MIL-PRF-49157B
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
A3144480
-
Objective Lens Assembly, F/1.05
and all associated drawings
A3144481
-
Lens Cell Assembly, Objective, F/1.05
A3144482
-
Collar, Mounting, Objective Lens
(Copies of specification, 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 Description.
The Objective Lens Assembly is a part of the Night Vision
Goggles, AN/PVS-5( ).
3.1.1 First article test inspection. When specified in the contract or
purchase order, the contractor shall furnish assemblies for first article test
(FAT) inspection and approval (see 6.2.c).
3.2 Construction. The Objective Lens Assembly, referred to hereinafter as
the objective lens assembly, shall be constructed to comply with the performance
requirements in the contract, drawing A3144480 as applicable, and as specified
herein. The Objective Lens Cell Assembly, which is part of the objective lens
assembly and is referred to hereinafter as the cell assembly, shall be in
accordance with drawing A3144481 as applicable and as specified herein. The
Objective Lens Mounting Collar, which is part of the objective lens assembly and
is referred to hereinafter as the mounting collar, shall be in accordance with
drawing A3144482 as applicable and as specified herein.
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
objective lens assembly shall be 26.8 millimeters (mm) ± 0.4.
3.4.2 Flange focal distance. The flange focal distance of the objective
lens assembly shall be 0.2560 inch +.0010/-.0000 where the measurement is taken
from the side of the 1.763 inch mounting collar diameter closest to the focal
plane (see A3144480).
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