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|  MIL-C-81360(AS)
(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 pro-
curing activity.
3.2.1
Nonstandard Parts and Materials Approval - Approval for the use of
nonstandard parts and materials (including transistors and diodes) shall be obtained as
outllned in Specification MIL-E-5400.
Design and Construction - The equipment shall conform with all the
3,3
applicable requirements of Specification MIL-E-5400 for design, construction and workman-
ship, except as otherwise specified herein.
3.3.1
Total Weight - The total weight of the equipment, excluding cables, shall
be a minimum consistent with good design and shall not exceed 22 ounces.
3.3.2
Reliability -
Operational Stability - The equipment shall operate with satisfactory
3.3.2.1
performance, continuously or Intermittently for a period of at least 1,000 hours without
the necessity for readjustment of any controls which are inaccessible to the operator during
normal use.
Operating Life - The equipment shall have total operating life of 10,000
3.3.2.2
hours with reasonable servicing and replacement of parts. Parts requiring scheduled re-
placement shall be specified by the contractor.
Reliability in Mean Time Between Failure (MTBF) - The equipment shall
3.3.2.3
have 2,000 hours of mean (operating) time between failures when tested and accepted as
outlined under the requirements of 4.4.3.
3.3.3
Cabling and Connections -
Cables and Connectors - The equipment shall provide for the use of
3.3.3.1
cables and connectors in accordance with Specification MIL-E-5400.
Control Panels - All rack or console mounted control panels shall con-
3.3.4
form to the applicable requirements of Specification MIL-C-6781. The configuration of all
control panels must be approved by the procuring activity prior to preproduction testing.
Interchangability of Reordered Equipment - For reordered equipment
3.3.5
interchangeability shall exist between units and all replaceable assemblies, subassemblies,
and parts of a designated model of any previously manufactured equipment, supplied or
designated by the procuring activity.
Interference Control - The generation of radio interference by the equip-
3.3.6
ment and the vulnerability of the equipment to radio interference shall be controlled within
the limits of Specification MIL-I-6181.
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