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modification.
Execute Key
Most entries made into the flight plan or performance calculations are considered modifications
to the active flight plan, and must be executed using the EXEC function key before they
become active components of the flight plan. This permits the flight crew to cross-check any
modifications prior to committing them to the active flight plan.
Function Keys
Dedicated function keys allow direct access to certain flight management or cockpit
management features of the FMS.
Certain CDU displays have multiple pages as indicated in the top right corner of the display
screen. Access to the other pages is achieved using the PREV and NEXT function key.
MFD Function Keys
Three function keys relate specifically to MFD displays. The MFD DATA and MFD MENU keys
control the type of information available on the MFD. The MFD ADV key allows access to
multiple pages of MFD information. When the PLAN MAP format of the MFD is in use, the
MFD ADV key allows the flight crew to view the waypoints of their flight plan.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−78
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CL−604 Operating Manual
PSP 604−6
FLIGHT MANAGEMENT SYSTEM (FMS) (CONT'D)
FMS Control Display Unit (CDU)
Figure 17−10−67
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−79
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PSP 604−6
FLIGHT MANAGEMENT SYSTEM (FMS) (CONT'D)
Flight Management Computers (FMCs)
The flight management computers are installed in the integrated avionics processing system
(IAPS). The FMCs receive flight crew inputs from the CDU, and perform all the flight
management and cockpit management functions. Each FMC contains a navigation database,
which it uses to execute the active flight plan.
Integrated Navigation Solution
The integrated navigation solution is the FMS-calculated position of the aircraft, in latitude and
longitude. The FMCs receive data from all aircraft navigation sensors, and continuously
calculate the integrated navigation solution. GPS is normally the highest priority sensor used in
this position calculation, but a combination of DME/DME, VOR/DME, and IRS information is
also used according to predetermined blending algorithms. The FMC rejects sensor data that
is not valid, and advises the flight crew of position determination errors through the CDU
message system.
Flight Plan Tracking
By comparing the integrated navigation solution to the navigation database and the active flight
plan, the FMC calculates and displays the aircraft’s position relative to the flight plan routing,
and issues steering commands to the flight control computers to track the lateral and vertical
components of the active flight plan.
NAVIGATION SYSTEMS
Description
Vol. 2 17−10−80
REV 76, Jul 17/09
CL−604 Operating Manual
PSP 604−6
FLIGHT MANAGEMENT SYSTEM (FMS) (CONT'D)
Data Base Unit (DBU)
The data base unit (DBU) is a panel-mounting data loader with a disk drive, that is used with the
FMS system and the maintenance diagnostic computer. The FMS system uses the DBU to load
database updates from diskettes into the FMS computers. The integrated avionics processing
system (IAPS) maintenance diagnostic computer uses the DBU to upload maintenance tables
from diskette, or download maintenance data files to diskette. High-density and double-density
3-1/2 inch diskettes are acceptable. The unit has a “drive in-use” indicator and a disk eject
button.
The navigation database is loaded into each FMC individually through the DBU. Flight plans and
waypoints may also be loaded or stored on disk through the DBU.
Data Base Unit
Figure 17−10−68
NAVIGATION SYSTEMS
Description
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CL−604 Operating Manual
PSP 604−6
FLIGHT MANAGEMENT SYSTEM (FMS) (CONT'D)
Synchronized/Independent Operation
Dual-FMS system have provisions for operation in synchronized (SYNC) or independent
(INDEP) modes. By default, dual-FMS airplanes power up in SYNC, and triple-FMS airplanes
power up in INDEP mode.
In the triple-FMS configuration, the flight crew decides which two FMSs to synchronize. FMS 3
is selected using the FMS reversionary selector switch (see Figure 17−10−70). SYNC/INDEP
mode selections are made on the FMS CONTROL page of the CDU.
When two FMSs are synchronized, they share the following parameters:
• Flight plan edits
• Performance initialization
• Leg sequencing
• Active database selection
　
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