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to the GPS. The position differential (POS DIFF) is shown in direction and magnitude
from the FMS position.
To alternately enable or disable use of a specific GPS sensor, push the left side lineselect
key of that sensor. Enabled sensors show in large green font, and disabled
sensors show in small white font.
The DEST and ETA entries are those of the active flight plan. You can manually enter
changes to see if RAIM is available for other destinations and/or arrival times.
Satellite Deselect
Individual satellites can be deselected from use by entering the identifier for the
satellite in the FMS. This function would be used if the satellite is NOTAMed under
test. When deselected, the FMS ignores the data from the satellite. Deselected
satellites are not included in the predicted RAIM computations.
FMS GPS Control Page
Figure 17-65
P604_17_090
MSG EXEC
POS BRT
TITLE LINE 1/3
>
>
>
>
GPS 1 <ENABLED>
GPS 2 <ENABLED>
114.85
18 21 5 13
CYUL
R
R
E
ETA
R1
COM 1
RCL 1
NAV 1
SAT DESELECT
DEST
L
FMS1 GPS CONTROL 1/5
[ ]
<INDEX
ATC 1
016° / 0.0
114.85
AUTO/MAN
23:59
POS DIFF
RCL 2
NAV 2
NAV 2
1441
ATC 2
>
AVAIL
PRED RAIM
016° / 0.0
NAVIGATION SYSTEMS
For Training Purposes Only
May 03
17-95
P I LOT T R A I N I N G GU I D E
Flight Management System (FMS)
Description
A dual flight management system (FMS) provides integrated cockpit and flight
management functions. Each flight management system (FMS 1 and FMS 2) is
composed of a Control Display Unit (CDU) in the cockpit and a Flight Management
Computer (FMC) in the underfloor avionics equipment bay. A single Data Base Unit
(DBU) allows data to be uploaded or downloaded to all of the FMCs. A third flight
management system (FMS 3) may be installed as a customer option.
The FMS cockpit management functions include:
• Navigation sensor control
• Radio tuning
• Multifunction display (MFD) control menus
• Navigation database management
• Control and management of the data loader
• Management of the data interface with external systems (AFIS)
Flight management functions include:
• Continuous calculation of the integrated navigation solution
• Flight plan inputs by the crew
• Lateral flight plan point-to-point navigation
• Vertical navigation
• Performance calculation
• Lateral/vertical steering commands to the flight control system
The third FMS, if installed, is defined as a “hot spare” and is fully functional when
selected.
For a comprehensive description of FMS functions and operation, refer to the “Collins
FMS-6000 for the Challenger 604” Pilot’s Guide.
NAVIGATION SYSTEMS
17-96 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Components and Operation
FMS Control Display Units (CDUs)
The FMS CDU is the cockpit interface of the Flight Management System. It allows the
flight crew to input, modify, and execute flight plans, as well as calculate aircraft
performance. It also acts as a radio tuning interface through a dedicated TUNE page,
and is the primary means of control for most navigation sensors. The CDU controls
certain information displays on the MFDs, and advises the flight crew of FMS system
status through a variety of message formats.
Power Supplies
• The No. 1 (left) CDU is powered by DC Bus 1
• The No. 2 (right) CDU is powered by DC Bus 2
• The No. 3 CDU is powered by the DC Essential Bus
In the event of loss of normal electrical power, the No. 1 CDU will be powered by the
BATT BUS when the ADG deploys.
Scratchpad and Line Select Keys
The FMS CDU is arranged so that all flight crew inputs are conducted through a
“scratchpad” which allows easy data input and retrieval. An alphanumeric keypad
permits entry of all relevant data to the scratchpad, and line-select keys are used to
insert the data in the appropriate area of the display page. Most information contained
on the display page can similarly be “line-selected” and is then transferred to the
scratchpad for reference or 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
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