Honeywell SPZ-8000 Maintenance Manual page 110

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
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