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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 keys.
NAVIGATION SYSTEMS
For Training Purposes Only
May 03
17-97
P I LOT T R A I N I N G GU I D E
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.
FMS Control Display Unit (CDU)
Figure 17-66
MSG EXEC
DIR LEGS
DEP
ARR FPLN IDX TUNE
MFD
DATA
MFD
MENU
MFD
ADV
PERF PREV NEXT
A
1 2 3 G
M
S
Y
B C
SP
D
DEL
E F
H
N
T
Z
I
O
U
J
P
V
K
Q
W
/
L
R
X
CLR
4
7
.
5
8
O
6
9
+/-
POS BRT
TITLE LINE 1/3
>
>
>
23MAY02
>
POS INIT>
WORLD
23MAY02 23JUN02
25APR02 22MAY02
12:11
SCID 832-4117-034
<INDEX
R
R
E
DATE
R
R
NAV DATA
ACTIVE DATA BASE
SEC DATA BASE
UTC
PROGRAM
L
STATUS 1/2
[ SCRATCHPAD LINE ]
MSG ANNUNCIATION EXEC
Line Select Keys Line Select Keys
Scratchpad Line
Message
Annunciation Line
Execute Key
MFD Function Keys
Message Key
FMS 3
FMS 1 FMS 2
P604_17_047
Function Keys
Alphanumeric Keys
NAVIGATION SYSTEMS
17-98 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Flight Management Computers (FMCs)
The flight management computers are installed in the Integrated Avionics Processor
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.
Data Base Unit (DBU)
The Data Base Unit (DBU) is a panel-mounted 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 Processor 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.
NAVIGATION SYSTEMS
For Training Purposes Only
May 03
17-99
P I LOT T R A I N I N G GU I D E
Data Base Unit
Figure 17-67
DBU
Used to revise FMS NAV data base upload /
download data from AFIS maintenance
diagnostic computer.
P604_17_046
NAVIGATION SYSTEMS
17-100 For Training Purposes Only
May 03
P I LOT T R A I N I N G GU I D E
Synchronized / Independent Operation
Dual-FMS systems have provision for operation in synchronized (SYNC) or
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