moved and the flight director resumes the pre-
vious vertical mode reference.
On aircraft 45-170 and subsequent and on ear-
lier aircraft modified by SB 45-22-4, the over-
speed protection mode (MAX SPD) also
functions when the AP/FD is in the pitch mode
(PIT).
The FMS provides overspeed protection, with
the same PFD annunciation, when in the
VNAV mode. FMS overspeed protection is
provided for VMO/MMO as well as VFE (flap
overspeed).
FLIGHT MANAGEMENT
SYSTEM (FMS)
GENERAL
The UNS-1C is a navigation computer, a
twelve channel GPS receiver and control/dis-
play function all combined into one unit
(Figure 16-50). In this manual, the FMS unit
will be referred to as the CDU (control display
unit). The CDU contains a color, flat panel dis-
play, a full alpha-graphic keyboard, ten line
select keys (LSK) and dedicated function keys.
The UNS-1C contains a data base with full pro-
cedures for SIDs, STARS and instrument ap-
proaches, along with airways and
plain-language references for navaid and air-
port identifiers.
THEORY OF OPERATION
The FMS provides for great circle navigation
along a predefined flightplan. The navigation
computer receives navigation sensor infor-
mation from the VOR, DME and GPS re-
ceivers. From the sensor information, the FMS
computes a single “best” position. The “best”
position is used as the basis for the FMS com-
putations, such as course, bearing, desired
track, distance, estimated time enroute, esti-
mate time of arrival, wind speed and direction,
ground speed, etc.
The FMS interfaces with the IC-600s for a
transfer of information to the lateral and ver-
tical steering commands.
FMS FUNCTIONS
FLP (Flight Plan)
Before using the FMS for navigation, an active
flight plan must be defined within the FMS. The
operator may select a previously stored route or
create a new one to load as the active flight plan.
A route or the active flight plan can be created
on the FMS. Once the departure airport is
identified, the UNS-1C will successively pre-
sent tailored lists from which the current run-
way, SID and transition can be selected. Also,
both low and high altitude airways can be ac-
cessed for route or flight plan creation using
the LIST function. Routes or the flight plan
may also be constructed waypoint by way-
point, or by combining stored route segments.
When enroute and nearing destination, a pro-
LEARJET 45 PILOT TRAINING MANUAL
16-91
FOR TRAINING PURPOSES ONLY
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