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MIL-S-70442(AR)
The combiner glass shall
q
3.4.2.7 Reflector/combiner plate.
conform to MIL-O-13830.
3.4.2.8 Symbol color.  To accommodate night operation without
the AN/PVS-5 night vision goggles, it is desired that the symbols
displayed on the HUD shall be red in color in accordance with
MIL-L-25467.
The HUDS shall have a self-test
3.4.2.9 Diagnostics.
capability.
3.4.2.10 Built-in-test-equipment (BITE).
3.4.2.10.1 Fault detection/location.  The HUDS shall have a
built-in-test (BIT) capability to check the operational status of
the equipment.
3.4.2.10.2 BITE output.  The BITE provisions shall also provide
for driving a remote indicator.  This output shall be such that a
signal of 28 vdc indicates a "go" condition, and an open signal
indicates a "no-go" condition.
An
equipment  status
3.4.2.10.3 Malfunction indication.
The  equipment  status
indicator
shall
be
provided  for  each  LRU.
shall be such as to
a "go"?"no-go"  device and
indicator
shall
be
hold the last result if power is interrupted or removed, and shall
be located on the surface of the LRU.  Bite initiation and
repetition shall be automatic and independent of pilot inputs.
3.4.2.11 Range data interface.  Two sources of range data shall
be accepted by the HUDS for the display of digital range data.
These two sources shall be as follows:
Fire Control Computer Range
a.
Laser Range
b.
3.4.2.11.1 Range display precedence.  Range shall be displayed
from one of two sources, with the following priority, respectively:
FCC Range - Displayed when a valid FCC GOOD discrete is
present at the HUD interface.
b.  Laser Range - Displayed when a false FCC GOOD discrete is
present at the HUDS interface and a valid laser range word in
available at the HUDS interface.
25

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