MIL-PRF-49319A(CR)
3.7 Reliability. The Detector-Dewar shall have a specified mean time between failure
(MTBF) of 27,600 hours.
3.8 Treatment and painting. Unless otherwise specified, the Detector-Dewar shall have an external
surface of a composition or surface treatment which will prevent rust, corrosion and fungus growth in the
full range of environmental requirements. External color and surface shine shall reduce light reflection
and reduce recognition. Surface treatment adherence must be assured through the full range of
environmental and use factors.
3.9 Preconditioning. Each Detector-Dewar shall be subjected to vibration and temperature
cycling prior to Group A testing as specified in Figure 2.
3.10 Nameplates and product marking. The Detector-Dewar module, parts, components,
subassemblies and assemblies thereof shall be marked for identification and reference designation
markings in accordance with View J on 80063-A3172178. Marking shall be positioned as shown
on 80063-A3172178.
3.11 Workmanship. All electronic parts, components, assemblies or sub-assemblies shall be
free of smudges, excess solder, metal chips or the existence of any foreign material on any surface.
Bearing assemblies shall be free from rust, dirt or tool marks. Wires or integrated circuits shall be
protected from contact with rough or irregular surfaces and be shielded from shorting.
3.12 Technical interpretations. The following technical interpretations are, when referenced
in sections 3, 4 or 5, mandatory for this specification.
3.12.1 Element. An element is defined as one channel in the array of elements in the
Detector-Dewar.
3.12.2 Defective element. A defective element shall be defined as an element which fails to
meet any one of the requirements of 3.5.5, 3.5.5.1, 3.5.6, 3.5.7 and 3.5.14.
3.12.3 Strapping. Strapping is defined as electrically connecting a defective element to a
nondefective element. The pair of strapped elements thus formed, exhibiting 100 percent crosstalk,
shall be considered as a single defect. Elements whose D* is less than 7.0 x 109 cm.Hz1/2w-1 shall
be opened prior to strapping.
3.12.4 Array axis. The array axis is defined as a line on the surface of the array passing
through the center of the projected geometrical areas of each element.
3.12.5 Optical axis. The Detector-Dewar's optical axis is defined as a line perpendicular to
the detector mounting plate that intersects the array axis at the midpoint of the array.
NOTE: One-half of the active detector elements are located on each side of the optical axis.
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