot/yaw damper and controlling both Flight Director (FD) systems. It
also contains a transfer (XFR) switch that allows the crew to select ei-
ther the left or right flight director as master and for autopilot coupling.
The autopilot is a single channel with a fail passive design. The monitor
system provides for automatic disconnect in the event of a malfunction
in autopilot, yaw damper, or rudder boost. All automatic disconnects,
which result from monitor trips, will be stored in a non-volatile memo-
ry for later recall by technicians.

FLIGHT DIRECTOR

The flight director system, utilizing two separate IC-600 computers,
provides dual flight director computations, either of which can be cou-
pled to the autopilot. Only one flight director can be coupled to the au-
topilot at a time. In this case the coupled flight director is classified as
the master flight director, and the other flight director is classified as the
slave flight director. The flight director can couple to Short Range Nav-
igation (SRN) units (e.g. VOR, ILS), dependent upon which SRN is be-
ing displayed as a NAV data source on the Primary Flight Display
(PFD). The flight director will use the displayed SRN data on the asso-
ciated PFD for command-bar control computations. The flight director
can be coupled to optional Long-Range Navigation (LRN) units (e.g.
flight management system) if it is installed and selected as the NAV
data source and displayed on the associated PFD. The flight director
utilizes the lateral and/or vertical steering commands from the LRN in
the command control computations. Each flight director uses the dis-
played on-side Air Data Computer (ADC) data for all vertical modes
and gain programing. The flight director modes are synchronized in a
manner that allows selection of the modes to be accomplished by the
single set of FD mode select buttons on the Flight Guidance Controller
(FGC), see Figure 5-18. The FD mode select buttons on the FGC panel
are momentary action, and each has a vertical green bar that illumi-
nates whenever the mode is selected.
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PM-132A