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Nonstandard Parts and Materials Approval |
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|  MIL-N-81604C(AS)
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 MIL-E-5400. Microelectronic
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devices shall be approved as outlined in AR-5.
3.2.2 Microelectronic Modular Assemblies - When used, micro-
electronic modular assemblies shall meet the requirements of
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AR-5. Conformal coatings, encapsulant, embedments, or potting
materials used with modular assemblies (designated as reparable)
containing integrated circuits and discrete parts shall be
easily removable without damage to the assembly.
3.2.3 Modules - The electronic portions of the equipment shall
be functionally modularized in accordance with AR-10 when prac-
ticable. When previously produced models of this equipment do
not incorporate AR-10, the design shall not be changed to incor-
porate AR-10 without the approval of the procuring activity.
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3.3 Design and Constrction - The equipment shall conform with
all applicable requirements of MIL-E-5400 for design, construc-
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tion, and workmanship, except as otherwise specified herein.
3.3.1 Total Weight. - The total weight of the equipment, excluding
cables, the CAU, and the CAU mount, shall be a minimum consistent
With good design and shall not exceed 103.6 pounds with 12K words
of computer memory. For the maximum WRA weights, refer to 3.5.
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For CAU weight, refer to Appendix I.
3.3.2 Reliability - A Reliability Plan shall be provided in accordance withl
MIL-STD-785.
3.3.2.1 Operational Stability - The equipment shall operate with
satisfactory performance continuously or intermittently for a
period of at least 700 hours without the necessity for readjust-
ment of any control other than that required to initiate an
equipment recalibration sequence. The equipment shall not re-
guire calibrator, more frequently than every 300 operational
hours to meet the equipment performance requirements specified
herein. Shipboard recalibration shall be performed with equip-
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ment designed in accordance with XAS-1233, or equivalent.
3.3.2.2 Operating Life. - The equipment shall have a total
operating life of 10,000 hours with reasonable servicing and
replacement of parts. Parts requiring scheduled replacement
shall be specified by the contractor and approved by the pro-
curing activity before use in the equipment design.
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