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|  MIL-N-81604C(AS)
3.5.4.8 Mechanical Design
Weight - The ANCU weight shall be no greater
a.
than 36.8 pounds with a 12K memory or 32.8
pounds with an 8K memory.
*
Size - The ANCU shall conform to the outline
b.
and mounting drawing shown in figure 27.
*
Cooling - Figures 28 and 29 indicate the
c.
minimum cooling required and the pressure
drop of the ANCU.
Installation - Shock mounts are required for
d.
environment in excess of 2g vibration and/or
5g shock. The shock mounts shall meet the
*
requirements of MIL-C-172 (refer to 3.5.6).
3.5.5 Control Indicator Unit (CIU)
3.5.5.1 Function - The CIU shall provide the means to control
and/or observe the operating mode of the equipment; to select
desired navigation functions for display; and to enter or modify
data. The CIU shall meet the requirements of MIL-C-6781. See
*
figure 30 for a suggested front panel layout.
3.5.5.2 Mode Selection - The CIU front panel shall contain a
MODE switch which will allow the operator to select the equip-
*
(Refer to 3.4.1.1). Except for the OFF
ment mode of operation.
position, each position shall be assigned to a bit in the Com-
*
(Refer to 3.4.4.4 and table XIV.)
mand Word.
3.5.5.3 Displays - In order to observe the various required
*
variables (table XXI), the CIU front panel shall contain two
*
separated displays (see figure 30); a left display and a right
*
display. The left display shall be capable of displaying five
digits and an N or an S. The right display shall be capable of
*
displaying six digits and an E or a W. The data to appear on the
*
readouts shall be contained in the display words (table XII).
Sign and punctuation of the data shall be under control of the
*
status word (table XI). The frequency of transmission of the
display words is dependent upon the computer program (refer to
*
3.5.4.5). However, the selected words shall be updated no less
than once every two seconds.
3.5.5.4 Entry/Display Selection - The DATA switch shall allow
selection of the variable to be entered or displayed in the left
and right displays. The required selectable variables, with
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