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|  MIL-D-70789A (AR)
3.8.5 Interchangeability. Assemblies, and parts shall be
interchangeable in accordance with Requirement 7 of MIL-STD-454.
3.8.6
Safety.
The DRU shall conform with Requirement 1 of MIL-STD-454.
3.8.6.1 Environmental safety. The DRU shall not produce nor
emit toxic by products capable of damaging the health of
operators or their environment.
3.8.6.2 Explosive atmosphere. The DRU shall preclude
ignition or explosion when operated in hazardous atmospheres.
3.8.7 Human Performance/human enqineerinq. The human
performance and human engineering design principles of MIL-STD-
1472; MIL-STD-1474, and MIL-H-46855 shall be applied to the DRU
in order to achieve simple and error free ease of operation and
maintenance. Areas requiring human factors engineering emphasis
include, but are not limited to, personnel safety and equipment
marking and nomenclatures.
3.8.8 Useful life. The DRU shall have a useful life of not
less than 15 years under any combination of operation and
storage.
3.9 Documentation. Documentation
shall
be
in
accordance
with contract provisions.
3.10
Built-in-test.
Ninety-Five percent of the total of
all malfunctions occurring in the DRU shall be detected and
indicated by Built-In-Test (BIT). A spurious BIT indication (BIT)
indication of malfunction when there is no actual malfunction)
shall be considered an undetected malfunction. The DRU shall not
falsely indicate a VMS malfunction if a VMS is not being used in
a particular configuration (3.5.8.8a).
3.10.1 Bit indications. Two BIT indicators (DS) shall be
provided on the DRU case as shown in Figure 7. DS-1 shall
indicate by a green display that the DRU is receiving proper
primary power. DS-2 shall indicate by a green display that the
DRU is operating correctly. The BIT indicators shall indicate a
failed condition by a black or non-illuminated display.
Additional BIT Information shall be provided via the serial data
buses as follows: Failure of the DRU or VMS shall be indicated
by setting bit 5 of STATUS character S2 and appropriate bits in
the BUILT-IN-TEST Data message. Illegal operations or invalid
input data shall be indicated by setting the appropriate ALERT
DATA bits and STATUS S2/1.
84
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