MIL-PRF-49168C(CR)
3.2 Materials. The contractor shall select the materials, but the materials and parts used
shall be fully capable of meeting all of the operational and environmental requirements specified
herein. The materials specified in the applicable drawings are recommended, but are not
mandatory. Selection criteria of the class, grade or type part shall be that the material will be
able to perform its intended function when it is assembled. Verification of the supplier meeting
the overall performance requirements shall be the governing acceptance standard. Recovered
materials shall be used to the maximum extent possible.
3.3 Description. The Scan-Interlace PL-1403/UA and PL-1403A/UA, consists of a
printed wiring board (PWB) and circuitry to drive a mechanical scanner at 30Hz scan rate in low
power infrared systems. The two models differ in their internal configuration but are identical in
performance and external configuration. In system usage, they are, and must be, completely
interchangeable.
3.3.1 Design. The Scan-Interlace shall meet form, fit, function and interface requirements
as specified herein.
3.3.2 Weight. The weight of the Scan-Interlace shall be equal to or less than 0.26 pound
(4.16 ounces) when weighed with a balance or scale having an accuracy of 1% or better.
3.3.3 Dimensions. The Scan-Interlace Printed Wiring Board (PWB) shall be of appropriate
material with a nominal thickness of 0.062 inches and shall have dimensions of 3.02 inches x 3.48
inches, + 0.02 inches. When mounted, components shall not extend more than a maximum of
0.414 inches from the surface of the PWB. Two corners of the board on the 3.02 inch side away
from the two large connectors shall be trimmed at a 45o angle between two points 0.25 inches
vertical and horizontal of the corners, removing a triangle of board material 0.25 by 0.25 on either
side of the right angle (corner). The x-axis datum line shall be located parallel to the 3.48 inch
edge of the board and 0.125 inches above that edge, with the two large connectors above it. It
shall pass through the two 0.094 inch diameter holes located 0.125 inches above the edge and
0.290 inches and 3.190 inches in from the square edge. The y-axis datum line shall be located
0.290 inches in from the left-hand edge of the board. It shall pass through the two left-hand 0.094
inch diameter holes located 0.290 inches in from the left edge and shall be perpendicular to the x-
axis datum line. Four mounting holes 0.140 inches in diameter shall be located 0.025 inches and
2.750 inches above the x-axis datum line and 0.245 inches and 2.370 inches to the right of the y-
axis datum line as shown on Drawing SM-D-773949 or SM-D-657597. Two connectors shall be
attached to the non-component side of the board for the purpose of interfacing with existing
hardware. These connectors shall have the dimensions of Part Numbers SM-C-772278-3 and -4
as shown on Drawing SM-C-772278, while the third connector, which is on the component side
of the board, shall have the dimensions of Part Number SM-C-773501-2 as shown on Drawing
SM-C-773501. These connectors shall be located approximately as shown on Drawing SM-D-
773950 or SM-D-657598 for P1, P2 and J1. Two tip jacks shall also be attached to the
component side of the board. These tip jacks shall mount approximately where shown on
Drawing SM-D-773950 or SM-D-657598. The tip jacks shall
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