2
D. (1) b. ~ BRT DIM - The bright/dim key is used
to control the lightning
of
the two DNU displays. When this key is first pressed and-
held, the display intensity increases until the brightest
level is reached. When this key is pressed and held a
second
time, the display intensity decreases until the dimmest level
is reached.
~ TST - The test key is used to start a test of all NDU
annunciators, cue lights, and displays.
c. SYSTEM SELECT Keyboard
~ The SYSTEM SELECT keyboard consists of the [1], [2], and [3]
keys that are used to select data for display from inertial
reference unit (IRU) 1, IRU 2, or IRU 3. Each key contains a
green cue light that lights when the data from that IRU has
been selected for computation and display. Since the NDU
displays data from one IRU at a time, only one cue light is
at
a time.
Unless otherwise indicated, IRU 3 refers to the IRU or
attitude/heading reference unit (AHRU) in the number 3
IRU position.
~ Some inertial reference systems (IRS) installations with the
LASERTRAK NDU may include only one or two IRU. If a SYSTEM
SELECT key is pressed and no IRU is present, the
NDU displays
dashes.
d.
Data Select Keyboard
~
The data select keyboard consists of eight keys that are used
to select data for display.
Each key contains a cue light
that when lit indicates what type of data has been selected
for display. 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. If data
is selected for
display from an attitude-heading reference unit (AHRU), the
NDU displays
only heading and status. Data select keys are
described below.
~ WPT - The waypoint key is used to build and display a flight
plan consisting of one to nine waypoints. When this key is
repeatedly pressed, the NDU displays the successive flight
plan waypoints by number and position.
~ LEG CHG - 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.
22-14-00
Page 128.6
Apr 15/93
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