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|  MIL-N-81604C(AS)
6.3 Precedence of Documents - When the requirements of the con-
tract, this specification, or applicable subsidiary specifica-
tions are in conflict, the following precedence shall apply:
Contract - The contract shall have precedence over
a.
any specification.
b.
This Specification - This specification shall have
precedence over all applicable subsidiary specifi-
cations. Any deviation from this specification, or
from subsidiary specifications where applicable,
shall be specifically approved in writing by the
procuring activity.
Reference Specifications - Any referenced speci-
c.
fication shall have precedence over all applicable
subsidiary specifications referenced therein. All
referenced specifications shall apply to the extent
specified.
6.4 Performance Objectives - Minimum size and weight, simplicity
of operation, ease of maintenance, and an improvement in the
performance and reliability of the specific functions beyond
the requirements of this specification are objectives which shall
be considered in the production of this equipment. Where it
appears a substantial reduction in size and weight or improve-
ment in simplicity of design, performance, ease of maintenance,
or reliability will result from the use of materials, parts, and
processes other than those specified in MIL-E-5400, it is desired
that their use be investigated. When investigation shows advan-
tages can be realized, a request for approval shall be submitted
to the procuring activity for consideration. Each request shall
be accompanied by complete supporting information.
6.5 Nonreparable Subassemblies - As a general rule, nonreparable *
subassemblies should be encapsulated or hermetically-sealed.
The number of connections internal to the subassembly should be
held to a minimum. Detail parts tolerances and rating should
be so selected that the life of the subassembly is greater than
that of a similar reparable one. With few exceptions (such as
high voltage power supplies), the nonreparable subassembly
.
should evidence a mean-time-to-failure greater than 5000 hours
and, for. many applications, this figure must be nearer 50,000
hours.
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