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MIL-W-85057(AS)
3.2 Parts and Materials.  In the selection of parts and materials,
fulfillment of major design objectives shall be the prime consideration.
In so doing, the following shall govern:
Microelectronic technology shall be considered and
(1)
microelectronic items shall conform to requirements
specified herein.
(2)
Other parts and materials requirements shall conform to
Specification MIL-E-5400.
Nonrepairable subassemblies shall be used in accordance
(3)
with Specification AR-10 and as outlined in Specification
MIL-E-5400.
(4)
When previously produced models of this equipment did not
use nonrepairable subassemblies, the design shall not be
changed to employ nonrepairable assemblies without the
approval of the procuring activity.
(5)
Transistors and diodes shall be chosen and applied l s
outlined in MIL-STD-454, Requirement 30, except JAN TX
grade shall be used.
3.2.1 Nonstandard Parts and Materials Approval . Approval for the use
of nonstandard parts and materials (including electron tubes, transistors
and diodes) other than microelectronic devices shall be obtained as outlined
in Specification MIL-E-5400.
3.2.2 Microelectronic Modular Assemblies. When used, Microelectronic
Modular Assemblies shall meet the requirements of Specification AR-5.
Conformal coatings, encapsulant, embedments or potting materials used with
modular assemblies containing integrated circuits and discrete parts shall
be easily removable without damage to the assembly.
3.3 Design and Construction. The equipment shall conform with all
the applicable requirements of Specification MIL-E-5400 for design,
construction and workmanship, except as otherwise specified herein.
3.3.1 Total Weight end Dimension.  The total weight of the-equipment,
excluding cables, shall be a minimum consistent with good design and shall
not exceed 46.5 pounds.  The dimensions of the digital computer (DC) and
computer converter-interface unit (CIU) shall be as specified on the following
drawings:
(1) DC:
3366010-500
(2) CIU:
3366011-500
3.3.2 Reliability.
The contractor shall conduct a reliability program
using MIL-STD-785.
-5-

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