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waypoints by number and position.
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.
The crosstrack/desired track key is used to select and display the crosstrack error in
nautical miles from the current leg and the desired track of that leg.
The distance/time key is used to select and display the distance and time to the TO
waypoint based upon present position and current ground speed.
The track/ground speed key is used to select and display the current track and ground
speed.
The position key is used to initialize and display the present position of the airplane.
The wind direction/wind speed key is used to select and display the current wind direction
and wind speed.
NAVIGATION
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NAVIGATION DISPLAY UNIT (IF INSTALLED) (CONT'D)
Data Select Keyboard (Cont’d)
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 heading in the left display. When the IRU is in attitude
mode, the NDU displays magnetic heading in the left display and “ATT” in the right.
LEFT DISPLAY RIGHT DISPLAY
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.
The FROM TO WPT display has three elements that display the FROM and TO waypoint numbers
of the current leg and the number of the waypoint defined by the position being displayed.
GF1710_167
Fault Annunciator
The NDU FAULT annunciator is illuminated when the NDU BITE detects internal failures.
NAVIGATION
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NDU UPDATE
To update the NDU (preflight),
proceed as follows:
Power On
· Power the NDU on.
GF1710_169
Test
· Test the NDU displays, annunciators and cue lights. GF1710_170
NAVIGATION
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NDU UPDATE (CONT'D)
Position Entry
The following procedures can be used for position entry (initialization), during IRS alignment and
align downmode.
GF1710_171
1 Press POS key.
2 Press N/2 or S/8.
3 Enter Latitude (example KICT).
4 Press ENT key to transmit lattitude to all IRUs.
6 Enter Longitude (example KICT).
5 Press W/4 or E/6.
7 Press ENT key to transmit longitude to all IRUs.
8 Press HDG STS key and observe time to complete alignment in right display.
NAVIGATION
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NDU UPDATE (CONT'D)
Position Entry (Cont’d)
Enter the magnetic heading when the latitude mode has been selected.
GF1710_172
1 Press appropriate SYSTEM SELECT key.
2 Press HDG STS.
3 Enter magnetic heading (example KICT).
4 Press ENT key to transmit heading to all IRUs.
Ensure IRS mode selector is set to ATT.
NOTE
For more information, refer to the LASERTRACK Navigation Display Unit Pilot’s Manual
IRS1 IRS2 IRS3
NAVIGATION
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NDU SCHEMATIC
GF1710_173
IAC 1 IAC 2 IAC 3
IRU 1 IRU 2 IRU 3
NAVIGATION
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GLOBAL POSITIONING SYSTEM (GPS)
The GPS is used to determine airplane position and provides supplementary information to FMS and
EGPWS. The GPS calculates the latitude, longitude, altitude, accurate time, date, true heading and
ground speed.
The Global Navigation System Sensor Unit (GNSSU), is a GPS receiver that receives satellite
signals from the NAVSTAR GPS satellite constellation (21 operational satellites and 3 active spares)
and uses the satellite data to compute the airplane position.
The GNSSU has a Receiver Autonomous Integrity Monitor (RAIM) function. The RAIM monitors the
status of the satellites that are used for calculations. The output of the RAIM function is an estimate
of GPS position error. The RAIM value is sent to the FMS and the FMS uses this data to determine if
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