MIL-DTL-24560A(SH)
3.4.2.2 Thickness tolerances. Glassware shall be of uniform thickness
throughout. Where thickness tolerances are not specified (see 3.1), a
variation of l2 percent above or below the nominal dimensions will be
permitted, except that these tolerances shall in no case exceed l/16 inch.
3.4.2.3
Edges.
Edges of all glassware shall be ground or molded to a
true surface.
3.4.2.4 Fresnel type lens. The fresnel type lens of class l and 3
glassware shall have a central bulls eye with the required number of zones
above and below the central zone to meet the performance requirements
specified herein. Actual design as to the surface curvature, spacing of the
zones, width of the zones and so forth shall be at the option of the
manufacturer.
3.5
Performance characteristics.
3.5.1
Light assemblies.
3.5.1.1 Operation. Light assemblies, when operated as specified in
4.4.1.1, shall perform their specified function.
3.5.1.2 Degree of enclosure. Type I and type II light assemblies shall
conform to the splashproof and submersible (1600 foot) requirements,
respectively, of MIL-STD-108 (see 4.4.1.2). Following the enclosure test, the
assemblies shall satisfactorily pass the dielectric withstanding voltage and
insulation resistance tests (see 4.4.1.6 and 4.4.1.7).
3.5.1.3 Shock. Light assemblies shall conform to the class I or class
II (see 3.1), grade A shock requirements of MIL-S-901 (see 4.4.1.3).
Following the shock test, the light assemblies shall satisfactorily pass the
dielectric withstanding voltage test (see 4.4.1.6). Lamp failure shall not be
considered as an assembly failure.
3.5.1.4 Vibration. Light assemblies shall conform to the type I
vibration requirement of MIL-STD-167-l and shall exhibit no signs of damage or
loosening of parts during and after the vibration test (see 4.4.1.4).
Following the vibration test, the light assemblies shall satisfactorily pass
the dielectric withstanding voltage test (if applicable) (see 4.4.1.6).
3.5.1.5 Salt spray. There shall be no signs of excessive corrosion
when the 1ight assemblies are subjected to the salt spray test (see 4.4.1.5).
Excessive corrosion is defined as that which interferes with electrical or
mechanical performance, or in the case of plated metals corrosion which has
passed through the plating and attacked the base metal. Where corrosion
resistance treatments are used, it will be permissible to have limited
superficial corrosion such as would result from scratches.
3.5.1.6 Dielectric withstanding voltage. There shall be no evidence of
breakdown, arcing, corona (audible or visible), or punctured insulation when
the light assemblies are subjected to the test specified in 4.4.1.6.
3.5.1.7 Insulation resistance (wired assemblies). The insulation
resistance between all current carrying parts and non-current carrying parts
of the wired light assemblies (see 3.1) shall be not less than 100 megohms
when tested as specified in 4.4.1.7.
3.5.1.8 Hydrostatic pressure (type II). Type II light assembles shall
withstand the stresses produced when subjected to the hydrostatic pressure
specified (see 3.1) without visible or structural damage or evidence of
leakage of water into the enclosure (see 4.4.1.8).
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