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NDU display. When first pressed and held, the display
intensity increases until the brightest level is reached.
When pressed and held a second time, the display
intensity decreases until the dimmest level is reached.
TST Key
The test key is used to start a
test of all NDU annunciators,
cue lights and display.
SYSTEM SELECT FAULT
WS STS
POS
GS
1
M
2 T
BRT
3 DIM
TST
ENT 0 CLR
The System select keys are used
to select data for display from IRU1,
IRU2, or IRU3. The NDU displays
data from one IRU at a time. The
selected IRU’s cue light is
illuminated.
GX_16_012
P I LOT T R A I N I N G GU I D E
NAVIGATION
16-12 For Training Purposes Only
Sept 04
DATA SELECT KEYBOARD
The data select keyboard is used to select data for display. Each key contains a cue
light that indicates what type of data has been selected. When the WPT, LEG CHG,
POS, or HDG STS key is pressed, the operator can enter new data or modify the data
that the NDU is displaying. The data select keyboard consists of the following:
DISPLAYS
The NDU contains a data display and a FROM TO WPT display.
The NDU data display consists of two displays, a six-position and a seven-position
display, each having degree, decimal and minute indicators.
GX_16_013
SYSTEM SELECT FAULT
WPT
LEG
CHG
XTK
DTK
WD
WS
DIS
TIM
HDG
STS
POS
TK
GS
8 8
WPT Key
The waypoint key is used to
build and display a flight plan
consisting of one to nine
waypoints. When the key is
repeatedly pressed, the NDU
displays the successive flight
plan waypoints by number and
position.
LEG CHG Key
The leg change key is used to
define or modify the current flight
plan leg by displaying the FROM
and TO waypoint numbers. The
current leg must be defined before
navigation data can be defined and
displayed.
XTK DTK Key
The crosstrack/desired track
key is used to select and
display the cross track error
in nautical miles from the
current leg and the desired
track of that leg.
DIS TIM Key
The distance/time key is used to
select and display the distance
and time to the TO waypoint
based upon present position and
current groundspeed.
TK GS Key
The track/groundspeed key is
used to select and display the
current track and groundspeed
POS Key
The position key is used to
initialize and display the present
position of the airplane.
WD STS Key
The wind direction/wind speed key
is used to select and display the
current wind direction and wind
speed.
HDG STS Key
The heading/status key is used to
display the current airplane
heading. When the IRU is in align
mode, the NDU displays
alignment status (time remaining
until NAV mode entry). When the
IRU is in NAV mode, the NDU
displays in the left display. When
the IRU is in altitude mode, the
NDU displays magnetic heading
in the left display and “ATT” in the
right.
FROM TO WPT
888888 8888888
GX_16_014
Left Display Right Display
For Training Purposes Only
Sept 04
16-13
P I LOT T R A I N I N G GU I D E
NAVIGATION
NDU UPDATE
To update the NDU (pre-flight), proceed as follows:
Power On
• Power the NDU on
Test
• Test the NDU displays, annunciators, and cue lights
SYSTEM SELECT FAULT
ON
FROM TO WPT
WPT
LEG
CHG
XTK
DTK
WD
WS
DIS
TIM
HDG
STS
POS
TK
GS
1
M
2 T
BRT
3 DIM
TST
ENT
BCK
0 CLR
7 S
8
9
W
4
5
E
6
1
N
2
3
88888
8 8
8 8888888
GX_16_015
Power the
NDU on.
Test the NDU
displays,
annunciators,
and cue lights.
FAULT ANNUNCIATOR
The NDU FAULT annunciator is
illuminated when the NDU BITE
detects internal failures.
FROM TO WPT
Three elements display the FROM and TO waypoint numbers
of the current leg and the number of the waypoint (WPT)
defined by the position being displayed
P I LOT T R A I N I N G GU I D E
NAVIGATION
16-14 For Training Purposes Only
Sept 04
POSITION ENTRY
The following procedures can be used for position entry (initialization) during IRU
alignment and align downmode.
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