2. D. The LASERTRAK’”Navigation Display Unit (NDU) is a combined navigation
computer and display unit that can be used to initialize as many as three
global positioning inertial reference units (GPIRUS) and to display
navigation data based on a nine-waypoint flight plan and selected global
positioning inertial reference system (GPIRS) inputs.
The
NDU provides the following functions:
. Entry of position and heading for up to three inertial sensors.
● Entry of position for as many as nine waypoints.
● Selection of FROM TO leg.
● Display of selected ARINC 429 data from each inertial sensor.
. Position initialization.
. Self-test of front panel operation.
The NDU contains:
● Data entry keyboard
● Special function keyboard
● SYSTEM SELECT keyboard
● Data select keyboard
. Displays
. Fault annunciator
. ON/OFF switch
(1) Keyboards -
The NDU contains data entry, special function, SYSTEM
SELECT, and data select keyboards.
a.
Data Entry Keyboard
~ The data entry keyboard consists of 12-keys that are used to
enter, display, modify, or transmit initialization, leg
change, and flight plan data.
~ The
[ENT] key is used to accept entered data that is being
displayed on the data display.
The [CLR] key is used to
remove the entered data and clear the display. Both keys
contain green cue lights that indicate when operator action
is required.
~ The back key [0 BCK] is used to select the number and
position of the previous waypoint for display when the WPT
cue light is lit.
b. Special Function Keyboard
- The special function keyboard
consists of [M T], [BRT DIM], and
[TST] keys.
~
M T - The magnetic/true north key contains two green cue
lights that indicate north reference. When the M cue light
is lit, the NDU displays angular data referenced to magnetic
north.
When the T cue light is lit, the
NDU displays angular
data referenced to
true north.
22-14-00
Page 128.5
Apr 15/93
Use or disclosure of information on thispage issubject to the restrictionson the titlepage of thisdocument.
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