MIL-DTL-62740A(AT)
3.5 Ownership and support requirements.
3.5.1 Interchangeability. Interchangeability tolerances should permit parts, subassemblies
and assemblies to be used in their parent assemblies without regard to the source of supply or
manufacturer. Parts, subassemblies and assemblies having the full range of dimensions and
characteristics permitted by the specification governing the part, subassembly or assembly should
be usable as replacement items without selection and without departure from the specified
performance guidelines of the parent items.
3.5.2 Identification marking. Unless otherwise specified (see 6.2), identification marking
shall be permanent and legible and shall include as a minimum the following:
a.
Nomenclature "PRINTED WIRING ASSEMBLY, SPECIAL CIRCUITS".
b.
Military part number.
c.
Manufacturer's CAGE code and name.
d.
Manufacturer's serial numbers.
e.
Contract number.
f.
Symbol "US".
3.6 Operating environment requirements. Each PWA shall operate under the following
environmental conditions without damage or loss of performance.
3.6.1 Temperature.
3.6.1.1 High temperature (operating). The PWA shall be capable of operation without
damage or malfunction at a high temperature of +125°F (52°C) (without solar radiation).
3.6.1.2 Low temperature (operating). The PWA shall be capable of operation without
damage or malfunction at a low temperature of +20°F (-7°C). For ambient temperatures below
+20°F (-7°C), the test set shall be operated in a shelter.
3.6.1.3 High temperature (nonoperating). The PWA shall be capable of being stored and
transported in its case without damage at an ambient temperature of +160°F (71°C).
3.6.1.4 Low temperature (nonoperating). The PWA shall be capable of being stored and
transported in its case without damage in ambient temperatures of -60°F (-51°C).
3.6.2 Fungus. All nonmetallic materials that are not inherently fungistatic shall function in
a fungus environment without adversely affecting the operation/performance of the PWA.
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