MIL-PRF-49156B
2.1.1 Reference documents, drawings, and publications. The following
other Government documents, drawings, and publications form a part of this
document to the extent specified herein. Unless otherwise specified, the issues
are those cited in the solicitation (see 6.2.b).
DRAWINGS
USA COMMUNICATIONS-ELECTRONICS COMMAND
SM-C-804193
-
Eyepiece Assembly
and all associated drawings
SM-D-804194
-
Adapter, Eyepiece
SM-D-804195
-
Cell Assembly-Eyepiece
(Copies of specifications, standards, drawings, and publications required by
contractors in connection with specific procurement functions should be obtained
from the procuring activity or as directed by the contracting officer.)
2.2 Order of precedence. In the event of a conflict between the text of
this document and the references cited herein, the text of this document takes
precedence. Nothing in this document, however, supersedes applicable laws and
regulations unless a specific exemption has been obtained.
3.
REQUIREMENTS
3.1 Construction. The Eyepiece Assembly, referred to hereinafter as the
eyepiece assembly, shall be constructed to comply with the performance
requirements in the contract, drawing SM-C-804193 as applicable, and as specified
herein. The Eyepiece Cell Assembly, which is part of the eyepiece assembly and
is referred to hereinafter as the cell assembly, shall be in accordance with
drawing SM-D-804195-1 (glass) as applicable and as specified herein. The
Eyepiece Adapter, which is part of the eyepiece assembly and is referred to
hereinafter as the adapter, shall be in accordance with drawing SM-D-804194 as
applicable and as specified herein.
3.2 First article test inspection. When specified in the contract or
purchase order, the contractor shall furnish eyepiece assemblies for first
article test (FAT) inspection and approval(see 6.2.c).
3.3 Parts and materials. The contractor shall select parts and materials
fully capable of meeting all operational and environmental requirements specified
herein. The materials specified on the applicable drawings are recommended, but
not mandatory. Verification that the assembly meets the overall performance
requirements shall be the governing acceptance standard.
3.4
Performance characteristics.
3.4.1 Equivalent focal length. The equivalent focal length of the
eyepiece assembly shall be 27.0 millimeters (mm) ± 0.3.
3.4.2 Flange focal distance. The flange focal distance of the cell
assembly shall be 0.410 inch ± 0.020 where the measurement is taken from the side
of the 1.5490 inch cell assembly diameter closest to the focal plane (see SM-D-
804195).
3.4.3
Concentricity.
3.4.3.1 Cell assembly concentricity. The concentricity of the optical
axis and the mechanical axis associated with the 1.243 inch diameter shall be as
specified on cell assembly drawing SM-D-804195.
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