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|  MIL-D-70789A
(AR)
3.8 Design and construction.
3.8.1 Materials, processes, and parts. Materials, processes
and parts shall be selected in accordance with MIL-P-11268.
3.8.1.1
Elapsed time indicator. The elasped time meter
shall be in accordance with Requirement 51 of MIL-STD-454 and
MIL-M-7793.
3.8.1.2 Treatment and Paintinq. All surfaces of the DRU
shall be cleaned and treated as specified in MIL-F-14072. The
exterior surfaces shall be painted Green 383 with chemical agent
resistant liphatic, polyurethane paint In accordance With
MIL-C-46168. Selection and protection of dissimilar metal
combinations shall be in accordance with MIL-F-14072.
3.8.1.3
Marking and identification. The name plate shall be
in accordance with Figure 20. Other required marking shall
conform to MIL-STD-130 and Requirement 67 of MIL-STD-454.
3.8.1.4
Grounding. Ground connection to the chassis and to
other mechanical parts shall not be made to complete,electrical
circuits, but only to eliminate high-potential AC points. The
DRU shall be designed so that a DC power return circuit cannot be
completed through the DRU chassis to a grounded vehicle chassis.
3.8.2
Nuclear Survivability. The DRU shall not be damaged
after exposure to the nuclear environment as specified in
"Nuclear Survivability Criteria for the Modular Azimuth Position.
System (MAPS) equipment survivability category: man in truck or
signal shelter, equipment exposed. The DRU is permitted to
turn off, without damage, when exposed to nuclear events. After
such a shutdown, the DRU shall not turn on until power has been
disconnected and reapplied and when reinitialized shall perform
as specified in 3.5.3.1.1.2 (Abnormal Shutdown). The position
update shall not use stored data. Design margins shall be in
accordance with the following:
80
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